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Neuron addition in the postmetamorphic frog.

P B Farel1, P G St Wecker, S E Wray

  • 1Department of Physiology, School of Medicine, University of North Carolina, Chapel Hill 27599.

Experimental Gerontology
|January 1, 1992
PubMed
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As bullfrogs grow, their hindlimb neuron count increases significantly, particularly sensory and sympathetic neurons. This growth is attributed to neuron maturation, not cell division, ensuring functional capacity.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Comparative Anatomy

Background:

  • Understanding how nervous system components scale with body size is crucial in developmental biology.
  • The bullfrog (Rana catesbeiana) provides a model for studying neural adaptation during growth.

Purpose of the Study:

  • To correlate neuron number with body length in bullfrogs.
  • To investigate the mechanisms of neuron addition in growing amphibians.

Main Methods:

  • Neuron counts were performed on somatic motoneurons, sensory neurons, and sympathetic postganglionic neurons innervating the hindlimb.
  • Specimens of varying body lengths were analyzed to establish correlations.

Main Results:

  • Dorsal root and sympathetic ganglion neuron numbers increased two to three times in the largest specimens compared to the smallest.

Related Experiment Videos

  • Hindlimb motoneuron numbers increased by 20%, primarily in the caudal motor pool (60% increase in larger frogs).
  • Evidence suggests neuron addition occurs via maturation of undifferentiated neurons, not cell division.

    • Conclusions:

    • Neuron numbers in the bullfrog hindlimb scale with body length.
    • Maturation of undifferentiated neurons is proposed as the mechanism for maintaining neural function during growth.
    • This finding offers insights into neural plasticity and adaptation in vertebrates.