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Sperm penetration through the zona pellucida of the sheep egg

✍ Scribed by Dziuk, P. J. ;Dickmann, Z.

Publisher: John Wiley and Sons
Year: 1965
Tongue: English
Weight: 290 KB
Volume: 158
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1401580210

No coin nor oath required. For personal study only.

✦ Synopsis

Sheep eggs were obtained at appointed times from 4 to 16 hours after ovulation and examined for evidence of penetration by spermatozoa. The following observations were made: ( 1 ) The fertilizing spermatozoon makes a curved slit in the zona as a result of traversing it. The slit seems to be an open passage. ( 2 ) The sperm head of the ram has ventral-dorsal asymmetry. The flat side of the sperm head always faces the vitellus as it passes through the zona. ( 3 ) A fine filament-like structure was observed extending from the anterior tip of sperm heads embedded in the zona. ( 4 ) The site on the zona at which spermatozoa penetrate mto the egg is random.

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