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J Neurophysiol (June 14, 2006). doi:10.1152/jn.00334.2006
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Submitted on March 30, 2006
Accepted on June 8, 2006

MORPHOLOGY AND PHYSIOLOGY OF THE CEREBELLAR VESTIBULOLATERAL LOBE PATHWAYS LINKED TO OCULOMOTOR FUNCTION IN THE GOLDFISH

Hans Straka1*, James C Beck2, Angel M. Pastor3, and Robert Baker2

1 CNRS, UMR 7060, Universite Paris 5, LNRS, Paris, France
2 Physiology & Neuroscience, NYU School of Medicine, New York, New York, United States
3 Fisiologia y Zoologia, Universidad de Sevilla, Sevilla, Spain

* To whom correspondence should be addressed. E-mail: hans.straka{at}univ-paris5.fr.

Intracellular recording and single cell labeling were combined to investigate the oculomotor circuitry of the goldfish cerebellar vestibulolateral lobe, comprising the eminentia granularis (Egr) and caudal lobe. Purkinje cells exhibiting highly conserved vertebrate electrophysiological and morphological properties provide the direct output from the caudal lobe to the vestibular nuclei. Biocytin label of the Egr distinguished numerous hindbrain precerebellar sources that could be divided into either putative mechano- or vestibulosensitive nuclei based on cellular location and axon trajectories. Precerebellar neurons in a hindbrain nucleus, called Area II, were electrophysiologically characterized after antidromic activation from the Egr (>50% bilateral) and their morphology analyzed after intracellular biocytin labeling (n = 28). Bipolar spindle-shaped somas ranged widely in size with comparably scaled dendritic arbors exhibiting largely closed field configuration. Area II neurons (85%) projected to the ipsilateral Egr with most (93%) sending a collateral through the cerebellar commissure to the contralateral Egr; however, 15% projected to the contralateral Egr by crossing in the ventral hindbrain. Axon terminals in the vestibular nucleus were the only collaterals within the hindbrain. Every Area II neuron received a disynaptic EPSP after contralateral horizontal canal nerve stimulation and a disynaptic IPSP, preceded by a small EPSP (>50%), after ipsilateral activation. Vestibular synaptic potentials were of varying shape/amplitude, unrelated to neuron location in the nucleus, and thus likely a correlate of somadendritic size. The exceptional separation of eye position and eye velocity signals into two separate hindbrain nuclei represents an ideal model for understanding the precerebellar projection to the vestibulocerebellum.




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J. C. Beck, P. Rothnie, H. Straka, S. L. Wearne, and R. Baker
Precerebellar Hindbrain Neurons Encoding Eye Velocity During Vestibular and Optokinetic Behavior in the Goldfish
J Neurophysiol, September 1, 2006; 96(3): 1370 - 1382.
[Abstract] [Full Text] [PDF]




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