Biceps brachii

M. biceps brachii

Spindle-shaped muscle on the cranial surface of the arm; flexes the elbow and extends the shoulder.

Laterality:: Paired (left and right)

Draft, not yet reviewed by a veterinarian. Content may contain errors. It is published so the community can review it.

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This piece is a schematic shape, not a scan: there is no freely licensed model for this structure yet.

3D model of this piece: Vet Atlas procedural musculature, CC BY-SA 4.0

Overview

Its tendon of origin crosses the shoulder joint and runs in the intertubercular groove of the humerus, held by the transverse humeral retinaculum and wrapped in an extension of the joint capsule.

Origin

Supraglenoid tubercle of the scapula (tuberculum supraglenoidale).

Insertion

Radial and ulnar tuberosities, on the medial side of the proximal forearm.

Action

Flexes the elbow and extends the shoulder.

Innervation

Musculocutaneous nerve (n. musculocutaneus).

Clinical relevance

Bicipital tenosynovitis (inflammation of the tendon of origin and its sheath in the intertubercular groove) is a common cause of forelimb lameness in adult medium and large breed dogs.