The Endometrium of Delayed and Early Implantation

  • Allen C. Enders
  • Randall L. Given


The length of gestation in a given species is generally proportional to the size of the young at birth and the relative maturity of the neonates. However, there are several variations in reproductive patterns that can extend the length of time from copulation to parturition. Delayed fertilization is a rare phenomenon found in a few species of bats (Wimsattet al 1966). Characteristically, sperm from a fall mating remain viable at the tubouterine junction until ovulation in the spring (Racey and Potts, 1970), and there is no retardation in the development of the zygote once fertilization has occurred. Conversely, in retarded development, now reported in at least two genera of bats, implantation occurs shortly after the blastocyst appears in the uterus, but formation of the placenta is slow, expecially the establishment of appropriate vascularization, and the early developmental stages of the embryo are retarded (Fleming, 1971; Bleier, 1975; Burns and Wallace, 1975; Wimsatt, 1975).


Gland Cell Delay Period Glandular Epithelium Common Shrew Luminal Epithelium 
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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • Allen C. Enders
    • 1
  • Randall L. Given
    • 1
  1. 1.Department of Anatomy and NeurobiologyWashington University School of MedicineSt. LouisUSA

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