The integumentary system comprises skin, and the appendages of skin, such as hair, nails, sweat glands, sebaceous glands, and sensory nerves.
Skin comprises three layers: epidermis, dermis, and hypodermis.
The epidermis is composed of stratified squamous epithelium and is divided into the following five sublayers or strata, listed in order from surface (superficial) to deep are:
- Stratum corneum,
- Stratum lucidum,
- Stratum granulosum,
- Stratum spinosum,
- Stratum germinativum also called stratum basale. The deepest layer is the miotic layer, stratum basale producing daughter cells by mitosis.
Read more about this topic: Head And Neck
Famous quotes containing the word system:
“I have no concern with any economic criticisms of the communist system; I cannot enquire into whether the abolition of private property is expedient or advantageous. But I am able to recognize that the psychological premises on which the system is based are an untenable illusion. In abolishing private property we deprive the human love of aggression of one of its instruments ... but we have in no way altered the differences in power and influence which are misused by aggressiveness.”
—Sigmund Freud (1856–1939)