Where Cutaneous Conditions Occur
The skin weighs an average of 4 kilograms (8.8 lb), covers an area of 2 square metres (22 sq ft), and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. There are two main types of human skin: glabrous skin, the nonhairy skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. Within the latter type, there are hairs in structures called pilosebaceous units, each with hair follicle, sebaceous gland, and associated arrector pili muscle. In the embryo, the epidermis, hair, and glands are from the ectoderm, which is chemically influenced by the underlying mesoderm that forms the dermis and subcutaneous tissues.
Read more about this topic: Cutaneous Conditions
Famous quotes containing the words conditions and/or occur:
“For it is not possible to join serpentine wisdom with columbine innocency, except men know exactly all the conditions of the serpent: his baseness and going upon his belly, his volubility and lubricity, his envy and sting, and the rest; that is, all forms and natures of evil: for without this, virtue lieth open and unfenced.”
—Francis Bacon (1561–1626)
“The greatest events occur without intention playing any part in them; chance makes good mistakes and undoes the most carefully planned undertaking. The world’s greatest events are not produced, they happen.”
—G.C. (Georg Christoph)