What is the primary makeup of the hypodermis?

The hypodermis, also known as subcutaneous tissue, is primarily composed of adipose tissue, which serves several vital functions in the body. This layer lies beneath the dermis and is responsible for providing insulation to regulate body temperature, cushioning to protect underlying structures, and serving as an energy reserve. Adipose tissue consists of fat cells that store energy and help in the synthesis of various hormones, contributing to metabolic processes.

In contrast, collagen fibers are primarily found in the dermis, providing structural integrity and strength to the skin. Epithelial cells are the main type of cells that make up the outer layer of skin (epidermis), and while skeletal muscle is involved in movement and is located under the skin, it is not a component of the hypodermis. The predominance of adipose tissue is what defines the hypodermis and highlights its essential role in both protective and metabolic functions within the body.