Final answer:
The hypodermis, also known as the subcutaneous tissue, is a true layer of connective tissue beneath the dermis that provides fat storage, insulation, and protection. It contains adipose tissue, is vital for lipid storage, and it is not considered part of the skin, despite being connected to it.
Step-by-step explanation:
The statement that the hypodermis is also known as subcutaneous tissue is true. The hypodermis, which is also referred to as the subcutaneous layer or superficial fascia, is a layer that resides just below the dermis. It serves several vital functions, such as connecting the skin to the underlying fascia of bones and muscles, fat storage, insulation, and cushioning for the integument. The hypodermis is composed of well-vascularized, loose, areolar connective tissue and adipose tissue, allowing it to serve effectively as an energy reserve while regulating body temperature and protecting underlying structures from trauma.
Lipid storage is a major role of the hypodermis, as it houses the majority of adipocytes - the fat-storing cells within the body. These adipocytes are significant in terms of weight management, as they store fat that can be utilized as energy, insulate the body, and offer protection. The distribution of this stored fat can be influenced by a variety of hormonal and genetic factors, and can vary between sexes and as individuals age.
Importantly, though the hypodermis is connected to the skin layers, it is not technically considered part of the skin. Human skin is primarily composed of two layers: the epidermis and the dermis. These two layers sit on top of the hypodermis, which connects the skin to the underlying tissue and organs. Furthermore, the hypodermis plays no role in supplying blood vessels to the epidermis, which is primarily avascular, meaning that it has no blood supply of its own.