Middle Deltoid. 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 model consists of rectangular OT and ET sheets of equal The deltoid muscle is divided into three main sections, which includes the anterior (front), medial (middle), and posterior (back) sections. Latissimus dorsi. • Powerful adductor, adducts arm. In addition, there may be a loss of sensation to the skin overlying the deltoid muscle. The tendinous insertion of the deltoid forms three discrete lines (b). Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Action: extension, horizontal abduction, external (lateral) rotation, abduction of the humerus. Reviewer: The clavicular (anterior) fibers of deltoid  act along with pectoralis major to produce flexion of the arm during walking or running motions. ). Deltoid pain may be indicative of injuries involving other muscles that stabilize the glenohumeral joint, and other structures related to it. 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. However, it can only do so, when the arm is already abducted beyond fifteen degrees. NERVE. This then triggers the remainder of the glenohumeral joint to assist with stabilizing the sh… It passes inferiorly surrounding the glenohumeral joint on all sides and inserts onto the humerus. Lateral third of clavicle, acromion, spine of scapulato deltoid tubercle. Deltoid. The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. 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. These cookies do not store any personal information. You also have the option to opt-out of these cookies. The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. Nerve Supply of the Deltoid. 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 & radius. Necessary cookies are absolutely essential for the website to function properly. It IS NOT medical advice. Preview this quiz on Quizizz. Edinburgh: Elsevier Churchill Livingstone. 6th ed. The subacromial/subdeltoid bursa, lies deep to the deltoid muscle, between the acromion and supraspinatus tendon. Middle (acromial) head: acromion process and spine of the scapula. The deltoid muscle is located on the outer aspect of the shoulder and is recognized by its triangular shape. It is incredibly important to properly test the function of the deltoid muscle to accurately determine muscular or nervous injury. The deltoid has several intramuscular tendons at its origin (a). All rights reserved. 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 deltoid also undergoes eccentric contraction when the arm is being lowered, or adducted. This is important from a functional standpoint as strengthening the posterior fibers of the deltoid muscle can help to offset the tendency of the shoulder to become internally rotated due to poor posture. The deltoid muscle has a very broad origin and a narrow base, thus creating its triangular shape. It is named after the Greek letter delta, which is shaped like an equilateral triangle. 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). Axillary nerve (C5, 6) … 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. The bursa may then become distended and cause pain underneath the deltoid muscle. Lateral Third of the Clavicle The subacromial/subdeltoid bursa can become irritated and swollen as it can be repeatedly pinched between the acromion and greater tubercle of the humerus. Once the arm is in this position, the patient then pushes against resistance. 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. University grade. Innervation: Axillary nerve (C5, C6) Blood Supply: Posterior circumflex humeral artery. Insertion: deltoid tuberosity on the lateral humerus. 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. Copyright © DELTOID. Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft. The clavicular and scapular spinal fibers of the muscle guide the arm through the abduction motion. Excellent visuals! 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. To properly test the function of the deltoid and the axillary nerve, the arm must be beyond 15 degrees of abduction. Clavicle (Anterior Lateral Third) Insertion. It gets its name because of its similar shape to the Greek letter ‘delta’ (Δ). 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 . The insertion refers to the muscle’s distal attachment site to a moveable bone. 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. Tags: Question 70 . 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! Insertion: Attaches to the deltoid tuberosity of the humerus. An excellent book for those beginning the study of anatomy. Origin. Essentials Of Anatomy & Physiology: The Unity Of Form And Function. 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. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. 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. Deltoid muscle (Musculus deltoideus) - Yousun Koh. The anterior deltoid is involved in shoulder abducted when the shoulder is externally rotated. Due to its superficial nature, the deltoid can be easily observed and palpated. New York: McGraw-Hill Education. These fibers are also active during internal (medial) rotation of the humerus. Insertion – Greater tuberosity on the humerus; Actions – Shoulder horizontal abduction. The Medial Deltoid is innervated by the Axillary Nerve. Erector spinae. Fractures in this region of the humerus can, therefore, affect the functioning of the nerve, and consequently the deltoid muscle. ORIGIN. The deltoid is a thick, triangular shoulder muscle. scapula, humerus & ulna. It is the main external rotator of the shoulder joint. Internal rotation of the arm at the shoulder. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. It is a multipennate muscle. 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. Philadelphia, PA: Lippincott Williams & Wilkins. It is one of the most sizably voluminous and most superficial cervical muscles. AI anterior insertion, MI middle insertion, PI posterior insertion (Modified from Rispoli et al. 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": humerus & radius. The origin refers to the proximal attachment site that remains relatively fixed during contraction. Muscle overlays on the human body. It passes inferiorly surrounding the glenohumeral joint on all sides and inserts onto the humerus . Medial Deltoid Insertion. the muscle body, as the humerus insertion area is also far too small for direct insertion of all muscle fibers (MF). Anatomy And Human Movement. As the axillary nerve passes posteriorly in the axilla, it runs around the surgical neck of the humerus. Register now The ligament is composed of two layers. We also use third-party cookies that help us analyze and understand how you use this website. answer choices . Anterior Deltoid Origin. The deltoid has three functionally and anatomically distinct parts. Clinically Oriented Anatomy (7th ed.). Each head of the deltoid has slightly different insertion points, allowing for more control and a full range of motion at the shoulder joint. 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. The origin and insertion refer to the anatomic locations of where a muscle attaches (usually a bone). INSERTION. This muscle originates at the aponeuroses covering the infraspinous muscle, its insertion is at the deltoid ridge of the humerus. The deltoid muscle was named after the Greek letter Delta due to … Axillary nerve. origins and insertions DRAFT. (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. Read more. Pain in the Medial Deltoid can be the result of a muscle strain, tear or from overuse. It gets its name because of its similar shape to the Greek letter ‘delta’ (Δ). Origin: Originates from the scapula and clavicle. In overhead motions of the arm, the greater tubercle of the humerus approaches the acromion, especially when the arm is internally rotated. This article will cover the anatomy and function of the deltoid muscle. Kenhub. Insertion. 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. Egle Pirie **Refer to the posterior (back) of the muscle in the picture** This U-shaped origin point mirrors the insertion point for the trapezius muscle. 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. Actions: Abduction of the arm at the shoulder. The sub-deltoid approach to the metaphyseal region of the humerus.. Contracture of the Deltoid Muscle. Roberto Grujičić MD Soames, R., Palastanga, N. and Richardson, P., 2012. It is mandatory to procure user consent prior to running these cookies on your website. In addition, these fibers will assist in external (or lateral) rotation of the humerus. Movement/Action. Gray's Anatomy (41tst ed.). It is hard to find since it is under developed in the fetal pig. Learn the muscles of the shoulder even faster with these handy muscle anatomy reference charts! 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. Function of the Deltoid. Attachments of the Deltoid. The anterior head of the deltoid works closely with pectoralis major, which allows for full stabilization near its more superior insertion on the clavicle. 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 Assists with external rotation of the arm at the shoulder. Anterior Deltoid Origin and Insertion. The clavicular (anterior) and scapular spinal (posterior) parts are both unipennate and converge directly onto the inserting tendon. 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. The deltoid muscle origin attaches to the spine of the scapula and lateral third of the clavicle. The muscle fibres then run inferiorly towards the humeral shaft and converge to a narrow strong tendon. The deltoid is a thick, triangular shoulder muscle. This is what allows the front delts to perform its function of raising the arms overhead. Kim Bengochea, Regis University, Denver, Author: 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 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. SURVEY . The anterior fibers of the deltoid flex the arm at the shoulder. Insertion: (distal attachments) a. Deltoid tuberosity of the humerus. This chart describes these points of origin. Abducts arm, anterior fibers flex and medial rotate,posterior fibers extend and lateral rotate. Muscle. 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 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. These cookies will be stored in your browser only with your consent. 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