day 2 histo-lower alimentary
DESCRIPTION
Histology of Lower AlimentaryTRANSCRIPT
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 ?
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
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
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