Biceps brachii muscle,5 marks easy structure,origin, insertion

 

Origin:

Short head: Arises from the apex of the coracoid process of the scapula.

- Long head: Originates from the supraglenoid tubercle of the scapula.

Insertion:

Radial tuberosity of the radius.

 Deep fascia of the forearm (bicipital aponeurosis insertion).

Innervation:

Musculocutaneous nerve (C5-C6).

Blood Supply:

Supplied by branches of the brachial artery.

Function:

Primarily responsible for flexion and supination of the forearm at the elbow joint. It also weakly flexes the arm at the glenohumeral joint.

The biceps brachii muscle derives its name from its two heads, which merge into one distal body, giving it a distinctive structure.

Origin and Insertion:

The long head originates from the supraglenoid tubercle above the glenoid cavity of the scapula and lies within the intracapsular space.

The short head arises from the apex of the coracoid process of the scapula and partially blends with the coracobrachialis origin tendon.

Both heads unite into one large muscle belly at the anterior side of the humerus and attach to the radial tuberosity. The bicipital aponeurosis, or lacertus fibrosus, inserts at the deep fascia of the forearm.