What are the two layers of the dermis?

The two layers of the dermis are the papillary and reticular layers. The papillary layer is the uppermost layer of the dermis and consists of loose connective tissue. It contains numerous small blood vessels, lymphatics, and sensory neurons that provide nutrients to the epidermis and aid in sensation. This layer is also responsible for the formation of fingerprints due to the dermal papillae that project into the epidermis.

The reticular layer lies beneath the papillary layer and is much thicker, comprised of dense irregular connective tissue. This layer contains larger blood vessels, nerve endings, hair follicles, and the majority of the dermal structures, such as sweat and sebaceous glands. It provides strength and elasticity to the skin due to the abundance of collagen and elastin fibers.

Understanding the structure and function of these two layers is essential for estheticians, as it relates to skin health, aging, and the effects of various treatments on the skin.