What is the distal attachment of the coracobrachialis?

The coracobrachialis muscle has its distal attachment at the medial surface of the middle of the humerus. This attachment point allows the muscle to assist in actions such as flexion and adduction of the arm at the shoulder joint. The position on the humerus facilitates its role in stabilizing the shoulder and providing control during movements of the upper limb.

The other options do not reflect the anatomical characteristics or attachment sites of the coracobrachialis. For example, the coronoid process of the ulna and the tuberosity of the radius are related to muscles and movements of the forearm and shoulder but are not associated with the coracobrachialis. Similarly, the supraglenoid tubercle of the scapula serves as an attachment for the long head of the biceps brachii, not for the coracobrachialis. This anatomical knowledge is crucial for understanding upper limb biomechanics and muscle functions.