California Cosmetology Practice Exam 2026 – 400 Free Practice Questions to Pass the Exam

The dermis is the primary layer responsible for the structure of the skin. It sits beneath the epidermis and contains connective tissue, collagen, elastin fibers, and other essential components that provide strength, elasticity, and support to the skin. The dermis is where important structures such as hair follicles, sweat glands, sebaceous glands, blood vessels, and nerve endings are embedded, playing a vital role in the overall function and integrity of the skin.

In contrast, the epidermis is the outermost layer of the skin, primarily responsible for protection and acts as a barrier against environmental factors, but it does not contribute significantly to the structural integrity of the skin. The hypodermis, or subcutaneous layer, lies beneath the dermis and is primarily made up of fat and connective tissue, helping to insulate the body and absorb shock, rather than providing structural support to the skin itself. The stratum corneum, which is the outermost layer of the epidermis, consists of dead skin cells that slough off and also does not contribute to the structural aspects of the skin.