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Observations on the fetus and placenta of a proboscis monkey (Nasalis Iarvatus)

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Abstract

The villous bidiscoid placenta in utero of a proboscis monkey with a fetus of 9.0 cm crown rump length was examined. The immature male fetus weighed 56 g and had a 5.4 cm head circumference. Of particular interest was the stomach, consisting of three parts, large fundus, a narrow tubular portion, and a small pyloric region. The fetal adrenal glands were remarkable in that they were larger than the kidneys. Thus, the adrenal/kidney weight ratio approximated 1.18.

The marginally inserted umbilical cord measured 15 cm. Owing to the superficial implantation in the proboscis monkey, penetration of syncytiotrophoblast and a fibrin layer were not observed in the basal plate of the placenta; cytotrophoblastic cell columns attached to the basal plate, consisting of decidua basalis without invasion of trophoblastic giant cells. Intraarterial trophoblastic migration was found in the uterus.

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Authors and Affiliations

  1. Department of Obstetrics and Gynecology, Tokyo Medical College Hospital, Nishishinjuku 6, Shinjuku-ku, 160, Tokyo, Japan

    Hiroaki Soma

  2. The San Diego Zoo, 92112, San Diego, California, USA

    Kurt Benirschke

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  1. Hiroaki Soma
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  2. Kurt Benirschke
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Soma, H., Benirschke, K. Observations on the fetus and placenta of a proboscis monkey (Nasalis Iarvatus). Primates 18, 277–284 (1977). https://doi.org/10.1007/BF02383106

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  • DOI: https://doi.org/10.1007/BF02383106

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