THE HISTOLOGIC STRUCTURE OF

LOWER ALIMENTARY TRACT

SRI

WIRYAWA

N

LARGE INTESTINESMALL INTESTINE

What is the region of small intestine ?

What is the region of large intestine ?

Medical Faculty of Udayana University.

GENERAL STRUCTURE OF ALIMENTARY TRACT

• Mucosa– Epithelium– Lamina

Propia– Mucularis

mucosa

• Submucosa• Muscularis

externa• Adventitia/

SerosaWhat is the difference of adventitia & serosa ?

Medical Faculty of Udayana University.

THE HISTOLOGIC STRUCTURE OF SMALL INTESTINE

Medical Faculty of Udayana University.

THE HISTOLOGIC STRUCTURE OF SMALL INTESTINE

Medical Faculty of Udayana University.

THE HISTOLOGIC STRUCTURE OF SMALL INTESTINE

Medical Faculty of Udayana University.

`

What are the functions of Brunner’s glands ?

Medical Faculty of Udayana University.

SMALL INTESTINE : JEJUNUM

Medical Faculty of Udayana University.

SMALL INTESTINE : ILEUM

Structural Modifications of The Small Structural Modifications of The Small Intestine wall increase surface area :Intestine wall increase surface area :

Plicae circulares: deep circular folds of the Plicae circulares: deep circular folds of the mucosa and submucosamucosa and submucosa

Villi – fingerlike extensions of the mucosaVilli – fingerlike extensions of the mucosa

Microvilli – tiny projections of absorptive Microvilli – tiny projections of absorptive mucosal cells’ plasma membranesmucosal cells’ plasma membranes

Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings

Small Intestine: Microscopic Anatomy

Figure 23.21

GLYCOCALYX

What are the functions of glycocalyx ?

Medical Faculty of Udayana University.

HISTOLOGY OF LARGE INTESTINE

GlandsLamina propria

Tunica serosa (some adventitia)

}Tunica mucosa

LARGE INTESTINE

Muscularis mucosae

Tunica submucosa

Tunica muscularis externa

with Tenia coli - 3 bands of

longitudinal muscle - absent from the rectum & v. appendix

No villi

Medical Faculty of Udayana University.

Medical Faculty of Udayana University.

THE LARGE INTESTINE

Lamina propria

Tunica serosa

VERMIFORM APPENDIX

Muscularis mucosae

Tunica submucosa

T muscularis externa - thin

Lymphoid nodules in lamina propria and submucosa, often erasing the muscularis mucosae

Mucosa : No villi

THANK YOU