The vascularization of the Bursa cloacalis (of Fabricius) in the duck.
The morphological and structural features of the vascular component of the bursa of Fabricius in the duck are described. By means of an intravasal perfusion of suitably colored neoprene Latex or Microscopaque, or a perfusion of Indian ink, it was possible to follow visually the routes of arteries, veins and the microcirculation; this last represents a major characteristic of the bursal follicle in the duck. The microcirculation has its origins in several roots arising from the follicular arterioles, which in the region of the cortex constitute an open vascular layer. From these pre-capillary arterioles, adjacent to the limiting layer between cortex and medulla, a dense capillary network is formed. With the aid of an electron microscope the presence of a cortico-medullary barrier of an epithelio-reticular nature was revealed; close to it there are the terminal branches of the intrafollicular network. The barrier appears to be structurally more compact than that of the cortical capillaries of the mammalian thymus.
Scala
G
G
Caputo
G
G
Paino
G
G
Pelagalli
G V
GV
D000818:Animals; D002060:Bursa of Fabricius / Q000098:blood supply* / Q000648:ultrastructure; D004372:Ducks / Q000033:anatomy & histology*; D005260:Female; D008297:Male; D008833:Microcirculation; D008854:Microscopy, Electron