The muscles of the shoulder girdle

Deltoid muscle (m. deltoideus) assigns the shoulder outward to a horizontal plane, with bundles of muscles pull the front hand forward and back - back. This is a thick triangular muscle covering the shoulder joint and shoulder muscles partially. Its large fan-shaped beams converge to the apex of the triangle pointing downwards. Muscle starts from the axis of the scapula, acromion and the lateral part of the clavicle and the deltoid tuberosity is attached to the humerus. Below the lower surface of the muscle is subdeltoid bag (bursa subdeltoidea).

Supraspinatus muscle (m. supraspinatus) has a triangular shape and lies in the supraspinatus fossa scapula, lying directly beneath the trapezius muscle. Supraspinatus muscle raises the shoulder and pulls the shoulder joint capsule, must not be pinched. Starting point the muscles are the supraspinatus fossa on the surface, and mounting position - at the top of a large mound humerus and on the back of the shoulder joint capsule.

Infraspinatus muscle (m. infraspinatus) rotates the arm outwards, raised his hand and pulls back removes the shoulder joint capsule. This is a flat triangular muscle that fills the entire infraspinatus fossa. The upper part is covered trapezius and deltoid muscles and the lower - and the latissimus dorsi muscle large circular muscle. Infraspinatus muscle starts from the wall of the infraspinatus fossa and the back surface of the blade, and attached to the middle floor of a large mound humerus and shoulder joint capsule. In place of its attachment to the humerus is podsuhozhilnaya infraspinatus muscle pouch (bursa subtendinea mm. Infraspinati).

In Fig. 111.
Upper arm and shoulder front view
1 - muscle lifting the blade;
2 - deltoid;
3 - small diamond-shaped muscle;
4 - pectoralis minor;
5 - subscapularis muscle;
6 - a large diamond-shaped muscle;
7 - pectoral muscle;
8 - serratus anterior;
9 - latissimus dorsi;
10 - coracoid, the shoulder muscles;
11 - triceps brachii: a) a long head, b) the medial head;
12 - the biceps;
13 - shoulder muscles;
14 - round pronator;
15 - bicipital aponeurosis;
16 - brachioradialis muscle;
17 - fascia of forearm
In Fig. 112.
Upper arm and shoulder front view
1 - biceps: a) a short head, b) a long head;
2 - deltoid;
3 - subscapularis muscle;
4 - the coracoid, the shoulder muscles;
5 - a large circular muscle;
6 - triceps brachii: a) a long head, b) the medial head;
7 - shoulder muscles;
8 - biceps tendon
In Fig. 113.
Shoulder muscles and shoulder girdle side view
1 - supraspinatus fascia;
2 - infraspinatus fascia;
3 - a large circular muscle;
4 - deltoid;
5 - triceps brachii: a) a long head, and b) lateral head, and c) the medial head;
6 - the biceps;
7 - shoulder muscles;
8 - tendon of triceps brachii;
9 - brachioradialis muscle;
10 - long radial extensor wrist;
11 - anconeus;
12 - fascia of forearm
In Fig. 114.
Upper arm and shoulder, rear view
1 - supraspinatus fascia;
2 - supraspinatus muscle;
3 - infraspinatus fascia;
4 - infraspinatus muscle;
5 - a small circular muscle;
6 - a large circular muscle;
7 - deltoid;
8 - triceps brachii: a) a long head, and b) lateral head, and c) the medial head;
9 - tendon of triceps brachii;
10 - brachioradialis muscle;
11 - long radial extensor wrist;
12 - anconeus;
13 - fascia of forearm

Small circular muscle (m. teres minor) turns the shoulder outward, at the same time taking him back slightly, and pulls the shoulder joint capsule. Oblong, rounded muscle, the upper part of which is adjacent to the infraspinatus muscle, the front part is covered deltoid muscle and the posterior part - a large, round muscle. Starting point is located on the rear surface of the blade below the infraspinatus muscle, and mounting position - on the bottom floor of a large hill humerus and the back of the shoulder joint capsule.

The big round muscle (m. teres major) turns into the shoulder and pulls him back, causing his hand to the body. The elongated flat muscle, which is adjacent to the latissimus dorsi and partially covering it in the posterior part. In the external part of a large circular muscle is covered deltoid muscle. Starting point - the rear surface of the blade at its lower corner, place attachment - the crest of a small tubercle of humerus. Near the site of attachment is podsuhozhilnaya bag big round muscle (bursa subtendinea mm. Teretis majoris).

Subscapularis muscle (m. subscapularis)  rotates the arm inward and is involved in bringing it to the body. The flat broad triangular muscle, which fills the entire subscapular fossa. It starts on the surface of the subscapular fossa, and ends on a small hillock humerus and the front of the shoulder joint capsule.

In the place of attachment is a small bag podsuhozhilnaya subscapularis (bursa subtendinea mm. Subscapularis).





List of Abbreviations

a., aa. — arteria, arteriae (artery, the artery)

lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)

m., mm. — musculus, musculi (muscle, the muscle)

n., nn. — nervus, nervi (nerve, the nerve)

r., rr. — ramus, rami (branch)

s. — seu (or)

v., vv. — vena, venae (vienna)