Page 66 - Veterinary Histology of Domestic Mammals and Birds, 5th Edition

48 Veterinary Histology of Domestic Mammals and Birds

VetBooks.ir Superficial epithelial cell with euchromatic

nucleus
Transitional epithelium in non-distended state

Deeper epithelial cell with denser nucleus

2.19 Bladder, non-distended (dog). Transitional epithelium can be considered a specialised form of stratified
epithelium. While the deeper cells are in constant contact with the basal lamina, the superficial cells lose this
connection (they may be in contact with the base of the epithelium via fine cytoplasmic processes). This epi-
thelium is limited to the urinary passages. Goldner’s Masson trichrome stain (x440).

2.20 Bladder, distended (dog). When a urinary passage undergoes distension, the transitional epithelium may
become considerably reduced in height. The basal epithelial cells become broader, remaining in contact with
the basal lamina. Goldner’s Masson trichrome stain (x440).

Surface of transitional
epithelium
Irregular epithelial cell with
Broad epithelial long cytoplasmic
cell with short,
basally directed cell processes
processes

Basal epithelial Basal lamina
cell – cuboidal Loose connective tissue
or columnar Capillary

2.21 Transitional epithelium (schematic).

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