Central trigeminal and posterior eighth nerve projections in the turtle Chrysemys picta studied in vitro

Brain, Behavior and Evolution
J L Herrick, J Keifer

Abstract

Recent electrophysiological studies in the turtle Chrysemys picta have suggested that a neural correlate of the eye-blink reflex can be evoked in an in vitro brain-stem-cerebellum preparation by electrical rather than natural stimulation of the cranial nerves. Discharge recorded in the abducens nerve, which is similar to EMG recordings from extraocular muscles during eye retraction, is triggered by a brief electrical stimulus applied to the ipsilateral trigeminal nerve. Evidence also suggests that pairing a one-second electrical stimulus applied to the posterior eighth nerve immediately prior to a single shock to the trigeminal nerve results in classically conditioned abducens nerve discharge in response to the previously neutral eighth nerve stimulus. In view of these physiological findings, the aim of the present study was to examine the central projections of trigeminal and posterior eighth nerve inputs to elucidate the anatomical substrates that may underlie the in vitro eye-blink reflex and possible pathways involved in reflex conditioning. Neurobiotin (NB) or fluorescein dextran (FD) was pressure injected into the cut end of either the trigeminal or posterior eighth nerve of the in vitro brainstem-cerebellum. Following tr...Continue Reading

Citations

Jul 9, 2010·Brain Imaging and Behavior·Joseph C WildenbergMary E Meyerand
Aug 21, 2004·Brain, Behavior and Evolution·Dantong Zhu, Joyce Keifer
Jun 21, 2006·The Journal of Comparative Neurology·Henning Schneider, Beth Sulner
Oct 30, 2020·Frontiers in Human Neuroscience·Christopher J SmithRyan C N D'Arcy

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