GENERAL HISTOLOGY

Detailed explanation-1: -The structure of human hair is well known: the medulla is a loosely packed, disordered region near the centre of the hair surrounded by the cortex, which contains the major part of the fibre mass, mainly consisting of keratin proteins and structural lipids.

Detailed explanation-2: -The innermost layer of the hair shaft is named the medulla. It is seen only in large and thick hairs. The middle layer of the hair shaft is called the cortex, made of keratin fibers. The strength, color and texture of a hair fiber are provided by the cortex layer of the hair shaft.

Detailed explanation-3: -Hair is made up of columns of dead keratinised cells. The hair has three layers: A central medulla, or core (not seen in fine hairs), surrounded by a keratinised cortex, and the outer third layer, which is highly keratinised and forms the thin hard cuticle on the outside of the hair.