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

The dermis is the layer of skin that contains blood vessels, nerves, hair follicles, and glands. This layer is located beneath the outermost layer of skin, known as the epidermis. The dermis plays a crucial role in providing structural support and nourishment to the skin, as it contains connective tissue that helps maintain skin elasticity and strength. Blood vessels in the dermis supply oxygen and nutrients to the skin, while nerve endings provide sensation. Hair follicles in the dermis are responsible for hair growth, and the glands, including sebaceous and sweat glands, help regulate moisture and temperature.

The other layers mentioned—subcutaneous and hypodermis—are often used interchangeably to refer to the layer beneath the dermis, which primarily consists of fat and connective tissue. While the epidermis is the outer layer of skin that acts as a barrier, it lacks the vascular and nerve components found in the dermis.