NEET PG DENTAL EXAM

Detailed explanation-1: -Compact bone tissue forms the outer layer of all bones while spongy or cancellous bone forms the inner layer of all bones. Spongy bone tissue does not contain osteons.

Detailed explanation-2: -Compact bone consists of closely packed osteons or haversian systems. The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix.

Detailed explanation-3: -Like short bones, flat bones have walls that are made of compact bone and a center of spongy bone (with red bone marrow) that forms something like a sandwich. The cranial bones, scapula (shoulder blade), sternum (breast bone), ribs, and iliac bone (hip) are all flat bones.