Utah Esthetics Written State Practice Exam

In which layer does skin cell division primarily occur?

1. Stratum Corneum

2. Stratum Basale

3. Stratum Lucidum

4. Stratum Granulosum

The correct answer is: Stratum Basale

Skin cell division primarily occurs in the stratum basale, which is the deepest layer of the epidermis. This layer contains the basal cells that are actively undergoing mitosis (cell division). As new cells are produced, they push older cells upward through the layers of the epidermis. The stratum basale is crucial for maintaining the health and integrity of the skin, as it replenishes the outer layers that undergo constant shedding. The other layers, such as the stratum corneum, stratum lucidum, and stratum granulosum, primarily consist of cells that are either dead or in the process of dying. These upper layers serve protective functions and do not participate in cell division. Thus, understanding the role of the stratum basale is essential in comprehending how the skin renews itself and maintains its barrier functions.