File:Human pronuclear stage EM14-16.jpg

Human Pronuclear Stage - Pronuclear Envelope

• The space between the two sheets of the pronuclear envelope is zonally enlarged due to blebbing of the outer sheet toward the cytoplasm (c).
• Spheroidal or elongated vesicles are contained in these dilated regions.
• The vesicles are bound by membranes which arc always distinct from the pro- nuclear envelope.
• The vesicles are similar to the small ER vesicles present in the cytoplasm.
• They may represent cndoplasmic reticulum components which have become associated with the pronuclei (PN).

Fig. 14, X 28,500. Figs. 15 and 16, X 104,000.

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

Reference

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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