page_title: Mesonephros
section_title: Mesonephric tubules
hierarchical_section_title: Mesonephros / Structure / Development / Mesonephric tubules
caption_attribution_description: Enlarged view from the front of the left Wolffian body before the establishment of the distinction of sex. (From Farre, after Kobelt.) a, 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.
context_page_description: The mesonephros is one of three excretory organs that develop in vertebrates. It serves as the main excretory organ of aquatic vertebrates and as a temporary kidney in reptiles, birds, and mammals. The mesonephros is included in the Wolffian body after Caspar Friedrich Wolff who described it in 1759.
context_section_description: This vesicle then elongates to form the mesonephric tubule, attaching to the mesonephric duct on one side. Meanwhile, an artery from the dorsal aorta begins extending towards the mesonephric tubule. When these two structures contact each other, they form the glomerulus and the Bowman's capsule surrounding it. The mesonephric tubule is also known as the Wolffian tubules (or Kobelt's tubules).
  On the medial side of the mesonephric 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 mesonephric duct, the other dilates and is invaginated by a tuft of capillary bloodvessels to form a glomerulus.
caption: 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. mesonephric 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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