What muscle's insertion is located at the distal cranial border of humerus?

• A. Brachiocephalicus
• B. Latissimus dorsi
• C. Omotransversarius
• D. Serratus ventralis

Answer: (A)

The muscle whose insertion is located at the distal cranial border of the humerus is the brachiocephalicus. This muscle is significant as it serves multiple functions including the movement of the forelimb and the head/neck. It has two main parts: the cleidocephalicus and the cleidobrachialis. The cleidobrachialis part specifically inserts on the cranial border of the humerus, allowing it to facilitate actions like extending the shoulder joint and aiding in the protraction of the limb.

The other muscles listed have different anatomical insertions or functions. The latissimus dorsi, for example, inserts on the medial side of the humerus and is primarily involved in actions such as adduction and extension of the forelimb. The omotransversarius, which is associated with neck movements and supports the scapula, does not attach to the humerus. Lastly, the serratus ventralis is responsible for stabilizing the scapula and has a different insertion on the medial surface of the scapula. Each muscle plays a distinct role in the musculoskeletal system, but the brachiocephalicus is the only one that meets the criteria of inserting at the distal cranial border of the humerus