Which term is the central shaft region of a long bone?

Which term is the central shaft region of a long bone?

• A. Diaphysis
• B. Epiphysis
• C. Endosteum
• D. Haversian canal

Answer: (A)

The shaft region of a long bone is called the diaphysis. It’s the long, cylindrical portion made mainly of compact bone that surrounds the central medullary (marrow) cavity, giving the bone its strength with light weight. The ends of the bone are the epiphyses, which articulate with other bones and often have more spongy bone. The inner lining is the endosteum, which coats the medullary cavity and interior surfaces of the bone. A Haversian canal is a small vessel-containing channel inside each osteon of compact bone, essential for blood supply, but it isn’t the name for the shaft itself.

The shaft region of a long bone is called the diaphysis. It’s the long, cylindrical portion made mainly of compact bone that surrounds the central medullary (marrow) cavity, giving the bone its strength with light weight. The ends of the bone are the epiphyses, which articulate with other bones and often have more spongy bone. The inner lining is the endosteum, which coats the medullary cavity and interior surfaces of the bone. A Haversian canal is a small vessel-containing channel inside each osteon of compact bone, essential for blood supply, but it isn’t the name for the shaft itself.