embryo triage Flashcards
what forms the smooth muscle int he gut?
a coat of splanchnic mesoderm around the gut tube
What form the lining and glandular elemtns of the gut tube?
endoderm
what mesentary do the arteries supplying the gut travel through?
the dorsal mesentary
what part of the foregut develops the initial dilation tht forms the stomach?
caudal foregut
the left vagus nerve supplies the
ventral wall
the right vagus nerve supplies the
dorsal wall
which mesogastrium forms he greater omentum?
the dorsal mesogastrium
the lesser omentum is formed why which mesogastrium?
the ventral mesogastrium
what forms the dorsal and ventral pancreatic buds?
foregut ENDODERM
the ventral pancreatic bud will form the
pancreatic head, uncincate, and msot of pancreatic duct
the dorsal pancreatic bud will form the
pancrratic body neck and tail
the cranial limb of the midgut forms the
jejunum and ilium
the cuda limb of the midgut forms
lower ilium, ascending colon, transverse colon, cecum and vermiform appendix
how many degrees does the caudal limb rotate as it comes back in to the body?
180 degreees –> total 270
the cloaca develops from
ectoderm
the urogenital ridge develops from what
intermediate mesoderm
what do pronephric ducts develop from?
pronephroi of the intermediate mesoder,
mesonephri degenerate and their tubules become the
efferent ductules of the testes
the collecting portion of the permanent kidney comes from
the uteric bud
the exretory portion of the true kidney develops from the
caudal part of the nephorgenic cord
important: what is the uteric bud induced by?
metanephrogenic blastema
1-4 generation of the collecting tubulus of the metanephros form
major calices
what does the allointis form?
the urachus which disappears and forms the median umbilical ligament
the majority of the male urethra and the entirely of female urethra is derived from
endoderm
which part of the make urethra is not from endo derm and what is it from?
the urethra in the glans penis is from ectoderm
where does the smooth muscle of the urethra coem from?
splanchnic mesoderm
which part of the urogenital ridge produces the genitals?
the middle partt!
when is it possible to tell the different btw a girl and boy fetus?
12-14 weeks
what two homones ar enecessary for the formation of tetes?
DHT (dihydrotestosterone) and MIF (mullerian inhibiting fator)
SRy codes for what important protein
Testes determining factor (TDF) which induces teste differentiation
what does TDF do?
it causes primitive sex cords to proliferate to form testis cords / leads to testes differentiation
