Brachialis

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

By TeachMeSeries Ltd (2025)

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