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Mol Cell Neurosci. 2000 Jul;16(1):14-26.

Role of the target in the pathfinding of facial visceral motor axons.

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  • 1MRC Centre for Developmental Neurobiology, King's College, Guy's Campus, 4th Floor New Hunt's House, London, SE1 9RT, United Kingdom.


Axon navigation depends, in part, on guidance cues emanating from the target. We have investigated the possible role of the target in the pathfinding of visceral motor axons to cranial parasympathetic ganglia. Mice homozygous for a tau-LacZ transgene targeted in the Phox2a locus lack the sphenopalatine ganglion, which is the normal target of visceral motor axons of the facial nerve. We found that in these mutants, facial visceral motor axon pathfinding was disrupted, and some axons were misrouted to an alternative parasympathetic ganglion. Moreover, the absence of correct facial visceral motor pathways was concomitant with defects in the pathfinding of rostrally-projecting sympathetic axons.

Copyright 2000 Academic Press.

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