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Related Experiment Videos

Developing dentate nucleus in man: a qualitative and quantitative study.

A Hayaran1, S Wadhwa, G Gopinath

  • 1Department of Anatomy, All India Institute of Medical Sciences, New Delhi.

Experimental Brain Research
|January 1, 1992
PubMed
Summary

This study reveals significant neuronal cell death in the developing human dentate nucleus (DN) between 19 and 23 weeks of gestation. This process is crucial for the maturation of the DN

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Human Anatomy

Background:

  • The dentate nucleus (DN) is a critical component of the cerebellum involved in motor control and learning.
  • Understanding the developmental trajectory of the human DN is essential for identifying potential neurological disorders.
  • Previous research has limited data on the precise timing of cellular changes within the developing human DN.

Purpose of the Study:

  • To investigate the histological and quantitative changes in the human dentate nucleus during fetal development.
  • To determine the timeline of DN structural maturation and neuronal population dynamics.
  • To identify the occurrence and significance of neuronal cell death in the developing human DN.

Main Methods:

  • Histological examination of Nissl-stained sections from 14 human fetuses (10-28 weeks gestational age).

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  • Quantitative analysis of neuronal density and absolute neuronal counts.
  • Assessment of glial cell population changes throughout gestation.

    • Main Results:

    • The dentate nucleus was delineated by 11 weeks, with adult morphology achieved by 27-28 weeks.
    • Distinct magnocellular and parvocellular regions emerged at 17-18 weeks.
    • A significant decline in neuronal count occurred between 19-20 and 22-23 weeks, coinciding with marked neuronal cell death.
    • Glial cell numbers steadily increased with advancing gestational age.

    Conclusions:

    • Significant neuronal cell death occurs in the human dentate nucleus between 19 and 23 weeks of gestation.
    • This period of cell death is a critical event in the maturation of the dentate nucleus.
    • The findings provide novel insights into the developmental processes of the human cerebellum.