T-17 Urogenital development Flashcards
What filters blood in the kidneys
the glomeruli
Order of urine collection
Minor calyx-> major calyx-> renal pelvis
Where is the bladder found
posterior to the pubic symphysis
What connects the anterior surface of the bladder to the umbillicus
the median umbillical ligament
Where does the urethra begin
at the base of the bladder
What does the urethra end with
a perenial external opening
Urethra in female features
-short -wide lumen -external urethral orfice opens anterior to the vaginal opening within the borders of the labia minora
Urethra in male features
-long -narrow lumen -external urethral orfice opens at the distal end of the glans penis
What occurs at the beginning of kidney development
intermediate mesoderm is carried ventrally and loses connection with somites
How is the urogenital ridge formed
it is formed as longitudinal elevation of mesenchyme develops on either side of the dorsal aorta
What does the urogenital ridge consist of
a nephrogenic cord+ a gonadal ridge
Which part of the urogenital ridge gives rise to the urinary system
the nephrogenic cord
Which part of the urogenital ridge gives rise to the gonads
the gonadal ridge
What are the 3 sets of successive kidneys in the developing embryo
Pronephroi, mesonephroi, metanephroi
When does the pronephroi appear
early in the 4th week
Where does the pronephroi appear
in the neck reigon of the early embryo
What happens to the cranial part of the pronephric ducts
they degenerate
What happens to the caudal part of the pronephric ducts
they persist and transition into the mesonephric ducts
When do the mesonephroi appear
Late in the 4th week
Where do the mesonephroi appear
caudal to the pronephroi
What do mesonephroi contain
about 40 glomeruli with mesonephric tubules
What do the mesonephric tubules open into
the mesonephric ducts
What do the mesonephroi produce from about week 6-10
filtrate, not urine
What does the mesonephric duct open into
the cloaca
What are the primordia of the permanent kidneys
The metanephroi
When do the metanephroi begin to develop
early in the 5th week
When do the metanephroi become functional
in the 9th week
What connects the uteric bud to the mesonephric duct
the stalk of the uteric bud
What surrounds the uteric bud in the 5th week
the metanephrogenic blastema
Which week is this
week 5
Which weeks are these
weeks 6 and 7
What does the uteric bud become
ureter and collecting structures
