Renal Pelvis and calyces are lined by transitional epithelium resting on loose connective tissue proper. The mucularis consists of two ill-defined layers of plain muscle and sphincter-like arrangement of the circular layer is found in each minor calyx at the base of each papilla and at the beginning of the ureter. A connective tissue coat containing fat cells, large blood vessels and nerves covers the muscular coat.
In the horse: Goblet cells occur in the epithelium and tubulo-alveolar mucous gland in the lamina propria of the renal pelvis. A distinct submucosa is present in the horse and the ox.
