Flashcards in L47: Urogenital Development Deck (58)
The Proliferation of the intermediate mesoderm (IM) generates the __________.
Nephorogenesis involves the successive appearance of 3 kidney primordia. What are they called? (Top to bottom when fetus is facing left)
The ______ derives from the mesonephric duct, while the kidney derives from the caudal end of the nephrogenic cord
The collecting system of the urinary system (kidney) derives from what?
When the kidney is being developed, what structure is part of the external region?
When kidney is being developed, what structures are part of the internal region?
Renal pelvis, major calyx, minor calyx, collecting tubes
The excretoru system derives from the ________?
Changes in the body shape makes the kidney take an ____ position
There is disappearance of arteries of kidney during formation except for the __________
Accessory renal artery
The cloaca (hindgut region) divides to form the primitive _______, from which the _____ and ___________ derive
Urogenital sinus; bladder & pelvic urethra
While the absorption of the mesonephric ducts makes the ureters join the bladder wall, the kidneys äscent" induces the develpment of the ___________
The genital system derives from the ________ and adjacent ducts
An embryo is bipotent and can develop to male or female. Mesonephros gives rise to 3 things- what are they?
- Mesonephic duct: gives rise to male genital ducts, requires androgens to develop, degenerates in females in response to low androgen levels
- Genital ridge: gives rise to the testes or ovaries (source of androgens and estrogens)
- Paramesonephric (Mullerian) duct: gives rise to female genital ducts, does not require hormones to develop, degenerates in males in response to Mullerian inhibiting substance (MIS)
Regardless of the genetic sex, the _____ have an initial indifferent stage
The primordial germ cells (PGCs) are close in proximity/ associated with what two things?
- Proliferating coelomic epithelium
- Primitive sex cords
Primordial germ cells give rise to either what or what?
Spermatogonia (male) or Oogonia (female)
Priminitive sex cords form what eventually?
Seminiferous cords, which gather together in loops
Tunica albuginea formed by thickening of coelmic epithelium that is losing connection with ___________
In male embryos the indifferent gonad differentiate into testes under the ____________ gene of the Y chromosome
influence of SRY
In the female embryo, the absence of the SRY gene results in dissociation of the primitve sex cords and differentiation of the gonad into _____
The medullary cords in the female embryo are going to _____
Degenerate and fill with vessels, tissues, etc
In ovary, in most mammal (cow, sow), the central location will disappear. In the mare, it will be the opposite the region from the primitive that would disappear will be the __________
Only one region of primitive cord survives- it will get divided and germ cells get enclosed by coelemic cells that give rise to ________
Primordial follicle derives from the _______
In primitive cords, males give rise to ______ cells, females _____ cells
The _______ derive from the mesonephric tubules, while the epididymis, ductus deferens, ampullas and vesicular glands derive from the ____________.
Efferent ducts; mesonephric duct
What is another name for the paramesonephric duct remnant?
The uterine tubes, uterus and cranial region of the vagina derive from the ____________ duct, while ___________________ & _____ derive from the urogenital sinus
Paramesonephric duct; caudal region of the vagina and vestibule
The dengenerating proxmial mesonephric tubules is called? What about the distal ""?