File:Human pronuclear stage EM13.jpg

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Human Pronuclear Stage - Crystalline Inclusions

  • Crystalline inclusions such as those shown in these mierographs are present in limited numbers throughout the cytoplasm of the penetrated ovum.
  • They are thought to represent ooplasmic yolk.
  • When observed in cross-section (Fig. 12), the inclusions appear to be composed of 10 to 25 parallel, faintly striated rods.
  • In an oblique or tangential plane (Fig. 18), the rods form hexagonal crystalline arrays.
  • Note the pointed profile of one of these inclusions in the lower left corner of the micrograph.

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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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