The Brain Skin

The skin constitutes a protective barrier against physical damage of underlying tissues,
invasion of hazardous chemical and bacterial substances and, through the activity of its
sweat glands and blood vessels, it helps to maintain the body at a constant temperature.
Together with the sweat and oil glands, hairs and nails it forms a set of organs called the
integumentary system.  Figure 2–1 shows a cross-section of the skin and underlying
subcutaneous tissue. The skin consists of an outer, protective layer, the epidermis and an
inner layer, the dermis. While the top layer of the epidermis, the stratum corneum, consists
of dead cells, the dermis is composed of vascularised fibrous connective tissue. The
subcutaneous tissue, located underneath the skin, is primarily composed of adipose tissue
(fat).

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