It is devoid of secretory glands and has a cornified stratified epithelium, which resembles horny skin.
2.
This epithelium commences very abruptly at the cardiac orifice, where there is a sudden transition from the stratified epithelium of the esophagus.
3.
The medial, concave area of the lumen is lined with a pseudo stratified epithelium that has three main cell types : receptor cells, supporting cells, and basal cells.
4.
In humans, these alterations are less apparent, as they occur during fetal development-the same changes in the skin, for example, occur between weeks 9 and 24 of gestation ( see-the tadpole-like epithelium is periderm, beneath which a thick stratified epithelium forms, followed by apoptosis of the periderm ).
5.
By layer, epithelium is classed as either simple epithelium, only one cell thick ( unilayered ) or stratified epithelium as stratified squamous epithelium, stratified cuboidal epithelium, and stratified columnar epithelium that are two or more cells thick ( multi-layered ), and both types of layering can be made up of any of the cell shapes.
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