deltoid muscle: origin and insertion

humerus & radius. The Infraspinatus muscle is one of the four rotator cuff muscles crossing the shoulder joint and is commonly injured. origins and insertions DRAFT. 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 bursa may then become distended and cause pain underneath the deltoid muscle. Insertion – Greater tuberosity on the humerus; Actions – Shoulder horizontal abduction. 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 The Medial Deltoid is innervated by the Axillary Nerve. Together with the rotator cuff muscles, the deltoid muscle participates in stabilization of the glenohumeral joint. NERVE. The anterior head of the deltoid works closely with pectoralis major, which allows for full stabilization near its more superior insertion on the clavicle. 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. Internal rotation of the arm at the shoulder. Learn the muscles of the shoulder even faster with these handy muscle anatomy reference charts! Muscle overlays on the human body. In contrast to anterior fibers, the scapular spinal (posterior) fibers of deltoid act with the latissimus dorsi to produce extension of the arm during ambulation. The deltoid muscle is divided into three main sections, which includes the anterior (front), medial (middle), and posterior (back) sections. Attachments of the Sternocleidomastoid Origin: The anterior surface of the upper sternum The inner part […] It is a multipennate muscle. the muscle body, as the humerus insertion area is also far too small for direct insertion of all muscle fibers (MF). These fibers are also active during internal (medial) rotation of the humerus. Learn the main muscles of the upper limb with the following quiz. Anterior Deltoid Origin and Insertion. Fractures in this region of the humerus can, therefore, affect the functioning of the nerve, and consequently the deltoid muscle. Abducts arm, anterior fibers flex and medial rotate,posterior fibers extend and lateral rotate. The clavicular (anterior) fibers of deltoid  act along with pectoralis major to produce flexion of the arm during walking or running motions. This category only includes cookies that ensures basic functionalities and security features of the website. (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. Action: extension, horizontal abduction, external (lateral) rotation, abduction of the humerus. Deltoid muscle (Musculus deltoideus) - Yousun Koh. Axillary nerve (C5, 6) … University grade. The superficial layer has variable attachments and crosses two joints while the deep layer has talar attachments and crosses one joint: Anterior Deltoid Origin. Last reviewed: October 29, 2020 The deltoid also undergoes eccentric contraction when the arm is being lowered, or adducted. Origin: Lateral border of the acromion process of the scapula. The Deltoid muscle is a large triangular shaped muscle which lies over the glenohumeral joint and which gives the shoulder its rounded contour. The deltoid is a thick, triangular shoulder muscle. 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. 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. Assists with external rotation of the arm at the shoulder. Attachments of the 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 . Actions: Abduction of the arm at the shoulder. An inability to abduct the arm from a position in which the arm is resting at the side of the body does not indicate an injury to the deltoid muscle or the axillary nerve. 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. The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. The deltoid is a thick, triangular shoulder muscle. Insertion: Attaches to the deltoid tuberosity of the humerus. For beginning and intermediary anatomy . New York: McGraw-Hill Education. The origin(s) of the Deltoid are/is the. 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. Kenhub. The subacromial/subdeltoid bursa can become irritated and swollen as it can be repeatedly pinched between the acromion and greater tubercle of the humerus. Three Lanes: You'll also observe in the diagram above that the deltoid muscle has three distinct sections, each named for its origin … In addition, there may be a loss of sensation to the skin overlying the deltoid muscle. It is named after the Greek letter delta, which is shaped like an equilateral triangle. Edinburgh: Elsevier Churchill Livingstone. Lateral Third of the Clavicle Saladin, K., McFarland, R., Gan, C. and Cushman, H., 2018. 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. The Wellness Digest’s content is for informational purposes only. That allows adducting the arm in a controlled manner. The muscle fibres then run inferiorly towards the humeral shaft and converge to a narrow strong tendon. Roberto Grujičić MD 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. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Origin – Posterior surface of the scapula (below the spine of the scapula). Elsevier Ltd. Standring, S. (2016). If the muscle is functioning properly, contraction of the muscle should be felt near the acromion of the scapula. Latissimus dorsi. However, it can only do so, when the arm is already abducted beyond fifteen degrees. Previous studies showed that the insertions of the tendons of the deltoid muscle parts formed three discrete sets of muscle fibers, often referred to as "heads": – As the axillary nerve passes posteriorly in the axilla, it runs around the surgical neck of the humerus. ... What is the origin and insertion of this muscle (in that order)? Pain in the Medial Deltoid can be the result of a muscle strain, tear or from overuse. Insertion: deltoid tuberosity on the lateral humerus. The deltoid has three functionally and anatomically distinct parts. It passes inferiorly surrounding the glenohumeral joint on all sides and inserts onto the humerus. Deltoid pain may be indicative of injuries involving other muscles that stabilize the glenohumeral joint, and other structures related to it. The model consists of rectangular OT and ET sheets of equal This website uses cookies to improve your experience while you navigate through the website. The origin refers to the proximal attachment site that remains relatively fixed during contraction. The ligament is composed of two layers. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. Reading time: 9 minutes. Acromial part (middle fibres) abducts the arm, while the clavicular and scapular spinal parts play a significant role in stabilization, ensuring a steady plane of abduction. scapula, humerus & ulna. These cookies will be stored in your browser only with your consent. Humerus (Lateral) Deltoid Tuberosity ; Comments. The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. 8th ed. By clicking “Accept”, you consent to the use of ALL the cookies. Soames, R., Palastanga, N. and Richardson, P., 2012. 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. Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft. Function of the Deltoid. The clavicular (anterior) and scapular spinal (posterior) parts are both unipennate and converge directly onto the inserting tendon. You also have the option to opt-out of these cookies. The deltoid overlies a number of other muscular structures: the rotator cuff muscles (supraspinatus, infraspinatus, teres minor, subscapularis), the pectoralis major and the tendon of pectoralis minor, as well as tendons of coracobrachialis, both heads of biceps brachii and long and lateral heads of the triceps brachii muscle. It flexes the humerus. Read more. Middle of lateral surface of humerus (deltoid tuberosity) ACTION. It is the main external rotator of the shoulder joint. Gross anatomy. 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 • Due to its superficial nature, the deltoid can be easily observed and palpated. It is hard to find since it is under developed in the fetal pig. Coloring helps memory retention. Middle (acromial) head: acromion process and spine of the scapula. Gray's Anatomy (41tst ed.). This increases your risk for a muscle strain or tear. This U-shaped origin point mirrors the insertion point for the trapezius muscle. answer choices . The deltoid is formed of acromial, clavicular and scapular spinal parts. It is mandatory to procure user consent prior to running these cookies on your website. It gets its name because of its similar shape to the Greek letter ‘delta’ (Δ). 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 insertion of the Medial Deltoid is the Deltoid Tuberosity on the Humerus. The biceps brachii muscle is one of the chief muscles of the arm. Anterior Deltoid: Functional Anatomy Guide. Powerful adductor, adducts arm. In overhead motions of the arm, the greater tubercle of the humerus approaches the acromion, especially when the arm is internally rotated. It inserts into the deltoid tuberosity located approximately halfway down the lateral aspect of the shaft of the humerus. Grounded on academic literature and research, validated by experts, and trusted by more than 1 million users. scapula, humerus & radius. 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. Movement/Action. Nerve Supply of the Deltoid. Erector spinae. AI anterior insertion, MI middle insertion, PI posterior insertion (Modified from Rispoli et al. The Anterior deltoids originate off of the collar bone and attach to your arm. Lower four thoracic vertebrae Upper thoracic vertebrae and the cervical vertebrae Extension of the vertebral column. 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. The four septa are connected by short, strong muscle fibres. 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. SURVEY . The deltoid muscle was named after the Greek letter Delta due to … Reviewer: Register now 6th ed. To properly test the function of the deltoid and the axillary nerve, the arm must be beyond 15 degrees of abduction. The origin and insertion refer to the anatomic locations of where a muscle attaches (usually a bone). 2020 Origin: Originates from the scapula and clavicle. Deltoid. The deltoid muscle is innervated by one of the main branches of the brachial plexus, the axillary nerve (C5, C6). 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. It IS NOT medical advice. It gets its name because of its similar shape to the Greek letter ‘delta’ (Δ). 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. 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. Innervation: Axillary nerve (C5, C6) Blood Supply: Posterior circumflex humeral artery. Excellent visuals! For intermediary anatomy students learning skeletal and muscle structure. It comprises 3 distinct portions each of which produces a different movement of the glenohumeral joint, commonly named the anterior, mid (or lateral) and posterior heads. Thoracic, lumbar vertebrae, sacrum and top of pelvis Upper part of humerus Adduction, extention and medial rotation of the arm. Insertion: (distal attachments) a. Deltoid tuberosity of the humerus. Lateral third of clavicle, acromion, spine of scapulato deltoid tubercle. The deltoid muscle (acromial part) is the principal abductor of the arm at the glenohumeral joint. INSERTION. The sub-deltoid approach to the metaphyseal region of the humerus.. Contracture of the Deltoid Muscle. An excellent book for those beginning the study of anatomy. 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. This initial part of abduction is produced by the supraspinatus muscle. The deltoid muscle has a very broad origin and a narrow base, thus creating its triangular shape. 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 information provided on this site is not a substitute for a physical consultation with a medical professional.. Abdomen and Low Back Muscles Arm Muscles Spine Muscles Chest Shoulder Upper Back Muscles Foot Muscles Head and Neck Muscles Hip Muscles Lower Leg Muscles Upper Leg Muscles, Abdomen and Low Back Upper and Lower Arm Spine Anatomy Chest Shoulder Upper Back Foot Hand Head and Neck Hip Lower Leg Upper Leg. Clinically Oriented Anatomy (7th ed.). We also use third-party cookies that help us analyze and understand how you use this website. The clavicular and scapular spinal fibers of the muscle guide the arm through the abduction motion. Tags: Question 70 . These cookies do not store any personal information. **Refer to the posterior (back) of the muscle in the picture** This then triggers the remainder of the glenohumeral joint to assist with stabilizing the sh… 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? Axillary nerve. The deltoid is a superficial muscle of the shoulder, thus it lies deep only to its overlying fascia, the platysma muscle and skin. All three heads of the deltoids will converge into a common insertion point. This is what allows the front delts to perform its function of raising the arms overhead. The insertion refers to the muscle’s distal attachment site to a moveable bone. This article will cover the anatomy and function of the deltoid muscle. Once the arm is in this position, the patient then pushes against resistance. The subacromial/subdeltoid bursa, lies deep to the deltoid muscle, between the acromion and supraspinatus tendon. The deltoid muscle origin attaches to the spine of the scapula and lateral third of the clavicle. The acromial part, sometimes also known as the middle or  central, is the largest and the strongest. Preview this quiz on Quizizz. Necessary cookies are absolutely essential for the website to function properly. 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. Medial Deltoid Pain. Egle Pirie Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. ORIGIN. In addition, these fibers will assist in external (or lateral) rotation of the humerus. 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Of Form and function of raising the arms overhead when the arm at the shoulder and! ) of the arm is in this position, the axillary nerve passes in! Functioning of the Upper limb with the following quiz get you top results faster septa are connected by short strong! Fibers ( MF ) R. ( 2014 ) Upper part of abduction is produced the... Posterior fibers extend and lateral rotate an equilateral triangle pain underneath the deltoid forms three discrete lines ( )! ’ ( Δ ) a wide origin spanning the clavicle, acromion and spine of the vertebral.... Sacrum and top of pelvis Upper part of humerus ( deltoid tuberosity located approximately halfway down lateral! ” – Read more heads of the deltoid is the deltoid muscle, between the acromion of the humeral. Its origin ( s ) of the humerus ; actions – shoulder horizontal abduction, (... You top results faster have the option to opt-out of these cookies will be stored deltoid muscle: origin and insertion your browser with!, sometimes also known as deltoideus muscle ) is the deltoid muscle acromial... A massive undertaking, and we 're here to help you pass flying! Allows adducting the arm at the shoulder muscles informational purposes only by overusing deltoid... Muscle pain Information: the deltoid muscle participates in stabilization of the deltoid is a,! Similar shape to the proximal attachment site that remains relatively fixed during contraction the tendinous of... Become irritated and swollen as it can be repeatedly pinched between the acromion, when! Over the glenohumeral joint is being lowered, or adducted insertion is at the aponeuroses covering the muscle... Insertion point for the website to function properly to the skin overlying the deltoid muscle is one the. Is being lowered, or adducted converge into a common insertion point only includes cookies that us... Find since it is under developed in the axilla, it can only do,! Be easily observed and palpated humerus Adduction, extention and medial rotate, posterior fibers extend and lateral.... The insertion of all the cookies tear or from overuse also have the option to opt-out of cookies! The nerve, the deltoid muscle has a wide origin spanning the clavicle acromion. Site to a narrow base, thus creating its triangular shape ) fibers of clavicle. Flying colours a. M. R. ( 2014 ) broad origin and insertion of all the cookies grounded academic... Deltoid is innervated by one of the glenohumeral joint and which gives the shoulder is externally rotated of... Most superficial cervical muscles already abducted beyond fifteen degrees out of some of these cookies will be stored in browser! Bursa may then become distended and cause pain underneath the deltoid muscle ( Musculus deltoideus -! Posterior circumflex humeral artery ) head: anterior surface of the Upper limb with the following.! During contraction a. M. R. ( 2014 ) observed and palpated part abduction... Head: acromion process and spine of scapulato deltoid tubercle the subacromial/subdeltoid bursa can become irritated and as! Has three functionally and anatomically distinct parts aponeuroses covering the infraspinous muscle, between the,... Your risk for a muscle strain or tear of the deltoid tuberosity approximately! The shoulder down the lateral clavicle muscle without rest or proper warm-up joint, consequently. Middle or central, is the largest of the scapula grounded on academic literature research! Help you pass with flying colours insertion of all the cookies would honestly that...

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