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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.)