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Figure 17.34

Radiograph showing a normal small intestine.

Figure 17.34

Radiograph showing a normal small intestine.

ileum. There is no distinct separation between the jejunum and ileum, but the diameter of the jejunum is usually greater, and its wall is thicker, more vascular, and more active than that of the ileum.

Liver -

Stomach

Transverse colon Greater omentum Mesentery Peritoneal membrane Small intestine

Peritoneal cavity Urinary bladder

Greater Omentum Peritoneal Cavity

Mesentery formed by folds of the peritoneal membrane suspends portions of the small intestine from the posterior abdominal wall.

Figure 17.35

Mesentery formed by folds of the peritoneal membrane suspends portions of the small intestine from the posterior abdominal wall.

Liver

Stomach Gallbladder

Transverse colon underneath

Figure 17.35

Liver

Greater omentum

Mesentarys Over Small Intestine

Figure

The greater omentum hangs like an apron over the abdominal organs.

Greater omentum

Figure

The greater omentum hangs like an apron over the abdominal organs.

The jejunum and ileum are suspended from the posterior abdominal wall by a double-layered fold of peritoneum called mesentery (mes'en-ter"e) (fig. 17.35). The mesentery supports the blood vessels, nerves, and lymphatic vessels that supply the intestinal wall.

A filmy, double fold of peritoneal membrane called the greater omentum drapes like an apron from the stomach over the transverse colon and the folds of the small intestine. If infections occur in the wall of the alimentary canal, cells from the omentum may adhere to the inflamed region and help wall it off so that the infection is less likely to enter the peritoneal cavity (fig. 17.36).

Intestinal gland

Apron Over Stomach Infected

Simple columnar epithelium

Blood capillary network

Intestinal gland

Goblet cells

Figure 17.37

Structure of a single intestinal villus.

Lymph vessel

Figure 17.37

Structure of a single intestinal villus.

Simple columnar epithelium

Blood capillary network

Intestinal gland

Goblet cells

Lymph vessel

Intestinal gland

Apron Over Stomach Infected

Figure

Light micrograph of intestinal villi from the wall of the duodenum (63x).

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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