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