Musculus brachialis

The video tutorial provides an in-depth look at the brachialis muscle, a key muscle in the upper arm. It explains the muscle's location, often hidden by the biceps, and its contribution to the arm's contour. The origin of the brachialis is at the anterior surface of the distal humerus, and it attaches to the ulnacular tuberosity. The muscle is primarily 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, surpassing the biceps due to its proximity to the joint and single articulation. Additionally, it plays a role in maintaining joint capsule tension during flexion.

What is the primary role of the brachialis muscle in the upper arm?

• To support the shoulder joint

• To contribute to the contour of the upper arm

• To enhance the appearance of the triceps

• To stabilize the wrist

Where does the brachialis muscle attach distally?

• To the clavicle

• To the scapula

• To the ulnacular tuberosity

• To the radial tuberosity

Which nerve primarily innervates the brachialis muscle?

• Median nerve

• Ulnar nerve

• Radial nerve

• Musculo cutaneous nerve

Why is the brachialis muscle considered stronger than the biceps in elbow flexion?

• It is innervated by multiple nerves

• It has more muscle fibers

• It is larger in size

• It is closer to the elbow joint and has a single articulation

What additional function does the brachialis muscle serve in the elbow joint?

• It rotates the forearm

• It maintains the tension of the joint capsule

• It stabilizes the shoulder

• It helps in extending the elbow