The microscopic vascular pattern of the ruminal wall of the sheep was studied by
means of an India ink injection method followed by clarification in methyl salicylate.
Both the epithelium and the tunica muscularis receive blood from a submucosal
arterial plexus. Venules arise from the lower regions or bases of the papillae as well
as from an inter-muscular plexus. These join the submucosal venous plexus. The
sub-epithelial capillary flow is from the tips of the papillae toward their bases. Submucosal
arterio-venous anastomoses were identified in serial sections.