Movements of Small Intestine

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By: doctorsamadkhan (19 month(s) ago)

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Movements of Small Intestine:

Movements of Small Intestine Husan Bano Associate Professor Department of. Physiology Al- Tibri Medical college and hospital ISRA University

Learning Objectives:

Learning Objectives By the end of this lecture, the students should be able to: d escribe the functional parts of small intestine . e xplain the small intestinal motility enlist 3 characteristics of the small intestine which increase the surface area.

Functional Parts Of Small Intestine:

F unctional Parts Of S mall Intestine Small intestine is approx. 6 meter in length. It has three segments Duodenum Jejunum Ileum

Functional Parts Of Small Intestine:

F unctional Parts Of Small Intestine 1. Duodenum: Initial C-shaped structure is called Duodenum Only few cms in length. Mainly concerned for digestion

Functional Parts Of Small Intestine:

F unctional Parts Of Small Intestine 2. Jejunum: Middle part of small intestine is called Jejunum more than 2 meters in length. Mainly concerned for absorption .

Functional Parts Of Small Intestine:

F unctional Parts Of Small Intestine 3. Ileum: Distal end of small intestine is called Ileum . M ore than 3 meters in length. Concerned for digestion and absorption.

Types of Movements In Small Intestine:

Types of Movements In Small Intestine Three t ypes of movements seen In Small Intestine. Mixing movements OR Segmentation movements. 2. Movements of Villi Peristalsis movements OR Propulsive movements.

1: Mixing Or Segmentation movements:

1: Mixing Or Segmentation movements When chyme enter into small intestine, its wall distended. Distention of muscular wall, myentric plexus stimulated. Due to Stimulation of myentric plexuses, small constrictions appear ( about 1 cm in length) through out the length of small intestine.

1: Mixing Or Segmentation movements:

1: Mixing Or Segmentation movements So a ring like segments appears. After few sec. the dilated area becomes constricted and constricted area becomes dilated which chopped the chyme and mixed with digestive juices.

Mixing Or Segmentation movements:

Mixing Or Segmentation movements

SEGMENTATION MOVEMENT:

SEGMENTATION MOVEMENT

Mixing Or Segmentation movements:

Mixing Or Segmentation movements Rate of segmentation contractions in duodenum is about 7-12 times/ minute In terminal ileum it is 9 times / minute Chyme take 3-5 hours to move through the intestine

2: Movements of Villi :

2: Movements of Villi

2: Movements of Villi:

2: Movements of Villi Villi present in jujenal mucosa. Increases surface area for absorption about 10 folds. Have 2 types of movements .

2: Movements of Villi:

2: Movements of Villi Two types of movements Lashing movements Shortening movements These movements seen constantly, fairly and quickly with irregular intervals .

3: Peristalsis or Propulsive Movements:

3: Peristalsis or Propulsive Movements When most food is absorbed, segmentations cease. Replaced by propulsive movements which propel unabsorbed residue from small intestine to large intestine. Between meal these movements consists of weak, repetitive, peristaltic waves , that move a short distance & die

3: Peristalsis or Propulsive Movements:

3: Peristalsis or Propulsive Movements Each contraction sweeps remnants of undigested food plus mucosal debris & bacteria. Hormone motilin regulates the propulsive movement.

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