Histology Photomicrographs

Human Anatomy and Physiology (BIOL& 241L-242L)
Karen Hart, Peninsula College

Epithelial tissue: Transitional epithelium

 

Example: A transitional epithelium forms the lining of the bladder.

Slide: Human Bladder
Location: Lining of bladder

Microscope at 400X

Transitional epithelium is a stratified epithelium in which the shape of the surface cells changes (undergoes transitions) depending on the degree of stretch.

When a transitional epithelium is not stretched (for example in an empty bladder) the cells of the surface layers are large and rounded. Arrows labeled c indicate several large rounded cells which have been outlined on the photo.

When a transitional epithelium is stretched (as it would be in a full bladder) the cells of the surface layers are pulled into a flatter shape.

Unlabeled arrows indicate base of the epithelium.

ct = connective tissue
lu = lumen
rbc = red blood cell (stained bright pink in this slide)

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Peninsula College