Comparison of mucosae of stomach,small and large intestines

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Comparison of mucosae of stomach,small and large intestines

  1. 1. stomach small intestine large intestine intestinal villigastric intestinal glands intestinal glandpit lamina propriagastricgland lamina muscularis mucosae
  2. 2. stomach small intestine large intestine
  3. 3. enterocyte enteroendo- crine cellgoblet cell
  4. 4. 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
  5. 5. 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 large intestine than in the small intestinehistological (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)
  6. 6. appendixileum vermiformis mesentery meso-appendix
  7. 7. 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 > zona intermedia / zona haemorrhoidalis > zona cutanea
  8. 8. circular layer (smooth m.) middle rectal v. longitudinal layer (smooth m.) venous plexus in the submucosa levator ani m. (striated m.) adipose tissue anal column anal sinus columnaris-haemorrhoidalis boundaryinternal anal sphincter (smooth m.)external anal sphincter (striated m.) inferior rectal v. perineal skin haemorrhoidalis-cutanea boundary anus, skin
  9. 9. epithelium of the anal sinus epithelium of the anal column
  10. 10. sebacous gl. (holocrine gl.) circumanal gl. (apocrine sweat gl.)

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