Page 282 - Veterinary Histology of Domestic Mammals and Birds, 5th Edition

264 Veterinary Histology of Domestic Mammals and Birds

VetBooks.ir · a capillary tuft (glomerulus) between the afferent Species variation
Birds: The renal corpuscles are smaller, but consider-
and efferent arteriole,
· a double-walled capsule (Bowman’s capsule, cap-
ably more numerous, than in mammals.
sula glomeruli) comprising:
− an outer parietal layer of simple squamous Capillary tuft (glomerulus)
epithelium,
− an inner visceral layer composed of podocytes, The afferent and efferent arterioles enter and exit the
− a urinary space between the two capsular layers, renal corpuscle at the vascular pole (located opposite the
· intraglomerular mesangial cells and connective tis- urinary pole). Thus, the capillary network of the renal
sue and corpuscle begins and ends at the vascular pole. The effer-
ent arterioles are continued by the peri-tubular capillary
· a vascular and a urinary pole.
network in the cortex and medulla.

Proximal tubule

Distal tubule

Vascular pole
Bowman’s capsule
(outer layer)

Urinary space

Glomerulus

Urinary pole

12.10 Glomerulus and Bowman’s capsule with macula 12.11 Renal corpuscle with vascular and urinary poles
densa (dog). Goldner’s Masson trichrome stain (x800). (dog). Haematoxylin and eosin stain (x800).

Proximal
convoluted
tubule
Juxta-
medullary renal
corpuscle

Medulla

12.12 Renal corpuscle with juxtaglomerular apparatus 12.13 Transition from renal cortex (with juxtaglomer-
(dog). PAS stain (x450). ular renal corpuscles) to medulla (dog). Haematoxylin
and eosin stain (x70).

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