File:Human pronuclear stage EM29.jpg

From Embryology

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Human Pronuclear Stage - Second Polar Body

  • The second polar body (PB2) has a spheroidal nucleus consisting of dense chromatin aggregates and a highly hydrated nucleoplasm.
  • A double nuclear membrane is present. The lamellar structures (*) embedded in the chromatin clumps may represent either nuclear annulate lamellae or the chromosomal axial complex.
  • The lamella toward the left of the micrograph is shown at higher magnification in the insert. Note the regressive changes of the mitochondria.

Fig. 29, X 15,000. Inset, X 114,000.

Pronuclear Stage EM: | Human pronuclei | Human pronuclei | Mitochondria | Mitochondria | Endoplasmic Reticulum | Endoplasmic Reticulum | Endoplasmic Reticulum | Cytoplasmic LameIlae | Cytoplasmic LameIlae | Crystalline inclusions | Crystalline inclusion | Pronuclear Envelope | Pronuclei Annulate Lamellae | Pronucleus | Nucleoli | Spermatozoon | Human pronuclei | Spermatozoon Components | Golgi complex | First Polar Body | First Polar Body | First Polar Body | Second Polar Body | Second Polar Body | pronuclei | polar body | fertilization | Carnegie stage 1


Zamboni L, Mishell DR, Bell JH & Baca M. (1966). Fine structure of the human ovum in the pronuclear stage. J. Cell Biol. , 30, 579-600. PMID: 6008199


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