What is the distal attachment of the brachialis?

The distal attachment of the brachialis is the coronoid process and tuberosity of the ulna. This muscle is primarily responsible for elbow flexion and is located deep to the biceps brachii. When the brachialis contracts, it pulls on the ulna at its distal attachment, facilitating the bending of the elbow.

The coronoid process is a prominent feature on the ulna, and the tuberosity provides a strong point for muscle attachment, allowing for effective force generation when flexing the arm. This attachment site is essential for the brachialis to fulfill its role as a powerful flexor of the elbow joint across various arm positions, including when the forearm is pronated or supinated.

The other options do not accurately reflect the location where the brachialis attaches distally. The coracoid process of the scapula serves as an attachment point for different muscles, while the tuberosity of the radius is primarily associated with the biceps brachii. The medial surface of the humerus does not serve as a distal attachment for any part of the brachialis.