NEET PG DENTAL EXAM

Detailed explanation-1: -Hair grows by forming new cells at the base of the root. These cells multiply to form a rod of tissue in the skin. The rods of cells move upward through the skin as new cells form beneath them. As they move up, they’re cut off from their supply of nourishment and start to form a hard protein called keratin.

Detailed explanation-2: -Hair follicle stem cells in the epithelial bulge are responsible for the continual regeneration of the hair follicle during cycling. The bulge cells reside in a niche composed of dermal cells. The dermal compartment of the hair follicle consists of the dermal papilla and dermal sheath.

Detailed explanation-3: -The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft. Blood vessels nourish the cells in the hair bulb, and deliver hormones that modify hair growth and structure at different times of life.

Detailed explanation-4: -Hair is made in sac-like structures, called follicles. The follicles are rather simple organs that go through growth and rest phases. They are made of epithelial cells3, continuous with the surface epidermis (outermost skin layer) (Figure 4).