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Related Experiment Videos

[Development of the human facial nucleus: a morphometric study].

T Nara, N Goto, H Nozaki

    No to Hattatsu = Brain and Development
    |September 1, 1989
    PubMed
    Summary

    Human facial nucleus development shows neuron size and complexity increase after 30 weeks gestation. Subnuclei form early, with the medial subnucleus being smaller. Neuron numbers remain stable, though some degeneration occurs.

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    Neurology·2011

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Human Anatomy

    Context:

    • The human facial nucleus is crucial for motor control of facial muscles.
    • Understanding its development aids in diagnosing and treating neurological disorders affecting facial movement.
    • Previous research has focused on broader brain development, with less specific detail on the facial nucleus's intricate maturation process.

    Purpose:

    • To investigate the developmental trajectory of the human facial nucleus from fetal stages to adulthood.
    • To identify key morphometric changes and cytoarchitectural organization during human facial nucleus development.
    • To establish normative data for facial nucleus development across different gestational ages and life stages.

    Summary:

    • Morphometric analysis of human fetal brains (21-40 weeks gestation), an infant, and an adult revealed significant neuronal growth, Nissl body increase, and process/neuropil elongation after 30 weeks gestation.

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  • The facial nucleus exhibits distinct cytoarchitectural subnuclei (dorsal, medial, intermediate, ventromedial, ventrolateral, lateral) by 21 weeks gestation, with the medial subnucleus showing smaller neuron sizes.
  • Neuronal counts remained consistent across ages, with approximately 10% neuronal degeneration observed at 21 and 33 weeks gestation, indicating a dynamic developmental process.

    • Impact:

    • Provides a detailed timeline of human facial nucleus maturation, essential for understanding normal development.
    • Offers insights into potential critical periods for developmental abnormalities affecting facial nerve function.
    • Establishes a foundational dataset for comparative studies in neurodevelopmental disorders and evolutionary biology.