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Related Experiment Videos

The principles of normal and abnormal hindgut development

D Kluth1, M Hillen, W Lambrecht

  • 1Department of Pediatric Surgery, University Hospital Hamburg, Germany.

Journal of Pediatric Surgery
|August 1, 1995
PubMed
Summary

Anorectal malformations may stem from a shortened cloacal membrane, leading to a missing anal opening region. This study observed abnormal cloacal development in SD mice, supporting theories of ectopic anal positioning.

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Area of Science:

  • Developmental Biology
  • Embryology
  • Medical Science

Background:

  • Anorectal malformations (ARMs) are complex congenital anomalies.
  • Previous theories often attributed ARMs to impaired cloacal septation.
  • vd Putte (1986) challenged fusion-based theories for ARMs.

Purpose of the Study:

  • To investigate the principles of normal and abnormal cloacal development.
  • To elucidate the morphological basis of anorectal malformations.
  • To evaluate existing theories on ARM etiology.

Main Methods:

  • Morphological study of cloacal development in rat and SD mouse embryos.
  • Utilized scanning electron microscopy (SEM).
  • Observed 245 normal rat embryos and 80 abnormal SD-mouse embryos.

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Main Results:

  • Identified the future anal opening region as a fixed point in normal rat embryos.
  • Observed a shortened cloacal membrane and missing anal opening region in abnormal SD mouse embryos.
  • Documented a spectrum of cloacal malformations in SD mice, correlating with human ARMs.

Conclusions:

  • Findings support the hypothesis that a shortened cloacal membrane is implicated in ARM development.
  • The "fistula" in ARMs may represent a normal anus in an ectopic position.
  • Abnormal cloacal morphology in SD mice provides a model for studying human anorectal malformations.