Veterinary Histology and Embryology

TRANSITIONAL EPITHELIA

• This epithelium is seen in the mucous membrane of the excretory passages of the urinary system.
• The cells are often divided into three groups: the basal polyhedral cells, the intermediate pear shaped or pyriform cells with their broad, end towards the free surface and flattened or umbrella like surface squamous cells.
• This epithelium accommodates itself to cover larger or small areas. Completely covering the small areas; cells are six or more layers. Covering a large area, the cells may be two or three layers only.
• The cells are held together by viscous cement which permits gliding over of cells on one another.

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