Which skin layer contains sensory nerves, blood vessels, and hair follicles?

The correct choice is the dermis, as it is the layer of skin that houses a variety of important structures crucial for skin function and sensation. The dermis is situated beneath the epidermis and is composed primarily of connective tissue, which provides strength and elasticity to the skin.

This layer is rich in sensory nerve endings, which allow for the perception of touch, pain, and temperature. It also contains blood vessels that supply nutrients and oxygen to the skin, as well as hair follicles where hair growth originates. Additionally, the dermis includes glands (such as sweat and sebaceous glands) that play roles in thermoregulation and skin lubrication.

In contrast, the stratum corneum is the outermost layer of the epidermis, primarily composed of dead skin cells and lacks blood vessels and hair follicles. The epidermis itself is the outer layer of skin, mainly responsible for providing a barrier against environmental factors, but it does not contain blood vessels or hair follicles; instead, it depends on the dermis for these components. The hypodermis, or subcutaneous layer, is the deepest layer that consists largely of fatty tissue and provides insulation and cushioning but is not part of the skin structure that contains sensory nerves or follicles.