comparison of mucosae of stomach,small and large intestines
TRANSCRIPT
gastricpit
gastricgastric
glandgland
stomach large intestinesmall intestine
lamina muscularis mucosae
inte
stin
alvi
lli
inte
stin
alg
lan
ds
inte
stin
alg
lan
d
lamina propria
stomach large intestinesmall intestine
goblet cell
enteroendo-crine cell
enterocyte
anatomical (macroscopic) features
> taeniae coli
> longitudinal layer of muscularis is split into 3 bands
> absent from the appendix and rectum
> haustra coli (colic sacculations)
> outpocketings between two semilunar folds
> appendices epiploicae / appendices omentales
> serosa-covered appendages containing adipose tissue
general histological (microscopic) features
> (1) concomitant special properties:
> has intestinal glands (crypts of Lieberkühn)
> lacks intestinal villi
> (2) ratio of goblet cells to enterocytes is much larger in the largeintestine than in the small intestine
histological (microscopic) feature of appendix
> aggregated lymphatic follicles (folliculi lymphatici aggregati)
> are found as a complete ring in the wall of the appendix
(tela subserosa and/or lamina propria mucosae)
ileumappendix
vermiformis
mesentery meso-appendix
the last segment of the rectum
> proximal boundary
> beginning of anal / rectal column of Morgagni
(anorectal line)
(> pelvic diaphragm; levator ani muscle)
> distal boundary
> anus
> portions of anal canal (different covering epithelia)
> zona columnaris
> zonazona intermediaintermedia / / zonazona haemorrhoidalishaemorrhoidalis
> zona cutanea
external anal sphincter (striated m.)
middle rectal v.
venous plexus in the submucosa
adipose tissue
anal column
anal sinus
columnariscolumnaris--haemorrhoidalishaemorrhoidalis boundaryboundary
perineal skin
anus, skin
levator ani m. (striated m.)
internal anal sphincter (smooth m.)
longitudinal layer (smooth m.)
circular layer (smooth m.)
inferior rectal v.
haemorrhoidalishaemorrhoidalis--cutaneacutanea boundaryboundary
epitheliumepithelium ofof thethe analanal columncolumnepitheliumepithelium ofof thethe analanal sinussinus
circumanal gl. (apocrine sweat gl.)
sebacous gl. (holocrine gl.)