Anatomical evidence for interconnections between the central mesencephalic reticular formation and cervical spinal cord in the cat and macaque.

The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology
Susan WarrenPaul J May

Abstract

A gaze-related region in the caudal midbrain tegementum, termed the central mesencephalic reticular formation (cMRF), has been designated on electrophysiological grounds in monkeys. In macaques, the cMRF correlates with an area in which reticulotectal neurons overlap with tectoreticular terminals. We examined whether a region with the same anatomical characteristics exists in cats by injecting biotinylated dextran amine into their superior colliculi. These injections showed that a cat cMRF is present. Not only do labeled tectoreticular axons overlap the distribution of labeled reticulotectal neurons, these elements also show numerous close boutonal associations, suggestive of synaptic contact. Thus, the presence of a cMRF that supplies gaze-related feedback to the superior colliculus may be a common vertebrate feature. We then investigated whether cMRF connections indicate a role in the head movement component of gaze changes. Cervical spinal cord injections in both the cat and monkey retrogradely labeled neurons in the ipsilateral, medial cMRF. In addition, they provided evidence for a spinoreticular projection that terminates in this same portion of the cMRF, and in some cases contributes boutons that are closely associated w...Continue Reading

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Citations

Oct 12, 2010·Brain Structure & Function·Huazheng LiangCharles Watson
Oct 11, 2013·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Niping WangPaul J May
Oct 22, 2008·The Journal of Physiology·K StecinaE Jankowska
Nov 30, 2015·Brain Structure & Function·Paul J MayAnja K E Horn
Aug 1, 2009·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Eddie PerkinsPaul J May
May 25, 2011·Journal of Chemical Neuroanatomy·Jung-Won ShinArthur D Loewy

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