Specialized veins in the submucosa of the equine ileocecal junction.
Spirally arranged bundles of sub-endothelial smooth muscle enfold the small to medium-sized submucosal veins in the equine ileocecal junction. The muscle bundles, accompanied by the endothelial lining, bulge into the lumen of the vessels, partly occluding the latter. Transmission electron microscopy of the muscle cells reveals features consistent with vascular smooth muscle ultrastructure. It is proposed that the throttling effect of the muscle bundles causes engorgement of the submucosal venous plexus, which then assists in the closing of the ileocecal orifice.
Kotzé
S H
SH
Department of Anatomy, Faculty of Veterinary Science, University of Pretoria, Republic of South Africa.
Soley
J T
JT
D000818:Animals; D002432:Cecum / Q000098:blood supply*; D002462:Cell Membrane / Q000648:ultrastructure; D003593:Cytoplasm / Q000648:ultrastructure; D004730:Endothelium, Vascular / Q000166:cytology / Q000648:ultrastructure; D005260:Female; D006736:Horses / Q000033:anatomy & histology*; D007082:Ileum / Q000098:blood supply*; D007413:Intestinal Mucosa / Q000098:blood supply*; D008297:Male; D008854:Microscopy, Electron; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000648:ultrastructure; D015388:Organelles / Q000648:ultrastructure; D014680:Veins / Q000166:cytology / Q000648:ultrastructure