BrachialisThe structure indicated is the brachialis muscle. The brachialis muscle is one of three muscles in the anterior compartment of the arm:
- Biceps brachii
Origin: Distal half of anterior humerus
Insertion: Ulna tuberosity
Action: Flexion of elbow
Innervation: Musculocutaneous nerveLearn more about the anatomy of the arm muscles in this tutorial.