The ureteric bud, arising from a bend in the mesonephric duct, pushes into the metanephric blastema, inducing the development of the permanent kidney in the:
(a) 5th gestational week
(b) 8th gestational week
(c) 10th gestational week
(d) 12th gestational week
Answer: (a) Early development of the permanent kidney occurs during the 5th gestational week when the ureteric bud meets up with the metanephric mass. By the 6th week the kidney has ascended above
the umbilical arteries and by the 8th week the center of the kidney has reached its permanent
level just below the adrenal gland (making (b) incorrect). The fetal kidney will start to secrete
urine by the 10th gestational week (making (c) incorrect). From the 6th to 20th gestational
weeks, the major calices subdivide into the 12 generations of caliceal formation (making (d) incorrect).
(a) 5th gestational week
(b) 8th gestational week
(c) 10th gestational week
(d) 12th gestational week
Answer: (a) Early development of the permanent kidney occurs during the 5th gestational week when the ureteric bud meets up with the metanephric mass. By the 6th week the kidney has ascended above
the umbilical arteries and by the 8th week the center of the kidney has reached its permanent
level just below the adrenal gland (making (b) incorrect). The fetal kidney will start to secrete
urine by the 10th gestational week (making (c) incorrect). From the 6th to 20th gestational
weeks, the major calices subdivide into the 12 generations of caliceal formation (making (d) incorrect).
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