PMID: 1200396Jun 9, 1975Paper

Ultrastructure of cleavage stages and preimplantation embryos of the baboon

Anatomy and Embryology
M PanigelR L Heberling

Abstract

The baboon preimplantation stages were examined using light and electron microscopy. Six cases were studied at 2, 3, 4, 5, 7 and 8 days estimated fertilization age. The first 3 specimens were composed of 2, 8 and 24 blastomeres respectively. At 5 days, 30 to 40 cells were counted and more than 60 cells in later stages. Primitive "trophoblast cells" differentiate at 7 days and a crescentic blastocoele appears at 8 days. Shedding of the zona pellucida is not observed in the 7 and 8 day specimens. The preimplantation period is longer in the baboon than in man. C-type viruses are observed in the zona pellucida, in the perivitelline and interblastomeric spaces. Microvilli and caveolae cover ther periphery of the baboon conceptus. As in many other mammals, transformation of the mitochondria, changes in the ribosomes distribution, multivesicular bodies, myelin figures, nucleoli and intranuclear clusters of granules are described in the baboon. Cytoplasmic fibrous strands are not present as in the mouse. Experiments on the influence of hormones and drugs on ultrastructural changes would help to evaluate the importance of biohazards during the early development of primates.

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Citations

Dec 5, 2003·Reproductive Biomedicine Online·Hossein Baharvand, Klaus Ingo Matthaei
Aug 1, 1981·Biological Reviews of the Cambridge Philosophical Society·M H Johnson
Sep 30, 1976·Anatomy and Embryology·J E FléchonE S Hafez
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Dec 1, 1985·The American Journal of Anatomy·J A CarnegieH A Robertson
Sep 1, 1981·The American Journal of Anatomy·A C Enders, S Schlafke
Jul 1, 1983·The American Journal of Anatomy·A C EndersS Schlafke
Sep 25, 2010·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Vanessa J HallPoul Hyttel
Nov 1, 1994·Journal of Assisted Reproduction and Genetics·L Plante, W A King
Aug 3, 2007·Bioinspiration & Biomimetics·V V Pavlov
Jan 1, 1981·Upsala Journal of Medical Sciences·P K MehrotraB O Nilsson
Sep 10, 2005·Mitochondrion·Heide SchattenQing-Yuan Sun

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