Blood and lymph vessels in the jejunal villi of the white rat

Abstract

The typical jejunal villus is tongue-or chisel-shaped, in which the lacteal is axial, the artery paraxial and the vein lies near one of the lateral borders. The artery forms a T-junction with the specially wide marginal capillary at the tip which distributes blood to the greater part of the subepithelial capillary plexus. This plexus is so dense that no epithelial cell is more than 30 p away from the blood stream. The higher density of the plexus i n the tip reflects the higher functional capacity of the epithelium there and the plexus in the base of the villus is less dense in keeping with the lower functional capacity of the basal epithelium. The vein begins in a manner which does not suggest the presence of an arterio-venous anastomosis.

Application of the Scanning Electron Microscope to the Study of the Fine Distribution of the Blood Vessels

“…JACOBSON and NOER, 1952;TRABUCCO and MARQUEZ, 1952;HALL, 1955;ELIAS, 1957;TAKAHATA et al, 1957TAKAHATA et al, , 1958HASE and BRIM, 1966;MOHIUDDIN, 1966;REYNOLDS et al, 1967;SAUNDERS, 1969;OKA, 1970;etc. ), scanning electron microscopy is advantageous because of the incomparably larger depth of focus and higher resolution (cf.…”

<b>THE MICROVASCULAR ARCHITECTURE OF RAT PROXIMAL DUODENUM, WITH PARTICULAR REFERENCE TO BRUNNER’S </b><b>GLANDS¹</b>

“…The enlarged, ridge-like compound villi observed occasionally in the duodenum have been reported previously (1,16,17), arising perhaps by fusion of the edges of adjacent villi. The incidence of such villi in man increases with age.…”

Microcirculation of the Rat Small Intestine as Studied by the Injection Replica Scanning Electron Microscope Method

“…Vascular architecture in the intestinal mucosa has been studied by many authors in man (SPANNER, 1932;JACOBSON and NOER, 1952), monkey (REYNOLDS et al, 1967), dog (REYNOLDS et al, 1972), rat (SPANNER, 1932;MOHIUDDIN, 1966), pig (BELLAMY et al, 1973) and other animals. However, owing to the limited or unpersuasive demonstration by the previous light microscope methods using injected sections (JACOBSON and NOER, 1952;NYLANDER and OLERUD, 1961;BELLAMY et al, 1973), falgog specimens (MOHIUDDIN, 1966) or insufficiently casted samples (REYNOLDS et al, 1967(REYNOLDS et al, , 1972, its details, especially the villous microcirculation, are conflicting.…”

“…However, owing to the limited or unpersuasive demonstration by the previous light microscope methods using injected sections (JACOBSON and NOER, 1952;NYLANDER and OLERUD, 1961;BELLAMY et al, 1973), falgog specimens (MOHIUDDIN, 1966) or insufficiently casted samples (REYNOLDS et al, 1967(REYNOLDS et al, , 1972, its details, especially the villous microcirculation, are conflicting. As noted by JACOBSON and NOER (1952), the previous descriptions can be classified into three categories.…”

“…(2) The afferent artery, after reaching the tip of the villus, gives rise to the capillaries which are collected at the base of the villus into the efferent vein (fountain pattern, MALL) (MOHIUDDIN, 1966;BELLAMY et al, 1973). (3) The afferent artery continues at the base of the villus into a tuft of capillaries which converge near the tip of the villus into the efferent vein (tuft view, STOEHR) (REYNOLDS et al, 1967(REYNOLDS et al, , 1972.…”