1 All Physician Training licenses expire on August 31, 2015, are good for three years, and can only renew once (for a total of six years). 2  All Physician Assistant licenses expire on January 31 of even-numbered years.  All Anesthesiologist Assistant licenses expire on January 31 of even-numbered years.
The epidermis is the uppermost or epithelial layer of the skin. It acts as a physical barrier, preventing loss of water from the body, and preventing entry of substances and organisms into the body. Its thickness varies according to body site. The epidermis consists of stratified squamous epithelium.
epidermis. n. 1. (Biology) Also called: cuticle the thin protective outer layer of the skin, composed of stratified epithelial tissue. 2. (Anatomy) the outer layer of cells of an invertebrate.3. (Botany) the outer protective layer of cells of a plant, which may be thickened by a cuticle.tratum granulosum-the layer of epidermis just under the stratum corneum or (on the palms and soles) just under the stratum lucidum; contains cells (with visible granules) that die and move to the surface. malpighian layer, rete Malpighii, stratum basale, stratum germinativum-the innermost layer of the epidermis.