American Academy of Professional Coders (AAPC) Practice Exam

Which of the following is a function of the hypodermis?

1. Regulates hydration

2. Provides sensation

3. Anchors skin to underlying musculature

4. Enables skin healing

The correct answer is: Anchors skin to underlying musculature

The hypodermis, also known as the subcutaneous layer, plays a significant role in anchoring the skin to the underlying structures of the body, particularly the muscles and bones. It is composed mainly of loose connective tissue and fat cells, which not only help to stabilize the position of the skin but also allow for some movement. This anchoring function is essential for maintaining the integrity of the skin as it serves as a cushion that absorbs shock and protects underlying tissues. In contrast, while the hypodermis can have some role in hydration through the fat cells providing insulation, the primary function in skin hydration is more closely associated with the epidermis and the secretion of oils by sebaceous glands. Similarly, sensation is primarily attributed to specialized nerve endings present in the dermis rather than the hypodermis. Although the hypodermis can play a supportive role in the healing process of skin, it is not specifically designated as a primary function of this layer, as regeneration and healing are mainly governed by the epidermal and dermal layers above it.