California Cosmetology Practice Exam

The three primary layers of the skin are the epidermis, dermis, and hypodermis. The epidermis is the outermost layer, providing a protective barrier and playing a critical role in skin color and the formation of new skin cells. It contains various cells, including keratinocytes and melanocytes, which contribute to its functions. Beneath the epidermis lies the dermis, which is a thicker layer composed of connective tissue that provides strength and elasticity. It houses important structures such as hair follicles, sweat glands, and blood vessels, contributing to the skin's resilience and its ability to heal. The hypodermis, or subcutaneous layer, is located beneath the dermis and is composed mainly of fat and connective tissue. This layer helps to insulate the body, protects underlying muscles and bones, and provides a cushion against external shocks. While the other options include components of the skin, they do not correctly identify the three main layers. For instance, stratum corneum specifically refers to a part of the epidermis rather than being a primary layer itself, and terms like 'basal layer' and 'fatty layer' lack specificity in the context of the skin's structural organization.