What are the three primary layers of the skin?

The three primary layers of the skin are indeed the epidermis, dermis, and subcutaneous (often referred to as the hypodermis). The epidermis is the outermost layer of skin, providing a protective barrier and is primarily composed of keratinized cells. Below that, the dermis contains connective tissue, blood vessels, hair follicles, and sweat glands, contributing to the structural integrity and function of the skin. The subcutaneous layer, or hypodermis, lies beneath the dermis and serves to insulate the body, store fat, and anchor the skin to underlying structures.

Understanding these layers is crucial, as they each serve distinct functions and are composed of different types of cells and tissues that contribute to the skin's overall health and protective abilities. The other choices contain inaccuracies, such as the inclusion of the epididymis, which is a part of the male reproductive system, and terms like "corium" that may refer to the dermis in some contexts but are not commonly used in basic descriptions of skin structure.