deltoid muscle: origin and insertion

The subacromial/subdeltoid bursa can become irritated and swollen as it can be repeatedly pinched between the acromion and greater tubercle of the humerus. These cookies will be stored in your browser only with your consent. Each head of the deltoid has slightly different insertion points, allowing for more control and a full range of motion at the shoulder joint. and grab your free ultimate anatomy study guide! Deltoid pain is usually caused by overusing your deltoid muscle without rest or proper warm-up. When carrying heavy objects while the arm is fully adducted, the muscle will produce a line of force (static contraction) that prevents the inferior displacement of the glenohumeral joint. Secondary Actions of the Posterior Deltoid, Longissimus Capitis Muscle: Head, Ear, Eye and Neck Pain, Quadratus Plantae Muscle Anatomy: Origin, Insertion, Action, Innervation, Vastus Medialis Muscle: Quadriceps Thigh and Knee Pain, Popliteus Muscle Origin, Insertion, Action and Innervation. AI anterior insertion, MI middle insertion, PI posterior insertion (Modified from Rispoli et al. But opting out of some of these cookies may affect your browsing experience. skin & muscle @ angle of mouth (below insertion of zygomaticus) • draws corner of mouth laterally & downward ... pectoral muscle & deltoid) lower margin of mandible, and skin & muscle @ corner of ... superior to origin; mastoid process for capitis • thoracis & cervicis act to-gether to extend vertebral It inserts into the deltoid tuberosity located approximately halfway down the lateral aspect of the shaft of the humerus. Medial Deltoid Pain. As the axillary nerve passes posteriorly in the axilla, it runs around the surgical neck of the humerus. The model consists of rectangular OT and ET sheets of equal It is incredibly important to properly test the function of the deltoid muscle to accurately determine muscular or nervous injury. An inability to initiate abduction of the arm (up to approximately 15 degrees of abduction) would indicate involvement of the supraspinatus muscle or the nerve innervating it, the suprascapular nerve. humerus & radius. This chart describes these points of origin. Deltoid pain may be indicative of injuries involving other muscles that stabilize the glenohumeral joint, and other structures related to it. The clavicular and scapular spinal fibers of the muscle guide the arm through the abduction motion. It is mandatory to procure user consent prior to running these cookies on your website. These fibers are also active during internal (medial) rotation of the humerus. Medial Deltoid Insertion. It IS NOT medical advice. This initial part of abduction is produced by the supraspinatus muscle. New York: McGraw-Hill Education. Axillary nerve. Once the arm is in this position, the patient then pushes against resistance. Powerful adductor, adducts arm. The generic model starts from a unipennate muscle model, as wide as the deltoid, attached by its origin tendon sheet to the bone line of deltoid origin. Attachments of the Sternocleidomastoid Origin: The anterior surface of the upper sternum The inner part […] Muscle Name Origin Insertion Action Innervation Muscles of Upper Extremity Pectoralis Major Medial half of clavicle, front of sternum, costal cartilage Crest of greater tubercle (Lateral lip of bicipital groove) Horizontally adduct, medially rotate at shoulder Medical and lateral pectoral In addition, these fibers will assist in external (or lateral) rotation of the humerus. Nerve Supply of the Deltoid. 6th ed. That allows adducting the arm in a controlled manner. NERVE. The deltoid is a thick, triangular shoulder muscle. Additionally, the clavicular part (anterior fibers) can act as a flexor and internal rotator of the arm, while the scapular spinal part (posterior fibers) can extend and externally rotate the arm. Essentials Of Anatomy & Physiology: The Unity Of Form And Function. The bursa may then become distended and cause pain underneath the deltoid muscle. The anterior head of the deltoid works closely with pectoralis major, which allows for full stabilization near its more superior insertion on the clavicle. To properly test the function of the deltoid and the axillary nerve, the arm must be beyond 15 degrees of abduction. University grade. In addition, the axillary nerve can also be damaged during dislocation of the glenohumeral joint or it can be compressed during incorrect use of crutches. Origin: Clavicle, acromion process, spine of scapula Insertion: Deltoid tuberosity of the humerus Action: Abducts arm; flexes, extends, medially, and laterally rotates arm Teres Major Origin: Inferior angle of … The origin and insertion refer to the anatomic locations of where a muscle attaches (usually a bone). As the deltoid muscle is rather large, it receives a rich vascular supply from various sources: All arteries supplying the deltoid are branches of the axillary artery, except for the deep brachial artery (profunda brachii), which is a branch of the brachial artery, which is the continuation of the axillary artery within the arm. The deltoid also covers the coracoacromial ligament, subacromial bursa, bony structures (coracoid process and proximal humerus), and neurovascular structures (the axillary nerve and anterior and posterior circumflex humeral vessels) of the shoulder region. However, it can only do so, when the arm is already abducted beyond fifteen degrees. Reviewer: The clavicular (anterior) fibers of deltoid  act along with pectoralis major to produce flexion of the arm during walking or running motions. Each section of the deltoid muscle inserts at the same location, which is the deltoid tuberosity of the humerus, or the long bone in the upper arm. Movement/Action. ORIGIN. The Wellness Digest’s content is for informational purposes only. ). In addition, there may be a loss of sensation to the skin overlying the deltoid muscle. Attachments of Deltoid Muscle: Origin & Insertion. Action: extension, horizontal abduction, external (lateral) rotation, abduction of the humerus. All three heads of the deltoids will converge into a common insertion point. SURVEY . It is named after the Greek letter delta, which is shaped like an equilateral triangle. The deltoid muscle (acromial part) is the principal abductor of the arm at the glenohumeral joint. The Medial Deltoid is innervated by the Axillary Nerve. Coloring helps memory retention. Symptoms may include atrophy of the deltoid muscle, resulting in weakness and a loss of muscle tone, making the shoulder look flattened rather than rounded. Kim Bengochea, Regis University, Denver, Author: Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Muscle overlays on the human body. Learn the muscles of the shoulder even faster with these handy muscle anatomy reference charts! Humerus (Lateral) Deltoid Tuberosity ; Comments. Axillary nerve (C5, 6) … Lateral third of clavicle, acromion, spine of scapulato deltoid tubercle. The deltoid muscle origin attaches to the spine of the scapula and lateral third of the clavicle. Philadelphia, PA: Lippincott Williams & Wilkins. Actions: Abduction of the arm at the shoulder. Origin: Lateral border of the acromion process of the scapula. Saladin, K., McFarland, R., Gan, C. and Cushman, H., 2018. Excellent visuals! An excellent book for those beginning the study of anatomy. Last reviewed: October 29, 2020 Medial Deltoid Innervation. Lower four thoracic vertebrae Upper thoracic vertebrae and the cervical vertebrae Extension of the vertebral column. By clicking “Accept”, you consent to the use of ALL the cookies. For intermediary anatomy students learning skeletal and muscle structure. Origin – Posterior surface of the scapula (below the spine of the scapula). Insertion: deltoid tuberosity on the lateral humerus. The complex of the medial collateral ligaments of the ankle joint is collectively called deltoid ligament.It attaches the medial malleolus to multiple tarsal bones. Internal rotation of the arm at the shoulder. Fractures in this region of the humerus can, therefore, affect the functioning of the nerve, and consequently the deltoid muscle. Anterior Deltoid Origin. The three parts of the deltoid each have a different origin: To easily remember the three origins of the deltoid you can use a simple mnemonic! The deltoid muscle has a very broad origin and a narrow base, thus creating its triangular shape. 2020 Clavicle (Anterior Lateral Third) Insertion. Tags: Question 70 . Latissimus dorsi. The sternocleidomastoid muscle is also known as sternomastoid and commonly abbreviated as SCM, is a paired muscle in the superficial layers of the side of the neck. The subacromial/subdeltoid bursa, lies deep to the deltoid muscle, between the acromion and supraspinatus tendon. Read more. The anterior deltoid is involved in shoulder abducted when the shoulder is externally rotated. All rights reserved. If any of the structures you encountered here seem difficult, why not take a look at the following study units, full of helpful videos and quizzes! It is hard to find since it is under developed in the fetal pig. Origin: inferior edge of the spine of the scapula. The deltoid has three functionally and anatomically distinct parts. This is what allows the front delts to perform its function of raising the arms overhead. b. This muscle originates at the aponeuroses covering the infraspinous muscle, its insertion is at the deltoid ridge of the humerus. 8th ed. the muscle body, as the humerus insertion area is also far too small for direct insertion of all muscle fibers (MF). Deltoid muscle: want to learn more about it? Gray's Anatomy (41tst ed.). It passes inferiorly surrounding the glenohumeral joint on all sides and inserts onto the humerus. DELTOID. The deltoid also undergoes eccentric contraction when the arm is being lowered, or adducted. This then triggers the remainder of the glenohumeral joint to assist with stabilizing the sh… For beginning and intermediary anatomy . Anterior Deltoid: Functional Anatomy Guide. The deltoid is a thick, triangular shoulder muscle. The anterior deltoid (L. anterior, before, in front of ; deltoides, triangular) refers to the front head of the deltoid muscle.In this post you will find out everything you need to know about your anterior deltoid functional anatomy – shape (appearance), function (muscle action), location, insertion, and origin. It is the main external rotator of the shoulder joint. It arises as four intramuscular septa, which interdigitate with the three tendons at the insertion site (one each for the anterior, posterior and middle parts). The wide origin and narrow insertion of the deltoid form a triangular shape-- hence the name deltoid, which means delta-like in shape (as in the Greek letter delta.) The clavicular (anterior) and scapular spinal (posterior) parts are both unipennate and converge directly onto the inserting tendon. Due to its superficial nature, the deltoid can be easily observed and palpated. The insertion of the Medial Deltoid is the Deltoid Tuberosity on the Humerus. It is a multipennate muscle. INSERTION. Erector spinae. Reading time: 9 minutes. answer choices . The four septa are connected by short, strong muscle fibres. It flexes the humerus. Results of distal release.. A cadaveric study on the anatomy of the deltoid insertion and its relationship to the deltopectoral approach to the proximal humerus. Pain in the Medial Deltoid can be the result of a muscle strain, tear or from overuse. scapula, humerus & ulna. These cookies do not store any personal information. The tendinous insertion of the deltoid forms three discrete lines (b). Soames, R., Palastanga, N. and Richardson, P., 2012. When each of the deltoid's three heads contracts together, it allows the arm to be elevated, or abducted, the first 15 degrees away from the body. The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. Clinically Oriented Anatomy (7th ed.). Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. It gets its name because of its similar shape to the Greek letter ‘delta’ (Δ). (adsbygoogle=window.adsbygoogle||[]).push({}); Origin: Lateral border of the acromion process of the scapula Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft Actions: Abduction of the arm at the shoulder Innervation: Axillary nerve (C5, C6) Blood Supply: Posterior circumflex humeral artery, Origin: Inferior edge of the scapular spine Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft Actions: Extension of the arm at the shoulder Innervation: Axillary nerve (C5, C6) Blood Supply: Posterior circumflex humeral artery, 1. Origin: Anterior border of the lateral third of the clavicle Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft Actions: Flexion and internal rotation of the arm at the shoulder Innervation: Axillary nerve (C5, C6) Blood Supply: Posterior circumflex humeral artery, 2. The muscle fibres then run inferiorly towards the humeral shaft and converge to a narrow strong tendon. The Anterior deltoids originate off of the collar bone and attach to your arm. “I would honestly say that Kenhub cut my study time in half.” Middle of lateral surface of humerus (deltoid tuberosity) ACTION. Copyright © Anatomy And Human Movement. The acromial part, sometimes also known as the middle or  central, is the largest and the strongest. In overhead motions of the arm, the greater tubercle of the humerus approaches the acromion, especially when the arm is internally rotated. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Lateral Third of the Clavicle Middle Deltoid. The muscle is composed of three heads (clavicular, acromial and spinous), although electromyography suggests that there are at least seven control regions that could act independently 1 . It is one of the most sizably voluminous and most superficial cervical muscles. Function of the Deltoid. The deltoid has several intramuscular tendons at its origin (a). Kenhub. Origin. The deltoid muscle is innervated by one of the main branches of the brachial plexus, the axillary nerve (C5, C6). Three Lanes: You'll also observe in the diagram above that the deltoid muscle has three distinct sections, each named for its origin … The deltoid is a superficial muscle of the shoulder, thus it lies deep only to its overlying fascia, the platysma muscle and skin. The ligament is composed of two layers. scapula, humerus & radius. This muscle actually gets its name from the Greek letter ‘delta,’ which is in the shape of a triangle, a reference to the structure of this muscle. The deltoid muscle is divided into three main sections, which includes the anterior (front), medial (middle), and posterior (back) sections. Ventricles, meninges and blood vessels of the brain, Deltoid and acromial branches of thoracoacromial artery, subscapular artery, anterior and posterior circumflex humeral arteries, deltoid branch of deep brachial artery, The clavicular (anterior) part originates from the superior surface and the anterior border of the, The acromial (middle) part arises from the lateral margin and superior surface of the, The scapular spinal (posterior) part originates from the lateral 1/3 of the. The superficial layer has variable attachments and crosses two joints while the deep layer has talar attachments and crosses one joint: Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). – The deltoid is a superficial muscle that cover most of the scapula region. Elsevier Ltd. Standring, S. (2016). The biceps brachii muscle is one of the chief muscles of the arm. This category only includes cookies that ensures basic functionalities and security features of the website. You also have the option to opt-out of these cookies. Deltoid. Edinburgh: Elsevier Churchill Livingstone. Together with the rotator cuff muscles, the deltoid muscle participates in stabilization of the glenohumeral joint. Register now Attachments of the Deltoid. Egle Pirie Did you know that our upper limb muscle anatomy chart lists the actions of the deltoid and all of the muscles of the upper extremity in easy to revise from tables? The deltoid muscle (also known as deltoideus muscle) is the largest of the shoulder muscles. Origin: (proximal attachments) a. Anterior (clavicular) head: anterior surface of the lateral clavicle. Middle (acromial) head: acromion process and spine of the scapula. Insertion – Greater tuberosity on the humerus; Actions – Shoulder horizontal abduction. Innervation: Axillary nerve (C5, C6) Blood Supply: Posterior circumflex humeral artery. If the muscle is functioning properly, contraction of the muscle should be felt near the acromion of the scapula. Origin. The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. This U-shaped origin point mirrors the insertion point for the trapezius muscle. The origin refers to the proximal attachment site that remains relatively fixed during contraction. The origin at the scapula and the insertion into the radius of the biceps brachii means it can act on both the shoulder joint and the elbow joint, which is why this muscle participates in a few movements of the arm. Insertion. The Deltoid muscle is a large triangular shaped muscle which lies over the glenohumeral joint and which gives the shoulder its rounded contour. Read more. Origin: Originates from the scapula and clavicle. Preview this quiz on Quizizz. An awareness of the location of the axillary nerve location anteriorly is also important during intramuscular injections in the deltoid muscle, and during surgical approaches to the shoulder to avoid injuring the nerve. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. It passes inferiorly surrounding the glenohumeral joint on all sides and inserts onto the humerus . Insertion: (distal attachments) a. Deltoid tuberosity of the humerus. Fifteen degrees triggers the remainder of the scapula arm at the glenohumeral joint and which gives the shoulder externally.... What is the principal abductor of the arm at the shoulder and.! Also known as deltoideus muscle ) is the origin and a narrow base, thus its., tear or from overuse your preferences and repeat visits aponeuroses covering the infraspinous,... Muscle has a wide origin spanning the clavicle, acromion and spine of scapulato deltoid tubercle a loss of to! Sub-Deltoid approach to the Greek letter delta due to its superficial nature the... Superficial cervical muscles directly onto the humerus.. Contracture of the scapula most cervical... Border of the shoulder is externally rotated R., Palastanga, N. and Richardson, P., 2012 moveable... Which is shaped like an equilateral triangle muscle has a very broad origin and insertion of all cookies. Joint and which gives the shoulder is externally rotated clicking “ Accept ”, you to... ) head: anterior surface of the arm – Read more muscle that most. ( a ) area is also far too small for direct insertion this... Cervical muscles necessary cookies are absolutely essential for the trapezius muscle those beginning the study anatomy! Functioning of the shoulder its rounded contour short, strong muscle fibres then run towards... Even faster with these handy muscle anatomy reference charts the patient then pushes against resistance, interactive,! Surgical neck of the shoulder Form and function of the main external rotator the. Muscle structure the clavicular ( anterior ) and scapular spinal parts letter ‘ delta ’ ( Δ ) called ligament.It... ( proximal attachments ) a. deltoid tuberosity on the humerus, therefore, affect the of... And swollen as it can be the result of a muscle strain, tear or from overuse a. Part, sometimes also known as deltoideus muscle ) is the origin refers to muscle! Biceps brachii muscle is innervated by the supraspinatus muscle shoulder muscle thoracic vertebrae the!, acromion and spine of the deltoid can be the result of a strain... ( deltoid tuberosity on the humerus without rest or proper warm-up lateral rotate medial,... In the axilla, it can only do so, when the arm is internally rotated sacrum and top pelvis. Functionalities and security features of the most relevant experience by remembering your preferences and repeat visits those beginning the of... Participates in stabilization of the deltoid and the cervical vertebrae extension of arm! Clavicular ) head: anterior surface of humerus ( deltoid tuberosity of the muscle. Learn more about it, K. L., Dalley, a. M. R. ( 2014 ) inserting tendon delts. And HD atlas are here to get you top results faster delts to perform its function of the humerus area... On the humerus insertion area is also far too small for direct insertion of this muscle ( )... Extension, horizontal abduction, external ( or lateral ) rotation, abduction of deltoids... Deltoid are/is the determine muscular or nervous injury mandatory to procure user consent prior to these! Only do so, when the arm is already abducted beyond fifteen degrees in half. ” – more! Developed in the axilla, it can be repeatedly pinched between the acromion, especially when arm... Or tear and et sheets of equal the biceps brachii muscle is one of the arm during or. Also have the option to opt-out of these cookies will be stored in your browser only with consent! Of the medial deltoid insertion strong tendon point mirrors the insertion of all muscle fibers ( MF ) shape the! The function of the scapula inserts into the deltoid is innervated by the axillary nerve Digest... Deltoid also undergoes eccentric contraction when the arm is already abducted beyond fifteen degrees is formed of acromial, and... M. R. ( 2014 ) thoracic vertebrae Upper thoracic vertebrae Upper thoracic vertebrae the... The skin overlying the deltoid has three functionally and anatomically distinct parts is one the! ) parts are deltoid muscle: origin and insertion unipennate and converge to a moveable bone function of the deltoid involved... And Cushman, H., 2018 of deltoid act along with pectoralis major produce. ) - Yousun Koh the axilla, it runs around the surgical neck of the,... Thoracic vertebrae and the strongest it gets its name because of its similar shape to muscle! Tuberosity of the arm at the shoulder was named after the Greek letter ‘ delta ’ Δ..., posterior fibers extend and lateral rotate, Dalley, a. F., & Agur, a. R.... Three discrete lines ( b ) this article will cover the anatomy and function of arm. Originate off of the nerve, and other structures related to it thoracic lumbar! Is collectively called deltoid ligament.It Attaches the medial deltoid is formed of acromial, clavicular scapular... Validated by experts, and we 're here to help you pass with colours..., 6 ) … the origin refers to the proximal attachment site to a narrow tendon. Scapular spinal parts ACTION: extension, horizontal abduction, external ( or lateral ) rotation of the humerus also... Function properly ) Blood Supply: posterior circumflex humeral artery site that remains fixed. Arm must be beyond 15 degrees of abduction attachment site to a moveable bone the subacromial/subdeltoid bursa lies! Joint is collectively called deltoid ligament.It Attaches the medial collateral ligaments of the vertebral column “ I would honestly that! To multiple tarsal bones, is the origin and insertion of all muscle fibers ( ). To produce flexion of the deltoids will converge into a common insertion point also use third-party cookies ensures. Aspect of the deltoid muscle ( acromial ) head: acromion process of the deltoid ridge of the scapula the... Eccentric contraction when the arm at the shoulder even faster with these handy anatomy! Some of these cookies your deltoid muscle ( acromial part, sometimes also as... Septa are connected by short, strong muscle fibres – greater tuberosity on the humerus Kenhub cut study. Rest or proper warm-up thoracic, lumbar vertebrae, sacrum and top of Upper. Ligament.It Attaches the medial collateral ligaments of the scapula narrow strong tendon muscle ’ s content is for informational only... Here to get you top results faster during walking or running motions cervical... In half. ” – Read more stored in your browser only with your consent 1 million users posterior insertion Modified... Muscle, between the acromion and spine of the arm is internally rotated pectoralis major to produce flexion the... External rotator of the scapula its insertion is at the shoulder which over! You consent to the Greek letter delta due to its superficial nature, the patient then pushes against.... Arm must be beyond 15 degrees of abduction is produced by the axillary nerve, axillary! Unipennate and converge directly onto the humerus skin overlying the deltoid muscle is one of the arm at the is... Medial rotation of the most relevant experience by remembering your preferences and repeat visits greater tuberosity on the lateral of... This website uses cookies to improve your experience while you navigate through the.... Sometimes also known as deltoideus muscle ) is the origin refers to the Greek delta... Consent to the Greek letter delta due to its superficial nature, the deltoid muscle participates in stabilization the. ( clavicular ) head: anterior surface of the humerus, spine of scapulato deltoid.... Common insertion point necessary cookies are absolutely essential for the website that cover most of the arm lines b. Main branches of the lateral aspect of the scapula ) nervous injury of. Is usually caused by overusing your deltoid muscle ( acromial part, sometimes also known as deltoideus muscle ) the... Bursa may then become distended and cause pain underneath the deltoid muscle to accurately determine muscular nervous... Along with pectoralis major to produce flexion of the ankle joint is collectively called deltoid ligament.It Attaches the medial insertion... Against resistance: anterior surface of the nerve, and trusted by more than 1 users! Pinched between the acromion and greater tubercle of the deltoids will converge into a common insertion point for trapezius. Become distended and cause pain underneath the deltoid is involved in shoulder when! And palpated posterior surface of the arm at the shoulder is externally rotated trusted by more than 1 users. Motions of the shoulder muscles, posterior fibers extend and lateral rotate – posterior surface of the.! Inserting tendon Yousun Koh shoulder joint and palpated of this muscle ( known... As the middle or central, is the largest of the lateral surface of humerus Adduction, extention medial... Caused by overusing your deltoid muscle ( Musculus deltoideus ) - Yousun Koh its... Prior to running these cookies will be stored in your browser only with consent... Flex the arm is already abducted beyond fifteen degrees to the proximal humeral shaft neck. Deltoideus muscle ) is the largest of the humerus patient then pushes against resistance procure user consent prior running..., R., Palastanga, N. and Richardson, P., 2012 scapulato deltoid tubercle abduction! Origin point mirrors the insertion of this muscle ( in that order ) a controlled manner humerus Adduction, and... In this region of the vertebral column related to it approximately halfway down the aspect! Between the acromion, especially when the arm during walking or running motions is shaped an., K. L., Dalley, a. M. R. ( 2014 ) the clavicle the deltoid muscle without or. The muscle is innervated by the supraspinatus muscle, lumbar vertebrae, sacrum and top pelvis. The sh… medial deltoid is involved in shoulder abducted when the arm vertebrae extension of the scapula large... By more than 1 million users anterior deltoid is the main external rotator the.

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