The pronephros disappears very early; the structural elements of the mesonephros mostly degenerate, but the gonad is developed in their place, with which the Wolffian duct remains as the duct in males, and the M�llerian as that of the female.
32.
At 10 days post coitus ( d . p . c . ) the aorta gonad mesonephros region was able to initiate and expand definitive haematopoietic stem cell activity, whereas no haematopoietic activity was seen in the yolk sac until 11 d . p . c.
33.
Definitive hematopoiesis then occurs later in the aorta-gonad-mesonephros ( AGM ), a region of embryonic mesoderm that develops into the ventral wall of the dorsal aorta, at E10.5 in mice and 4wpc ( 4 weeks post-conception ) in humans.
34.
At first the mesonephros and genital ridge are suspended by a common mesentery, but as the embryo grows the genital ridge gradually becomes pinched off from the mesonephros, with which it is at first continuous, though it still remains connected to the remnant of this body by a fold of peritoneum.
35.
At first the mesonephros and genital ridge are suspended by a common mesentery, but as the embryo grows the genital ridge gradually becomes pinched off from the mesonephros, with which it is at first continuous, though it still remains connected to the remnant of this body by a fold of peritoneum.
36.
And I've always been told that all " higher " chordates ( so everything other than urochordates and cephalochordates ) develop a mesonephros, however i've also been told that only amphibians and fish have a mesonephros as the adult kidney, so which is it ? talk ) 23 : 23, 3 January 2008 ( UTC)
37.
And I've always been told that all " higher " chordates ( so everything other than urochordates and cephalochordates ) develop a mesonephros, however i've also been told that only amphibians and fish have a mesonephros as the adult kidney, so which is it ? talk ) 23 : 23, 3 January 2008 ( UTC)
38.
The mesonephros persists and form the permanent kidneys in fishes and amphibians, but in reptiles, birds, and mammals, it atrophies and for the most part disappears rapidly as the permanent kidney ( metanephros ) develops beginning during the sixth or seventh week, so that by the beginning of the fifth month only the ducts and a few of the tubules of the mesonephros remain.
39.
The mesonephros persists and form the permanent kidneys in fishes and amphibians, but in reptiles, birds, and mammals, it atrophies and for the most part disappears rapidly as the permanent kidney ( metanephros ) develops beginning during the sixth or seventh week, so that by the beginning of the fifth month only the ducts and a few of the tubules of the mesonephros remain.
40.
Kerr coined the term " opisthonephros " in 1919 . In 1949, Hyman wrote the opisthonephros has used up the mesomere tissue from which in amniotes both mesonephros and metanephros come . Some accounts call opisthonephros the mesonephros, but the opisthonephros in anamniotes ( lampreys, fish, and amphibians ) differ considerably than the mesonephros in amniotes ( reptiles, birds, and mammals ).
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