Wolffian tubules

Wolffian tubules

Infobox Embryology
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Caption = Section of the fold in the mesonephros of a chick embryo of the fourth day. Wolffian tubules are labeled to the right.


Caption2 = Enlarged view from the front of the left Wolffian body before the establishment of the distinction of sex.

a, b, c, d. Tubular structure of the Wolffian body.
e. Wolffian duct.
f. Its upper extremity.
g. Its termination in x, the urogenital sinus.
h. The duct of Müller.
i. Its upper, funnel-shaped extremity.
k. Its lower end, terminating in the urogenital sinus.
l. The genital gland.
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DorlandsPre = t_22
DorlandsSuf = 12829787
The Wolffian tubules (or Kobelt's tubules) are precursors of the mesonephros.

Development

On the medial side of the Wolffian duct, from the sixth cervical to the third lumbar segments, a series of tubules, the Wolffian tubules, develops. They increase in number by outgrowths from the original tubules. The change from solid masses of cells to instead become hollowed in the center. One end grows toward and finally opens into the Wolffian duct, the other dilates and is invaginated by a tuft of capillary bloodvessels to form a glomerulus.

The tubules collectively constitute the mesonephros.

External links

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