MadSci Network: Anatomy |
Dear Dalonna,
As you know,the skin is the largest organ of the body. It is our major
interface with the environment and is composed of specialized epithelial
and connective tissue cells.These specialized cells have many protective
and synthetic functions.
Functions of the skin acts as a barrier against such things as water
loss/entry, chemicals, bacteria and fungic as well as against minor
trauma.
In detail,our skin is made of two distinct regions each composed of
sublayers:
1) The superficial region is called the epidermis which literally
means "upon the dermis"- dermas is the Greek word for skin-.This
superficial region varies in thickness across the body's surface. Thick
skin covers the palms of the hands, soles of the feet and the fingertips
and thin skin covers the remainder of the body's surface. The outermost
epdermal layer is the stratum corneum, which is continually sloughed off
and regenerated.
2) The deeper layer of the skin is called the dermis. It contains
two loosely organized regions known as the papillary area and reticular
regions. These regions resist tearing and provide the skin with
elasticity so that our wrinkles are minimized. ( Thank goodness for this
wrinkle resistant region! )
Beneath the dermis is the subcutanous fat (hypodermis), a thermal barrier
and mechanical cushion which varies in thickness from person to person and
in various anatomic sites.
Why this difference in thickness? Just think of all the rough treatment
you give these thick skinned areas!
hope this helped
Maria
Try the links in the MadSci Library for more information on Anatomy.