Biceps Brachii

Biceps brachii Origin

Long Head: The long headRounded proximal end that fits into the acetabulum of the hip bone. of the biceps originates from the supraglenoid tubercle of the scapulaTriangular “shoulder blade” on posterior thorax; connects clavicle and humerus..

Short Head: The short head of the biceps originates from the coracoid processHook-like projection anterior to the acromion; attachment for muscles of the arm and chest. of the scapula.

Lateral Head: The lateralAway from the midline of the body. head originates from the posterior surface of the humerusLong bone of the upper arm; articulates with scapula at shoulder and radius/ulna at elbow., above the radial groove.

Medial Head: The medialToward the midline of the body head originates from the posterior surface of the humerus, below the radial groove.

Biceps brachii Insertion

The two heads of the biceps merge to form a single muscle belly. This muscle belly inserts onto the radial tuberosityRough bump just below head for biceps muscle attachment.. The radial tuberosity is a bony protuberance on the radiusLateral forearm bone (thumb side); rotates around ulna during pronation/supination. bone in the forearm. Additionally, the biceps brachii inserts into the deepAway from the surface of the body. fascia of the forearm via the bicipital aponeurosis.

Biceps brachii Actions

Assistance in Shoulder Flexion

Supination of the Forearm

Elbow Flexion