What are the two main divisions of skin?

The two main divisions of the skin are the epidermis and the dermis.

Epidermis: The epidermis is the outermost layer of the skin. It is composed of keratinized stratified squamous epithelium, which means that it is made up of multiple layers of cells that are closely packed together and contain the protein keratin. The epidermis is responsible for protecting the body from the outside environment, preventing water loss, and producing vitamin D.

Dermis: The dermis is the inner layer of the skin. It is composed of connective tissue, which is a type of tissue that contains cells and fibers. The dermis provides strength and flexibility to the skin, and it also contains blood vessels, nerves, and hair follicles.