GENERAL HISTOLOGY

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: -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). In the adult, only the metaphysis and diaphysis are present (Figure 1).

Detailed explanation-3: -Epiphysis consists of the red bone marrow which produces erythrocytes (RBC). The ends of long bones are separated by a long shaft called the diaphysis. The diaphysis is composed of cortical bone and consists of bone marrow and adipose tissue. Primary ossification occurs in the diaphysis.

Detailed explanation-4: -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.