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[The selachian terminal nerve].

C C Wu1, M Yoshimoto, H Ito

  • 1Department of Anatomy, Nippon Medical School, Tokyo, Japan.

Kaibogaku Zasshi. Journal of Anatomy
|August 1, 1992
PubMed
Summary
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The terminal nerve in sharks exhibits significant species and individual variations in its structure and connections. FMRF-amide immunoreactivity suggests a role in sensory processing within the brain.

Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Ichthyology

Context:

  • The terminal nerve's morphology and function remain incompletely understood, particularly in cartilaginous fishes.
  • Understanding its variations is crucial for deciphering sensory pathways in elasmobranchs.

Purpose:

  • To clarify the morphology and function of the terminal nerve in 9 species of selachians.
  • To investigate the terminal nerve's gross anatomy, histology, and FMRF-amide immunoreactivity.

Summary:

  • Gross examinations revealed species-specific differences in the terminal nerve's peripheral and central branches, ganglia, and telencephalic entry points.
  • Histological and electron microscopic analyses showed encapsulated ganglia with unipolar/bipolar cells containing dense-cored vesicles.
  • FMRF-amide immunoreactivity was observed in ganglion cells and fibers terminating in septal and preoptic areas, with potential ectopic cells in olfactory nerves.

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Impact:

  • This study highlights the significant variability of the terminal nerve across shark species.
  • Identifies FMRF-amide as a key neurochemical marker in the terminal nerve system.
  • Provides foundational data for future research on elasmobranch neuroanatomy and sensory systems.