Microvascular anatomy of the large intestine in adult Xenopus laevis: scanning electron microscopy of vascular corrosion casts and correlative light microscopy.

摘要: The microvascular anatomy of the large intestine adult South African Clawed Toad, Xenopus laevis (Daudin), was studied by scanning electron microscopy (SEM) vascular corrosion casts (VCCs) and correlative light microscopy. Observations showed to be supplied haemorrhoidal artery posterior mesenteric drain via vein into either left or right abdominal vein. Both arteries veins a bipinnate supply/draining pattern with branches running circumferentially. Vessels embraced gut wall while in most cases alternated along length. Many short terminal arterioles arose from circumferential at almost acute angles capillarized after distance. Capillary lengths were continued numerous postcapillary venules which merged leaf vein-like formation rosette-like up four draining sites per supplying arteriole. microvasculature found well adapted 1) sustain blood flow under different amounts feces 2) provide optimal conditions for resorption water salts lumen system high number their conspiciouos patterns.