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Brain inputs to the vestibular nuclei in lampreys
Cecilia Jiménez-López1, Paula Rivas-Ramírez1, Carmen Núñez-González1
1CINBIO, Universidade de Vigo, Neurocircuits Group, Campus Universitario Lagoas Marcosende, Vigo, Spain.
Lamprey vestibular nuclei are interconnected with scarce external inputs, primarily from the pretectum and thalamus. This suggests early vertebrate evolution established visuovestibular integration for gaze stabilization.
Area of Science:
- Neuroscience
- Evolutionary Biology
- Comparative Anatomy
Background:
- The vestibulo-ocular reflex (VOR) and optokinetic reflex (OKR) are crucial for gaze stabilization by preventing image blurring.
- In vertebrates, the VOR relies on direct projections from vestibular nuclei to motor nuclei controlling eye muscles.
- Lamprey vestibular nuclei are well-defined regarding projections and sensory inputs, but their interconnections and external inputs are less understood.
Purpose of the Study:
- To investigate the connectivity and external inputs of lamprey vestibular nuclei.
- To understand the evolutionary origins of visuovestibular integration in vertebrates.
Main Methods:
- Tracer injections were used to map neural projections.
- Extracellular electrophysiological recordings analyzed neural activity and inputs.
Main Results:
- Lamprey vestibular nuclei exhibit extensive internal interconnectivity.
- Inputs from other brain regions to the vestibular nuclei are limited.
- The pretectum and ventral thalamus are the primary sources of ipsilateral input to the vestibular nuclei.
Conclusions:
- The interconnectedness of vestibular nuclei is an ancient trait dating back to early vertebrate evolution.
- Pretectal input to vestibular nuclei highlights the early importance of visual-vestibular integration for gaze and body stabilization.
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