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:
“People nowadays have such high hopes of America and the political conditions obtaining there that one might say the desires, at least the secret desires, of all enlightened Europeans are deflected to the west, like our magnetic needles.”
—G.C. (Georg Christoph)
“Usually he has no thoughts—but as an exception to this rule sometimes nasty thoughts occur to him.”
—Friedrich Nietzsche (1844–1900)