Which layer of the skin contains blood vessels and nerve endings?

• A. Epidermis
• B. Dermis
• C. Hypodermis
• D. Subcutaneous layer

Answer: (B)

The dermis is the layer of skin that contains blood vessels and nerve endings, making it essential for providing nutrients to the skin and facilitating sensory perception. This layer lies beneath the epidermis and is composed of connective tissue, which houses not only blood vessels but also lymphatic vessels, hair follicles, and various glands (such as sweat and sebaceous glands). The presence of nerve endings in the dermis allows for sensations such as touch, pain, and temperature to be transmitted to the nervous system, contributing to our ability to interact with and respond to our environment.

In contrast, the epidermis is primarily composed of keratinized cells and lacks blood vessels and nerve endings, which is why it is considered an avascular layer. The hypodermis, or subcutaneous layer, primarily functions as an insulating layer and does contain blood vessels, but it is not classified as part of the skin itself, which is why the dermis is the correct choice. The subcutaneous layer primarily supports the skin and connects it to underlying structures, rather than actively participating in skin functions such as sensation or blood supply.