Written by Oliver Jones

Last updated October 5, 2022 • 3 Revisions •

The brachialis is a muscle in the anterior compartment of the upper arm. It lies deep to the biceps brachii and forms the floor of the cubital fossa.

  • Attachments: Originates from the medial and lateral surfaces of the humerus shaft. It inserts onto the ulnar tuberosity, immediately distal to the elbow joint.
  • Function: Flexion at the elbow.
  • Innervation: Musculocutaneous nerve (with contributions from the radial nerve).
  • Blood supply: Brachial artery and radial artery

Fig 1
The coracobrachialis, biceps brachii and brachialis muscles of the anterior upper arm.

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