Evolving Vicissitudes in Mesonephric Kidney of Sheep (Ovis aries)
2021
Durga Prasad, D.V.V.N.
The mesonephros was established on the portion of pronephric duct, immediately behind the pronephric tubules. In 20 days (0.7cm CRL) of gestation the mesonephros consisted of primitive tubules and developing glomerulus. At 25 days (1.5cm CRL) of gestation, the blood supply from the aorta was established predominantly to their mesonephric glomeruli. The number of glomerulus and tubules was drastically increased in 27 days sheep embryo (1.7 cm CRL). Between 29 to 31 days of gestation, (2 cm CRL) mesonephros related to the 7-8th somite cranially and extended upto the 16th somite caudally. In 37 days (3 cm CRL) the parenchyma was densely packed with many glomeruli and tubules. At 40 days (3.5cm CRL) the degenerative process was initiated in the anterior pole. At 49 days (7cm CRL) of gestation, at the anterior pole the degenerative process was progressively increased. At 57 days (10cm CRL), the mesonephros was closely adherent to the testes and parenchyma was replaced with connective tissue. The mesonephros was covered by thick capsule which was lined by squamous cells at 74 days and transformed to ductus deferens of the testes at this age.
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