Digestive System Part III

Digestive System Part III - Small Intestine Most digestion...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Small Intestine Most digestion occurs here, therefore, it is specifically designed for absorption. Long length provide a large surface area modification of the wall further increases surface area (plicae [circulare folds] , villi, and microvilli). Average dimension is 1 inch in diameter and 21 feet in length ( in cadaver and 10 ft in living person). Gross Anatomy The small intestine is divided into three parts: one immobile and two mobile. Duodenum- the first portion and the shortest part of the SI, about 10 inches long. It has a “C” shaped curve that begins at the pyloric spinchter of the stomach and merges with the jejunum. It lies behind the parietal peritoneum and is the most fixed portion of the SI. Gross Anatomy(cont.) The jejunum and ileum are the remaining mobile portions of the SI that are suspended from the posterior abdominal wall by a double-layered fold of peritoneum, called mesentary . This supporting tissue contain the blood vessels, nerves, and lymphatic vessels that supply the intestinal wall. Jejunum - approximately 2/5 (3 ft.) of the remainder of the SI. Ileum - makes up the remaining 6-7 ft. of the SI. The terminal portion of the ileum empties into the medial side of the cecum (first portion of the large intestine) through the ileocecal valve. Micro Anatomy
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

Digestive System Part III - Small Intestine Most digestion...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online