Oregon Esthetician State Board

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How many layers make up the epidermis?

The correct answer is: 5

The epidermis consists of five distinct layers, each with unique functions and characteristics. These layers are, from the bottom to the top: stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (found only in thick skin), and stratum corneum. The stratum basale is where new skin cells are generated, while the stratum spinosum provides strength and flexibility to the skin. The stratum granulosum contributes to the barrier functions of the skin, and the stratum lucidum, which is present in areas of thick skin, provides an additional layer of protection. Finally, the stratum corneum is the outermost layer, composed of dead skin cells that are shed and replaced regularly. Understanding these layers is crucial for estheticians as it helps in assessing skin types, planning appropriate treatments, and addressing various skin conditions effectively.