Wound Care Certified Certification (WCC) Practice Exam

How many layers are present in the epidermis?

1. 3

2. 4

3. 5

4. 6

The correct answer is: 5

The epidermis consists of five distinct layers, each with specific functions that contribute to skin health and integrity. These layers, from deepest to superficial, include the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (present in thick skin), and the stratum corneum. The stratum basale is where cell division occurs, ultimately replenishing the outer layers of the skin. The stratum spinosum provides strength and flexibility due to its desmosomal connections between cells. The stratum granulosum is key for keratinization, where cells begin to lose their nuclei and become more flattened, contributing to the barrier function of the skin. The stratum lucidum is a clear layer found only in thicker skin areas, such as the palms and soles, offering additional protection. Finally, the stratum corneum consists of dead keratinized cells that form a tough outer barrier against environmental damage, water loss, and infection. Understanding these layers is crucial for wound care, as different levels of epidermal damage can significantly affect healing and treatment strategies. Recognizing the importance of each layer also aids in grasping how wounds can impact overall skin function and health.