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Morphological and morphometric study on human Scarpa ganglion development.

Ana Sanchez Del Rey1, Jose M Sánchez Fernández, Nuria Gutierrez

  • 1Otorhinolaryngology Department, School of Medicine, University of the Basque Country, UPV/EHU, Bilbao, Vizcaya, Spain. ana.sanchezdelrey@ehu.es

Acta Oto-Laryngologica
|January 29, 2013
PubMed
Summary

Scarpa neuron size increases and nuclear-to-cytoplasm ratio decreases with fetal development. Neuron displacement within the internal auditory meatus (IAM) is observed from early fetal stages through neonates.

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Area of Science:

  • Developmental anatomy
  • Neuroscience
  • Histomorphometry

Background:

  • The Scarpa ganglion, a sensory ganglion of the vestibulocochlear nerve, plays a crucial role in balance and hearing.
  • Understanding its developmental changes is vital for comprehending auditory and vestibular system formation.

Purpose of the Study:

  • To investigate the histomorphometric changes in the Scarpa ganglion during human fetal development.
  • To analyze the spatial positioning of Scarpa ganglion neurons within the internal auditory meatus (IAM) throughout gestation.

Main Methods:

  • Light microscopic histomorphometric analysis of Scarpa ganglia from human fetuses (45-270 mm crown-rump-length) and a neonate (360 mm).
  • Measurement of cell area, nuclear area, ganglion area, and Scarpa ganglion neuron distances to the IAM endocranial porus.

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Main Results:

  • Scarpa neuron cell and nuclear area increased, while the nuclear/cytoplasm ratio decreased with advancing fetal age (p < 0.0001).
  • Statistically significant differences in cell area were noted between most fetal groups, except for the 45-74 mm CRL interval.
  • Neuron displacement within the IAM was observed from 9 weeks of gestation through the neonatal period.

Conclusions:

  • Scarpa neuron morphology undergoes significant changes during human fetal development, characterized by growth and altered nuclear-cytoplasm proportions.
  • The anatomical positioning of Scarpa ganglion neurons within the IAM evolves during development, with displacement occurring progressively.