Quantitative electron microscopic evidence for reinnervation in the adult rat interpeduncular nucleus after lesions of the fasciculus retroflexus

The Journal of Comparative Neurology
M MurrayG Raisman

Abstract

The method of electron dense degeneration has been used to make a quantitative study of the projection from the habenula through the fasciculus retroflexus (FR) to the interpeduncular nucleus (IPN) in the rat. The IPN si a midline structure onto which the right and left fasciculi converge. In the rostral part of the IPN the fascicular axons from each side form synapses throughout the mediolateral extent of the ventral two-thirs of the nucleus. In the caudal part of the IPN the fascicular axons from each side terminate to an equal extent in two discrete, parasagittal zones, situated one on side in the mid-mediolateral extent of the IPN. These zones contain clusters of neurons located along the course of a characteristic row of arterioles and venules penetrating the IPN from its ventral surface. In both rostral and caudal parts of the IPN the fascicular axons form single synaptic contaerpeduncular neurons, but caudally, in the two parasagittal zones they also form crest synapses. Crest synapses are only found in this part of the IPN. In crest synapses two presynaptic terminals form markedly asymmetrical contacts with the parallel opposing sides of an attenuated dendritic appendage (the crest). After unilateral fascicular lesions ...Continue Reading

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Mar 1, 1984·Neurochemical Research·Z Gottesfeld
Jul 1, 1988·Brain Research·L E Westrum
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May 28, 2016·Neuromolecular Medicine·Ronald S PetraliaPamela J Yao
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Mar 9, 2019·Acta histochemica·Dimka Hinova-PalovaAdrian Paloff
Jul 1, 1986·The Journal of Comparative Neurology·H J GroenewegenW J Nauta

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