anatomy

Brachial biceps

The BRACHIAL BICIPITE is a biarticular muscle that is part of the anterior muscles of the arm. It consists of two heads: one long and one short.

The long head, situated laterally, originates from the supra-glenoid tubercle of the scapula and from the glenoid labrum (it therefore has an intracapsular origin) through a long cylindrical-shaped tendon. The short head originates from the apex of the coracoid process; the two heads join in a single muscular belly near the middle third of the arm that is inserted with a strong tendon to the bicipital tuberosity of the radius. From the medial margin of this tendon starts a second tendon, superficial, called the fibrous lacerto which expands downwards and medially merges with the antibrachial fascia.

The biceps brachialis muscle is the main flexor muscle of the arm and forearm. The effectiveness of its flexor action is maximum with the elbow flexed at 80-90 °. Its secondary action is supination. It also intervenes in the movements of adduction (short head), abduction and internal rotation (long head) and flexion of the arm in synergy with other muscles, stabilizes the scapolohumeral articulation and antiverge it.

It is innervated by the musculocutaneous nerve (C5-C6).

ORIGIN

The long head originates from the supra-venenoid scapular tuberosity and with a tendon from the glenoid lip

The short head originates from the apex of the coracoid process of the scapula (coracoid)

INSERTION

The long head is inserted on the short head which is inserted with a very robust tendon to the bicipital tuberosity of the radius, a second superficial tendon radiates in the fascia of the forearm from the ulnar side.

ACTION

The forearm flexes and supine, flexes the arm, participates in the horizontal extension, adduction, abduction and internal rotation of the arm. Anti-up the shoulder.

INNERVATION

NUSCLE MUSCLE CLUB (C5, C6)

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