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Longitudinal section of duodenum; valvulae conniventes cut across, showing relation of these folds to villi.

Longitudinal Section of Duodenum

Longitudinal section of duodenum; valvulae conniventes cut across, showing relation of these folds to…

A vertical section of the duodenum, highly magnified. Labels: 1, a fold-like villus; 2, epithelium, or cuticle; 3, orifices of intestinal glands; 5, orifices of duodenal glands; 4, 7, more highly magnified sections of the cells of the duodenal gland.

A Magnified Section of the Duodenum

A vertical section of the duodenum, highly magnified. Labels: 1, a fold-like villus; 2, epithelium,…

The mucous membrane of the ileum. Labels: 1, cellular structure of the epithelium, or outer layer; 2, a vein; 3, fibrous layer; 4, villi covered with epithelium; 5, a villus partially uncovered; 7, a villus stripped of its epithelium; 8, lymphatics or lacteals; 9, orifices of the glands opening between the villi; 10, 11, 12, glands; 13, capillaries surrounding the orifices of the gland.

Mucous Membrane of the Ileum

The mucous membrane of the ileum. Labels: 1, cellular structure of the epithelium, or outer layer; 2,…

An intestinal villus. They are little projections of the mucous membrane, covered with epithelium, and containing blood-vessels and lacteals, and are arranged for absorbing nutrients in the intestines. Labels: a, a, a, columnar epithelium; b, b, capillary network; c, c, lymphoid tissue and longitudinal muscles fibers; d, lacteal vessel.

Intestinal Villus

An intestinal villus. They are little projections of the mucous membrane, covered with epithelium, and…

"A tiny block cut from the wall of the intestine showing villi and the mouths of glands at a; b, villus cut open to show the lacteal e and blood tubes m for absorbing food." —Davison, 1910

Section of Intestine wall

"A tiny block cut from the wall of the intestine showing villi and the mouths of glands at a; b, villus…

Transverse section of small intestine (lower part of duodenum), showing general arrangement of coats.

Transverse Section of Small Intestine

Transverse section of small intestine (lower part of duodenum), showing general arrangement of coats.

Mucosa of small intestine in idea vertical cross section

Wall of Small Intestine

Mucosa of small intestine in idea vertical cross section

The mucous membrane from the jejunum. Labels: 1, Villi (folds of lining mucous membrane) in miniature. 2, Tubular glands: their orifices. 3, Opening on the free surface of the mucous membrane. 4, Fibrous tissue.

Mucous Membrane from the Jejunum

The mucous membrane from the jejunum. Labels: 1, Villi (folds of lining mucous membrane) in miniature.…

Portion of the mucous membrane from the small intestine, magnified, showing the villi on its free surface, and between them the orifices of the tubular glands. Labels: 1, Portion of a clustered gland. 2, A solitary gland. 3, Fibrous tissue.

A Portion of the Mucous Membrane from the Small Intestine

Portion of the mucous membrane from the small intestine, magnified, showing the villi on its free surface,…

Vertical section of the intestinal mucous membrane of the rabbit. Two villi are represented, in one of which the dilated lacteal alone is shown, in the other the blood vessels and lacteal are both seen injected, the lacteal white, the blood vessels dark; a, the lacteal vessels of the villi; a', horizontal lacteal, which they join; b, capillary blood vessels in one of the villi; c, small artery; d, vein; e, the epithelium covering the villi; g, tubular glands or crypts of Lieberkuhn, some divided down the middle, others cut more irregularly; i, the submucous layer. A, cross-section of three tubular glands more highly magnified.

Rabbit's Intestinal Mucous Membrane

Vertical section of the intestinal mucous membrane of the rabbit. Two villi are represented, in one…

Villi of the small intestine, magnified about 80 diameters. In the left-hand figure the lacteals, a,b,c, are filled with white injection; d, blood-vessels. In the right-hand figure the lacteals alone are represented, filled with a dark injection. The epithelium covering the villi, and their muscular fibers are omitted.

Small Intestine Villi

Villi of the small intestine, magnified about 80 diameters. In the left-hand figure the lacteals, a,b,c,…

"<em>A, B,</em> glands seen in vertical section with their orifices at <em>C</em> opening upon the membrane between the villi; <em>D</em>, villus." &mdash; Blaisedell, 1904

Glands and villi of the small intestine

"A, B, glands seen in vertical section with their orifices at C opening upon the membrane…

"Piece of small intestine cut open to show wrinkling of inner coat bearing villi." &mdash;Davison, 1910

Piece of small intestine

"Piece of small intestine cut open to show wrinkling of inner coat bearing villi." —Davison, 1910

Piece of the small intestine cut open to show wrinkling of inner coat bearing villi.

Villi of Small Intestine

Piece of the small intestine cut open to show wrinkling of inner coat bearing villi.

Transverse section of small intestine (jejunum), showing villi cut lengthwise.

Transverse Section of Villi of Small Intestine

Transverse section of small intestine (jejunum), showing villi cut lengthwise.

Villi of the small intestine. Villa are minute, vascular processes which project from the mucous membrane of the small intestine throughout its whole extend, giving to its surface a velvety appearance.

Villi of the Small Intestine

Villi of the small intestine. Villa are minute, vascular processes which project from the mucous membrane…

Villi of the small intestine; magnified about 80 diameters. In the right hand figure the lacteals, a, b, c, are filled with white injection; d, blood vessels. In the left-hand figure the lacteals alone are represented, filled with a dark injection. The epithelium covering the villi, and their muscular fibers, are omitted.

Villi of the Small Intestine

Villi of the small intestine; magnified about 80 diameters. In the right hand figure the lacteals, a,…

Vill of the small intestine.

Villi of the Small Intestine

Vill of the small intestine.

Villi of small intestine.

Villi of the Small Intestine

Villi of small intestine.

"Ideal section, greatly enlarged, showing minute capillary circulations." &mdash;Brown, 1884

Villus

"Ideal section, greatly enlarged, showing minute capillary circulations." —Brown, 1884

Section of the villus of a rat killed during fat absorption. Labels: ep, epithelium; str, striated border; c, lymph cells; c', lymph cells in the epithelium; l, central lacteal containing disintegrating lymph corpuscles

Villus of a Rat

Section of the villus of a rat killed during fat absorption. Labels: ep, epithelium; str, striated border;…

A, Villus of sheep. B, Villi of human.

Villus of Humans and Sheep

A, Villus of sheep. B, Villi of human.

Transverse section of single intestinal villus, showing relation of epithelium, stroma, and vessels.

Transverse Section of Villus of Small Intestine

Transverse section of single intestinal villus, showing relation of epithelium, stroma, and vessels.