𝐇𝐚𝐢𝐫 is consist of columns of dead keratinized cells.

It has three layers: A central 𝗺𝗲𝗱𝘂𝗹𝗹𝗮, or core (not seen in fine hairs), is surrounded by a keratinized 𝗰𝗼𝗿𝘁𝗲𝘅, and the outer third layer, which is highly keratinized and forms the thin hard 𝗰𝘂𝘁𝗶𝗰𝗹𝗲 on the outside of the hair. These keratinized layers are made by proliferating cells in the hair matrix at the base of the hair follicle.

The 𝐬𝐜𝐚𝐥𝐩 covers the surface of the head, which extends from the top of the forehead across to the epicranial aponeurosis of the head. Laterally, it reaches down to the external auditory meatus and zygomatic arch (cheekbone of the skull). The scalp consists of 5 distinct layers: the skin, connective tissue, epicranial aponeurosis, loose connective tissue, and pericranium (periostium).

𝐏𝐚𝐥𝐦𝐚𝐫 𝐬𝐤𝐢𝐧, together with plantar skin, is thicker than the body’s other skin. It is consist of a stratum lucidum that appears lucid or clear. Moreover, it is a smooth, clear, thin layer, just superficial to the stratum granulosum. The keratinocytes in this layer are derived from the stratum granulosum and mainly consist of keratin fibers. They are flat and densely packed.

Sources:
Histology Guide (n.d.) Hair. Retrieved from https://www.histology.leeds.ac.uk/skin/hair.php

Baxter, R. (2022). Scalp and hair histology. Retrieved from https://www.kenhub.com/en/library/anatomy/histology-of-the-scalp-and-the-hair

Organ Level — Skin (Epidermis and Dermis) Retrieved from https://courses.lumenlearning.com/cuny-csi-ap-1/chapter/organ-level-skin-epidermis-and-dermis/