Which of the following is NOT a layer of the skin?

The endodermis is the layer that is incorrectly identified as a skin layer. Instead, it is a part of plant anatomy, specifically related to root structure. In human skin, the organ consists of three primary layers: the epidermis, which is the outermost layer providing a protective barrier; the dermis, which lies beneath the epidermis and contains connective tissue, blood vessels, and hair follicles; and the hypodermis, also known as subcutaneous tissue, which anchors the skin to underlying structures and contains fat and connective tissue.

Understanding the layers of the skin is crucial as each plays a specific role in protection, sensation, and thermoregulation. The epidermis is responsible for preventing water loss and protecting against environmental factors. The dermis provides strength and elasticity, while the hypodermis aids in insulation and cushioning.