Which of the following is considered an appendage of the skin?

The correct choice, the sudoriferous glands, are considered appendages of the skin because they are specialized structures that originate from the skin’s epidermis and extend into the dermis. These glands play a crucial role in thermoregulation and water excretion through the production of sweat.

Appendages of the skin generally include various structures that are derived from the skin itself and are involved in its functions. These include hair follicles, sebaceous (oil) glands, and sudoriferous (sweat) glands. Sudoriferous glands specifically are important for cooling the body and maintaining homeostasis.

In contrast, the dermis and epidermis are layers of the skin itself, not appendages. The subcutaneous layer, also known as the hypodermis, is a layer beneath the skin that primarily consists of fat and connective tissue. While all these components are integral to skin health and function, the term "appendage" specifically refers to structures that arise from the skin itself and serve additional functions.