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Related Experiment Videos

Development of the human hypoglossal nucleus: a morphometric study.

T Nara1, N Goto, K Yamaguchi

  • 1Department of Pediatrics, Jikei University School of Medicine, Tokyo, Japan.

Developmental Neuroscience
|January 1, 1989
PubMed
Summary

Human hypoglossal nucleus development accelerates after 32 weeks gestation and shows postnatal maturation. Natural cell death may occur during fetal development, impacting neuron count.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Human Anatomy

Background:

  • The human hypoglossal nucleus is crucial for tongue movement.
  • Understanding its developmental trajectory is essential for diagnosing and treating related neurological disorders.

Purpose of the Study:

  • To investigate the developmental timeline and morphological changes of the human hypoglossal nucleus from fetal stages to adulthood.
  • To identify key periods of growth acceleration and cellular processes like apoptosis during development.

Main Methods:

  • Utilized complete serial sections of human brain specimens.
  • Analyzed brains from fetuses (16-40 weeks gestation), an infant, an adolescent, and an adult.
  • Performed morphometric analysis to quantify neuronal changes and development.

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Main Results:

  • Hypoglossal nucleus development appears to accelerate significantly after 32 weeks of gestation.
  • Postnatal maturation of the nucleus is evident through observable changes.
  • Evidence suggests natural cell death (apoptosis) occurs during fetal development, indicated by decreased neuron numbers and degenerating neurons.

Conclusions:

  • Human hypoglossal nucleus development is a prolonged process with a notable acceleration in late gestation.
  • Apoptosis plays a role in the development of the hypoglossal nucleus.
  • Further research into these developmental patterns can inform clinical understanding of hypoglossal nerve disorders.