Posted by CB on September 04, 2011 at 18:21:33:
In Reply to: Urinary development T/F posted by TA ANNA on September 02, 2011 at 14:13:06:
: Development of the Urinary System: T/F
: 1.An important source of primordial tissue for development of the urogenital system is the nephrogenic cord, derived from lateral mesoderm.False- it is derived from intermediate mesoderm.
: 2.The metanephroi, the intermediate set of kidneys, develop in the cervical region and function for a short time in fetal life. False- this would be the mesonephroi.
: 3.Ascent of the kidneys is attributed primarily to the upward movement of the organs. False- it is actually due to caudal growth. This is why the kidneys actually need three sources of blood
: 4.A horseshoe kidney typically cannot ascend to the adult position because it gets caught up on the superior mesenteric artery at L3. False. L3 is the position of the Inferior mesenteric artery.
: 5.The metanephric blastema gives rise to the collecting duct system, whereas the ureteric bud gives rise to structures that compose a nephron. False. The opposite is true. The ureteric bud gives rise to the collecting duct, renal calices, adn ureter. The 'hat' or blastema gives rise to the functional unit of the kidney, the nephron.
: 6.The cloaca is partitioned by the urorectal septum into the ventrally located rectum, and dorsally located UG sinus. False. The UG sinus is ventral (hopefully) and is divided in to the vesicular (hence the supravesicular fossa), pelvic,and phallic portions.
: 7.The trigone of the bladder represents an area where the primitive ureters were incorporated into the anterior inferior bladder wall. False. This would be the posterior bladder wall (dorsal side).
: 8.The epithelium of the lower urinary tract is primarily derived from ectoderm. False. It is mostly derived from endoderm. Ectoderm does line the most distal aspect of the male urethra.
: 9.The urachus underlies the medial umbilical folds. False. Median umbilical folds.
: 10.A urachal sinus is a malformation in which urine could travel from the bladder and exit the body by way of the umbilicus. True? If the superior part of the urachus also remains patent (a sinus is a dialation of the urachus).
Thanks Anna!