MEDICAL PHYSIOLOGY

Detailed explanation-1: -The diaphysis is the main or midsection (shaft) of a long bone. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat).

Detailed explanation-2: -A long bone has two parts: the diaphysis and the epiphysis. The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The hollow region in the diaphysis is called the medullary cavity, which is filled with yellow marrow.

Detailed explanation-3: -The long bone in a child is divided into four regions: the diaphysis (shaft or primary ossification centre), metaphysis (where the bone flares), physis (or growth plate) and the epiphysis (secondary ossification centre).

Detailed explanation-4: -Most of the diaphysis is formed by compact cortical bone, whereas the inside of the metaphysis and the epiphysis, as well as of short tubular and flat bones contains trabecular (cancellous) bone tissue.

Detailed explanation-5: -The diaphysis plays an essential role in the structural functionality, the transport of oxygen and immune support, and mineral and fat storage. The medullary cavity, housed within the diaphysis, is where blood products, including red blood cells, white blood cells, and platelets, are formed.