What is the middle region of the humerus called?

The middle region of the humerus is known as the diaphysis. This is the central part of the long bone, which is primarily composed of compact bone and serves as the main support structure for the bone. The diaphysis is crucial for the overall strength and stability of the humerus, and it contains the medullary cavity where bone marrow is housed.

The proximal end refers to the upper part of the humerus, where it connects to the shoulder joint, while the distal end refers to the lower part, which connects to the elbow joint. Both of these regions are important for joint articulation and movement but do not represent the middle section of the bone. The epiphysis refers to the ends of the bone, which are involved in joint formation and covered by articular cartilage, further distinguishing it from the diaphysis. Thus, understanding these terms helps clarify the specific anatomy of the humerus and the role of each region.