Embryology Flashcards
endoderm gives rise to
epithelial of mucosa
associated ducts and glands
visceral mesoderm gives rise to
lamina propria
muscularis mucosa and muscularis externa
CT of submucosa and external CT
neural crest gives rise to
enteric nervous system
meissner’s plexus present by week 8
auerbachs plexus present by week 12
what are the two ventral mesenteries
lesser omentum
falciform ligament
what are the 4 dorsal mesenteries
dorsal mesogastrium
dorsal mesoduodenum
mesentery proper
dorsal mesocolon
when does the longitudinal and circular muscle form in the oesophagus development
longitudinal - week 8
circular - week 5
caudal portion of foregut
parts 1 and 2 of duodenum
cranial portion of midgut
parts 3 and 4 of duodenum
where does the liver grow into
mesoderm of the septum transversum
endoderm assoc with liver makes up..
liver cells
lining of biliary tree
septum transversum gives rise to
haematopioetic cells
kupffer cells
connective tissue
describe the spleen
mesoderm derivative
develops in 5th week
initially haematopeotic (production of RBC)
develops into lymphatic organ during weeks 15-18
what is included in the midgut
second half of duodenum (parts 3 and 4) jejunum ileum caecum and appendix ascending colon proximal 2/3 of transverse colon
what happens to the midgut at the beginning/middle/end of week 4
beginning - communicates with yolk sac along its length
middle - connection with yolk sac narrows
end - connected to yolk sac via narrow vitelline duct
hindgut
transverse colon and the splenic flexure, the descending colon, sigmoid colon and rectum
foregut
the oesophagus, the stomach, and portion 1 and 2 of the duodenum. In addition, the pancreas, liver, and gallbladder form embryologically from the foregut
