A manual of obstetrics . ,.\ FiG. 22.—Fertilizalion of the ovum of a moUusk (Elysia viridis) : A, ovum sending up aprotuberance to meet the spermatozoon (5); £, approach of male pronucleus {M. PN.) tomeet the female pronucleus [F. PN.). Chang-es in the Ovum Prior to its Lodg-ement in theUterus. — An interesting series of phenomena occurwithin the ovum immediately subsequent to after penetration of the ovum the vibratile extremityof the spermatozoid is absorbed, leaving the head only,/which is known as the malepromiclais (Fig. 22). Thisunites with the female pr
A manual of obstetrics . ,.\ FiG. 22.—Fertilizalion of the ovum of a moUusk (Elysia viridis) : A, ovum sending up aprotuberance to meet the spermatozoon (5); £, approach of male pronucleus {M. PN.) tomeet the female pronucleus [F. PN.). Chang-es in the Ovum Prior to its Lodg-ement in theUterus. — An interesting series of phenomena occurwithin the ovum immediately subsequent to after penetration of the ovum the vibratile extremityof the spermatozoid is absorbed, leaving the head only,/which is known as the malepromiclais (Fig. 22). Thisunites with the female pronucleus to form the •~&&spCT^n -tfiMrrsWSpiiTT. THe female pro-nucleus is formed in the fol-lowing manner: Within a fewhours after impregnation theprotoplasmic yelk undergoes aprocess of shrinkage, so that atransparent space is seen toexist between it and the vitel-line membrane. Simultaneously with this process there occurs a disappearance of the germ-inal vesicle and spot, and two protrusions of granula
Size: 1558px × 1604px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
