GENERAL HISTOLOGY

Detailed explanation-1: -Compact bone is the dense, hard, smooth outer part of a bone. It surrounds the medullary cavity and contains blood vessels and nerves. The medullary cavity is the hollow part of bone that contains bone marrow. The bone marrow makes blood cells and stores fat.

Detailed explanation-2: -Spongy bone is found mostly at the ends of bones and contains red marrow. Bone marrow is found in the center of most bones and has many blood vessels. There are two types of bone marrow: red and yellow. Red marrow contains blood stem cells that can become red blood cells, white blood cells, or platelets.

Detailed explanation-3: -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.