Embryology Flashcards
which primitive layer do the urinary and reproductive systems develop from
the intermediate mesoderm
which ridge does the urinary tract develop from
nephrogenic
what ridge does the reproductive system develop from
gonadal ridge
What are the 3 stages of kidney development
pronephros
mesonephros
metanephros
when do pronephros form and when fo they degenerate
form in cervical region during week 4 and degenerate by the end of the week
where and when do mesonephros form
thoracic and upper lumbar regions- interim kidney until month 3
meonephric tubules develop and drain into wolffian duct of mesonephric duct which drains to cloaca
when do metanephros form
during week 5 and functional by end of 3rd month
what does the metanephric blastema form
intermediate mesoderm that forms excretory units- nephron like bowmands capsule, proximal convoluted tubules, loop of hence and distal convuluted tubules
what does the ureteric bud form
evagination of mesonephric duct, penetrates blastema and forms the duct system of collecting tubules, minor and major calyces and renal pelvis and ureter
Where do the kidneys form and when do they migrate
form in pelvis and ascend around week 9 to abdomen
do the kidneys lay in their original position when the ascend
they rotate about 90 medially
What does the urorectal septum divide
the cloaca into anterior urogenital sinus and posterior rectum/anal canal
What arises from the urogenital sinus
bladder and parts of urethra
what arises from the cranial portion of urogenital sinus
bladder and the urachus which forms median umbilical ligament
what forms the trigone region of urinary bladder
mesonephric duct
