What Is Subcutaneous Tissue?
Human skin has three layers — the dermis, epidermis, and hypodermis. Each layer has different functions. The deepest layer, the hypodermis, is also known as subcutaneous tissue. This layer is responsible for regulating body temperature. A human’s subcutaneous tissue also protects her inner organs and bones.
Humans’ subcutaneous tissue contains many things, including elastic fibers, nerves, and hair follicle roots. It is often said, however, that the hypodermis consists mainly of adipose tissue. An adipoyte is a fat cell, and the subcutaneous tissue is mainly fat. There are also large blood vessels distributed throughout the tissue. Together, these components create a layer of skin that acts as a type of insulation for the body.
When thinking of insulation, people tend to think of retaining heat. However, humans’ subcutaneous tissue is a full-service temperature regulating mechanism. It generally prevents a person from getting too hot or too cold. It is in this layer that the sweat glands are located. When a person’s body begins to overheat, it is a signal from the subcutaneous tissue that generates sweat to help cool it down.
The insulation provided by this deepest layer of skin is also useful in helping prevent injury. When a person falls or bumps into something, it is this layer of skin that acts as a cushion. By doing so, the hypodermis helps protect the body’s delicate inner organs and bones. However, the subcutaneous tissue becomes thin when a person gets old. This plays a role in many of the changes that can be noted in elderly people’s body temperature and in their tendency to fall more often and be more seriously injured by those falls.
There is a saying that color is only skin deep. Those who wonder how deep may be interested to know that it extends to the hypodermis. In addition to its other functions, this layer of skin plays a role in pigmentation.
In some cases, medicines are said to be given subcutaneously. This usually refers to injections into the hypodermis. This is believed to be the most effective manner to administer some drugs, such as human growth hormones. Just as the subcutaneous tissue can store fat, it can also provide good storage space for drugs that need to be released gradually because there is limited blood flow.
Written by Felicia Dye
