What are the primary layers of the skin?

The primary layers of the skin include the epidermis, dermis, and hypodermis.

The epidermis is the outermost layer and serves as the first line of defense against environmental factors such as pathogens and UV radiation. It is composed mainly of keratinocytes and also contains melanocytes, which produce melanin, contributing to skin color and protection against sun damage.

Beneath the epidermis lies the dermis, which is thicker and provides structural support. It contains collagen and elastin fibers that give the skin strength and elasticity. The dermis houses important components such as blood vessels, hair follicles, sweat glands, and sensory receptors.

The hypodermis, also known as subcutaneous tissue, is the deepest layer and acts as an insulating layer while connecting the skin to the underlying muscles and bones. It is primarily composed of fat and connective tissue.

In contrast, some of the other options listed refer to structures or layers that do not encapsulate the main layers of the skin in a correct and complete manner; for example, the basal layer refers to a specific part of the epidermis rather than a standalone layer, and the stratum corneum is also part of the epidermis rather than a separate layer. Therefore,