What is subcutis primarily composed of?

The subcutis, also known as the hypodermis, is primarily composed of subcutaneous fat. This layer of tissue is located beneath the skin and serves several important functions. It acts as an insulator to help regulate body temperature, provides cushioning to protect underlying structures such as muscles and bones, and serves as an energy reserve. The presence of fat in the subcutis also contributes to the overall appearance and shape of the body.

While connective tissue is present in the subcutis, it is not the predominant component; rather, the fat cells, or adipocytes, are most abundant. This is why the correct answer highlights subcutaneous fat as the main constituent of the subcutis. Understanding the anatomy and composition of the subcutis is essential for students of athletic training, as it relates to injury prevention, management, and recovery.