Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 12, 522-525, Copyright © 1975 by Society for the Study of Reproduction

Fetectomy in Monkeys (Macaca mulatta): Retention of the Placenta past Normal Term

JONATHAN T. LANMAN 1, SUMI M. MITSUDO 1, ASHLEY O. BRINSON 1, , and ROSEMARIE B. THAU 1

1 The Population Council, Biomedical Division, The Rockefeller University, New York, N. Y. 10021 and Department of Pathology, Montefiore Hospital and Medical Center, Bronx. N.Y. 10467 (S. M. M.)


Fetectomy was performed in 13 monkeys, leaving the placentas in place. Nine of the 13 placentas were delivered at a time past normal term. All or part of the placentas were recovered after spontaneous expulsion from 11 animals and by surgical recovery from 1. The frequency and ease of recovery after spontaneous expulsion indicated that in the absence of a live infant, the maternal instinct to eat the placenta was lacking. Placental weights after recovery were near or somewhat greater than those expected at the time of fectectomy, but below that of normal term placentas, indicating that after removal of the fetus, little or no net growth of the placenta occurred. Histological examination of the 12 placentas revealed viable trophoblast in 10 specimens, with variable areas of non-neoplastic cytotrophoblastic hypertrophy and hyperplasia in 8 of the 10 specimens.

Accepted on January 8, 1975






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Copyright © 1975 by the Society for the Study of Reproduction.