L 26 Reproduction II

L 26 Reproduction II - REPRODUCTION II DIFFERENT...

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REPRODUCTION II
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DIFFERENT REPRODUCTIVE PASSAGES - MALE Most primitive – hagfish and lampreys – NONE. Eggs and sperm discharged into coelom, exit through a genital pore at caudal end of archinephric duct. Amphibians Testis gives testis canal to efferent ductules to anterior end of opisthonephros to anterior kidney tubules to archinephric duct. In most archinephric duct carries both sperm and urine, but in others accessory urinary ducts present.
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Often see vestiges of Mullerian duct (oviduct).
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Chondrichthyan fish Internal ferilisation so modifications. Middle bit modified to Leydig’s gland secreting seminal fluid. Archinephric duct widens to seminal vesicle, contributes to seminal fluid and stores sperm. Pelvic fins modified to a copulatory clasper for transfer of sperm. Vestiges of oviducts.
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Teleosts have evolved a sperm duct to by-pass the kidneys. Lungfish – testis connects with caudal rather than cranial part of opisthnephros.
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completely separate. All very similar to mammals except for location of testis in scrotum. Prostate gland, vesicular gland & bulbourethral gland nourish and protect sperm by adding to seminal fluid. Formerly the archinephric duct
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L 26 Reproduction II - REPRODUCTION II DIFFERENT...

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