Chapter 13. Skin

A. Introduction

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Image courtesy of W. Berman at

The Integumentary System

The Human integumentary system consists of the skin and its derivatives, which include hair and hair follicles, nails and nail beds, sweat glands, sebaceous glands, and mammary glands. The principal function of the organs of the integumentary system is to be a barrier that waterproofs the body. helps protect the body from infection and from ultra-violet radiation from the sun. It prevents water loss, excretes wastes and is involved in thermoregulation. And its rich sensory innervation enables it to serve as matrix for sensation. In Humans and many other most terrestrial mammals, the skin also serves as a source of sunlight-induced vitamin D synthesis.

In this week's laboratory session, we will microscopically study thin skin and some of the skin derivatives.