Flashcards in Lecture 29: Urinary Tract and Adrenals Deck (26):
4th embryonic week, cervical nephrotomes which come off of pronephric duct. Is both transitory and nonfunctional
Late in the fourth wekk, functional temporarily, consists of two nephrotomes which turn into glomerulie, mesonephric tubules which come off of the mesonephric duct.
Degenerate at end of first trimester
Three stages of embryological kidneys
ronephros, mesonephros, metanephros
Each mesonephric tubule ends in?
A bowmans capsule
Parts of adult kidney
cortex, medulla, collecting system --> ureter
definitive kidnesy, development begins in fifth week, functional begins in 9th week. After 12th wekk, majority of amniotic fluid is fetal urine
fetal urine vs. adult urine
much more watery as mother removes more metabolic waste from the urine. Fetus drinks urine, re-filters it, pees it out.
also called ureteric bud, it is an outgrowth of the distal mesonephric duct--> gives rise to ureters renal pelvis, calices, and collecting tubules.
metanephric mass of intermediate mesoderm gives rise to?
also called metanephrogenic blasteme. Gives rise to nephrons (filtration system of the kidneys)
how do the metanephric diverticulum and the metanephric mass of intermediate tissue effect each other?
the ureteric bud grows into the the intermediate tissue and induces the metanephrogenic blastoma.
the metanephrogenic blastema induces the ureteric bud to undergo successive branching
Branching of ureteric bud
Major Calices (1-4) --> Minor Calices (4-8) --> collecting tubules (>8)
What makes up a corposcule
The bowmans capsule and the glomerulus
Parts of nephron
Corposcule, proximal convoluted tubule, loop of henle, distal convoluted tubule
metanephric vesicles, what induces them and what do they turn into?
Initial metanephric blastema growth, induced by outgrowth of ureteric bud (primordial collecting tubule). Elongate into metanephric tubules, which attach to ureteric bud, become continuous with it.
What creates the bowman's capsule?
Is the metanephric tubule (now attached to the ureteric bud) that becomes invaginated by the glomerulus capillaries
What develops into the urorectal septum
What does the urorectal septum separate?
The rectum, and the urogenital sinus
parts of the urogenital sinus
vesicle part --> bladder
pelvic part --> urethra
phallic part --> grows towards genital tubercle
epithelium of bladder
outer layer of bladder
relationship of early bladder and alantois
They are continuous with each other
what does the urethra develop from?
trigone of the bladder
forms a triangle, top two points are where the ureters enter, bottom point where urethra exits
position of bladder in children vs. adults
children is abdominal, adult is pelvic
not enough amniotic fluid for the fetus, the body doesn't have enough space to grow so the bones and muscles are all squished up