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Bruin Research, 555 (1991) 10-in 1991 Elsevier Science Publishers B.V. All rights reserved. I)006-8993/91/$03.50

Summary: 10
BRES 16813
Bruin Research, 555 (1991) 10-in
1991 Elsevier Science Publishers B.V. All rights reserved. I)006-8993/91/$03.50
A DONIS 000689939116813T
Thalamically projecting cells of the lateral cervical nucleus in monkey
Mark V. Smith and A. Vania Apkarian
Neurosurgery Research Laboratories, S UNY Health Science Center, 3118 Weiskotten Hall, Syracuse, NY 13210 (U.S.A.)
(Accepted 26 February 1991)
Key words: Horseradish Peroxidase; Spinal cord; Macaca; Saimiri; Cell count
The number, location, and morphology of thalamically projecting lateral cervical nucleus (LCN) cells were determined in monkey using
retrograde transport of wheatgerm agglutinin-conjugated horseradish peroxidase. These data were compared to the total population of LCN
neurons as determined by Nissl stain. In 4 Macaca fascicularis and one Saimiri sciureus the average size of the thalamic projection from LCN
was found to be 506 _+ 94 cells contralateral to the injections. Thalamically projecting LCN neurons were located between the lower medulla
and the third cervical segment; approximately 90% of these cells were in the first two cervical segments. Morphologic analysis of thalamically
projecting LCN cells showed that they were smaller in size, and more oblong in shape in caudal regions of the nucleus. In 3 macaques, the
average total number of LCN cells was determined to be 1617 + 908 on one side, in Nissl material. In these Nissl-stained preparations LCN
neurons were found as far caudal as the fourth cervical segment; 68% were located in the first two cervical segments. Hence, thalamically
projecting LCN neurons in the monkey are located in the rostral portion of the nucleus and comprise about one-third of the total population.
Comparison of these data with reports in the literature imply that, unlike the cat, the major projection from LCN in monkeys is to the


Source: Apkarian, A. Vania - Department of Physiology, Northwestern University


Collections: Biology and Medicine