Duodenum, jejunum, ileum Flashcards
Duodenum (first part SI) mucosa layer
simple columnar epithelium (invaginates to lamina propria, circular folds and intestinal villi
lamina propria- evaginations of intestinal villi which are covered in absorptive cells called enterocytes
Goblet cells and enteroendocrine cells, blood vessels and lymphatic ducts
Muscularis mucosae- inner circular outer longitudinal
What are the simple tubular glands in the lamina propria of duo
Lieberkuhn crypts which delivers secretions into intervillous spaces
Made of columnar striated resorptive or non striated, goblet mucous cells, enteroendocrine and Paneth cells
Crypts reach into muscularis mucosae
Submucosa of Duo
Branched tubular, BRUNNER GLANDS
Cuboidal cells with oval flattened nuclei
Secretes alkaline fluid to neutralise the acidity from stomach and prevent damage to mucosa
They deliver secretions through crypts of Lieberkuhn
Tunica muscularis of duo
Inner circular outer longitudinal smooth muscle
Auerbach myenteric plexus
Outer layer of duo
partly covered by serosa (anteriorly)
Rest covered by adventitia
Tunica mucosa of small intestine
epithelium-evaginations of intestinal villi (more goblet cells), simple resorbtive columnar
lamina propria- Lieberkuhn crypts open into intervillous spaces
Numerous nuclei-evidence of lymphatic filtration
poorly developed muscularis mucosae
submucosa small intestine
large blood vessels in the connective tissue
No brunners glands
Muscularis and outer layer small intestine
inner circular and outer longitudinal
serosa on outside with visceral peritoneum
