PMID: 9634140Jun 20, 1998Paper

Dual morphology and topography of the corticothalamic terminals originating from the primary, supplementary motor, and dorsal premotor cortical areas in macaque monkeys

The Journal of Comparative Neurology
E M RouillerE Welker

Abstract

In the motor, somatosensory, and auditory systems of rodents and cats, the corticothalamic connection is composed of a main projection formed by small endings and a minor projection terminating with giant endings. To establish whether the corticothalamic projection originating from motor cortical areas in primates exhibits the same duality, the anterograde tracer biotinylated dextran amine was injected in eight macaque monkeys in the primary motor (M1; n = 3), the supplementary motor (SMA; n = 3) and the dorsal premotor (PMd; n = 2) cortical areas to label corticothalamic axons. The corticothalamic projection originating from these three motor cortical areas was characterized by the presence of axon terminals constituting the same two types of endings, observed both as boutons en passant and terminaux. The population of small endings exhibited a mean cross-sectional maximum diameter of 0.95 microm (S.D. = 0.23), a range of diameters not overlapping that of giant endings (mean diameter = 3.46 microm, S.D. = 0.74 microm). Topographically, the giant endings originating from M1 were located in the same thalamic nucleus (ventroposterolateral nucleus, oral part) in which the small endings were found. In contrast, the giant endings or...Continue Reading

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Citations

Jun 7, 2005·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Stewart Shipp
Oct 20, 2011·Neuroreport·William S Anderson, Frederick A Lenz
Mar 3, 2012·Brain : a Journal of Neurology·Rick C HelmichBastiaan R Bloem
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Jul 24, 2021·Cerebral Cortex Communications·Reza Abbas FarishtaChristian Casanova

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