Brachialis muscle

This video tutorial covers the brachialis muscle, detailing its origin, insertion, innervation, and function. The brachialis is a strong muscle located in the upper arm, primarily beneath the biceps brachii. It originates from the distal half of the humerus and inserts at the ulna's tuberosity. The muscle is innervated by the musculocutaneous nerve, with some individuals also receiving innervation from the radial nerve. The brachialis is the strongest flexor of the elbow joint, contributing to elbow flexion and maintaining joint capsule tension. The video concludes with a call to explore more anatomy resources on KenHub.

Where is the brachialis muscle primarily located?

• On the surface of the upper arm

• Under the biceps brachii

• In the forearm

• In the shoulder

Where does the brachialis muscle originate?

• Lateral epicondyle of the humerus

• Medial epicondyle of the humerus

• Distal half of the anterior humerus

• Proximal half of the humerus

Which nerve primarily innervates the brachialis muscle?

• Median nerve

• Musculocutaneous nerve

• Ulnar nerve

• Radial nerve

What is the primary function of the brachialis muscle?

• Abduction of the shoulder

• Flexion of the elbow joint

• Rotation of the forearm

• Extension of the elbow joint

How does the brachialis muscle help protect the joint capsule?

• By preventing hyperflexion

• By aiding in pronation

• By maintaining tension during hyperextension

• By stabilizing the shoulder joint