Wolffian tubules
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| Wolffian tubules | ||
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| Section of the urogenital fold of a chick embryo of the fourth day. | ||
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| 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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| Gray's | subject #252 1205 | |
| Dorlands/Elsevier | t_22/12829787 | |
On the medial side of the Wolffian duct, from the sixth cervical to the third lumbar segments, a series of tubules, the Wolffian tubules (or Kobelt's tubules), is developed; at a later stage in development they increase in number by outgrowths from the original tubules.
These tubules first appear as solid masses of cells, which later 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 blood vessels to form a glomerulus.
The tubules collectively constitute the mesonephros or Wolffian body.
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| Mammalian development of embryo and development of fetus (some dates are approximate - see Carnegie stages) |
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| Week 1: Zygote - Morula - Blastula/Blastomere/Blastosphere - Archenteron/Primitive streak - Blastopore - Allantois - Trophoblast (Cytotrophoblast - Syncytiotrophoblast - Gestational sac)
Week 2: Yolk sac - Vitelline duct - Bilaminar disc Week 3: Hensen's node - Gastrula/Gastrulation - Trilaminar embryo Branchial arch (1st) - Branchial pouch - Meckel's cartilage - Somite/Somitomere - Sclerotome - Myotome - Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial mesoderm, Intermediate mesoderm, Lateral plate mesoderm, Splanchnopleure, Somatopleure) Histogenesis and Organogenesis Uterine support: Placenta - Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) - Amniotic sac (Amnion, Chorion) |
