Biceps brachii anatomy, as the name implies, is a two-headed muscle on the anterior brachium. It has a long, lateral head and a short, medial head. Origin Insertion Function Innervation The subscapularis is woven between the upper attachments of biceps brachii. It extends under the coracoid process to the medial lip of the bicipital groove. […]
The triceps brachii, as the name implies, is a 3 headed muscle on the posterior upper arm. It has a lateral, medial, and long head. The long head attaches to the scapula and ulna, trapping the humerus in-between them. Origin Insertion Function Innervation The Triceps brachii is woven with the muscles and neurovascular bundle of
The Deltoid is a three-headed muscle that forms the rounded bulk of the shoulder. It is named after the Greek letter delta, which it resembles. Brief Anatomy Overview Origin lateral third of the clavicle, acromion and spine fo the scapula Insertion deltoid tuberosity of the humerus Function abduction of the humerus, strongest in slight medial
The coracobrachialis is a long muscle on the upper, inside edge of the upper arm. Origin Insertion Function Innervation The coracobrachialis is typically a long single belly but does have clinically significant variations. The coracobrachialis is one of three muscles that attach to the coracoid process of the scapula. It usually attaches to the
Overview The anatomy of the teres major is both complicated and straightforward. At first glance, it is a rounded (“teres”) structure with two attachments. However, variations in the muscles and neurovascular bundle that surround it vary its role in the shoulder. Origin Insertion Function Innervation It is a simple rounded muscle that attaches to the
Overview Rotator cuff muscle anatomy is both simple and complicated in their anatomy. Simply put, they secure and refine movements of the head of the humerus. However, each muscle has complications in structure and function. Origin Insertion Function Innervation As a whole, they complete each other in the balancing act of securing the humeral head.
The anatomy of the infraspinatus is a bit more complicated than typically explained. A more detailed understanding is helpful for effective neuromuscular massage. The trigger point locations, which produce different patterns, are in different bellies. Overview of Anatomy Overview The infraspinatus is a flat rotator cuff muscle located in the infraspinous fossa of the scapula.
The anatomy of the subscapularis muscle is more complex than at first glance. For example, it has multiple sections and a variable attachment. The subscapularis is a thick, fan-shaped muscle on the underside of the shoulder blade. By far, it is the largest and strongest rotator cuff muscle. Also, it is the largest shoulder muscle.
Overview Teres minor is a simple muscle in a complicated area of structural anatomy. It’s a flat muscle that lies up under the inferior belly of the infraspinatus and posterior deltoid. It is the border of the rotator cuff muscle. Consequently, teres minor covers the long head of the triceps, which attaches to the
Overview Supraspinatus, in the supraspinous fossa, is the most superior of the rotators cuff muscles, Origin Insertion Function Nerve Supraspinatus anatomy presents as a simple strip of muscle. It attaches to the top of the scapula and inserts on the head of the humerus. However, Shoulder impingement and tendinopathy prompted more extensive studies. Actually, it
