Which epidermal layer consists of a single layer of basal cells?

• A. Stratum corneum
• B. Stratum lucidum
• C. Stratum germinativum
• D. Stratum granulosum

Answer: (C)

The epidermal layer that consists of a single layer of basal cells is known as the stratum germinativum, also referred to as the stratum basale. This layer is critical in the skin's structure as it serves as the foundation for the entire epidermis. It contains a single row of columnar or cuboidal keratinocytes that are continuously dividing, leading to the production of new cells that will eventually move up through the layers of the epidermis.

The stratum germinativum is also where melanocytes, the cells responsible for producing melanin (the pigment that gives skin its color), are located. This layer plays a vital role in skin regeneration and repair, as the basal cells continually proliferate to replenish the outer layers of skin that are shed or damaged.

In contrast, the stratum corneum is the outermost layer of the epidermis, consisting of dead, flattened keratinized cells; the stratum lucidum is a clear layer found primarily in thicker skin areas (like palms and soles), and the stratum granulosum contains cells that are in the process of keratinization and dying as they prepare to become part of the stratum corneum. Each of these layers has distinct characteristics and