PATHOLOGY

Detailed explanation-1: -Hair originates in the hair follicles. These follicles are located in the dermis, which is the skin layer between the epidermis (the surface layer) and the fat layer (also called the subcutaneous layer). Hair follicles are present everywhere on the skin except the lips, palms of the hands, and soles of the feet.

Detailed explanation-2: -Each hair has a hair shaft and a hair root. The shaft is the visible part of the hair that sticks out of the skin. The hair root is in the skin and extends down to the deeper layers of the skin. It is surrounded by the hair follicle (a sheath of skin and connective tissue), which is also connected to a sebaceous gland.

Detailed explanation-3: -This cycle can be divided into three phases: anagen (growth), catagen (transition), and telogen (rest). Anagen growth is the active phase in which the hair follicle takes on its onion-like shape and works to produce the hair fiber. The anagen phase can be further broken down into proanagen and metanagen phases.