NEET PG DENTAL EXAM

Detailed explanation-1: -(a) Osteoblasts and Osteocytes (Figs. 9.2, 9.6, 9.7). Osteoblasts are the cells which secrete the bone matrix. They are typically of an ovoid shape, with slender cytoplasmic processes extending from them into contact with those of adjacent cells.

Detailed explanation-2: -Bone and cartilage, like all other connective tissues, consist of cells and extracellular matrix. It is the ground substance of the matrix which is most responsible for the conspicuous differences between bone and cartilage. The ground substance of bone is mineralized, making the bone rigid and strong, but brittle.

Detailed explanation-3: -At the end of a bone formation cycle, a subpopulation of osteoblasts becomes osteocytes incorporated into the bone matrix.

Detailed explanation-4: -About 90% of the organic component of the bone matrix is due to the type I collagen that is secreted by the osteoblasts and osteocytes. The ground substance is the nonfibrillar organic component of the bone matrix and it fills the space around the collagen fibrils and hydroxyapatite crystals.