Identifying Epithelium
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This document provides an overview of epithelium, including its characteristics, cell shapes, criteria used to identify it, key features like polarity, and examples of different types. The principal layers of skin are described as the epidermis and dermis. Various epithelial layers within the epidermis are defined, as are the two layers of the dermis. Examples of simple and stratified epithelia are given along with images to illustrate cell shapes and tissue organization. Specialized epithelial tissues like glands and hair follicles are also mentioned.
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Identifying Epithelium
- 1. Introduction to identifying epithelium
- 8. Stratum corneum Stratum granulosum Stratum spinosum Slide of stratified, keratinized epithelium showing epidermal layers
Editor's Notes
- http://www.siumed.edu/%7Edking2/intro/skin.htm#layers Stratum corneum. Cells of the cornified layer are dead, protective keratinized "squames", eventually sloughed off. - Stratum granulosum. Cells in the granule-cell layer accumulate keratohyalin , visible as darkly stained granules. The presence of this layer is diagnostic for keratinized stratified squamous epithelium. - Stratum spinosum. Cells of the "prickle-cell" layer are attached to one another by desmosomes ("spines") and reinforced by tonofilaments. These cells gradually move outward as new cells are formed from the basal layer (below). - Stratum basale / stratum germinativum. Cells of the basal layer are attached to the basement membrane (dashed line) by hemidesmosomes. When a basal cell divides, one of the daughters migrates upward to replenish outer layers of cells.