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Neuroseienee Letters, 160 (1993) 209 213 209 1993Elsevier Scientific Publishers Ireland Ltd. All fights reser'/ed 0304-3940/93/$ 06.00 -
 

Summary: Neuroseienee Letters, 160 (1993) 209 213 209
1993Elsevier Scientific Publishers Ireland Ltd. All fights reser'/ed 0304-3940/93/$ 06.00 -
NSL 09823
Spinothalamocortical inputs nonpreferentially innervate the superficial
and deep cortical layers of SI
Ting Shi, Richard T. Stevens, Jeff Tessier and A. Vania Apkarian
Department of Neurosurgery, SUN Y Health Science Center, Syracuse, N Y 13210 (USA)
(Received 15 March 1993;Revised version received 10June 1993;Accepted 14June 1993)
Key words." Spinothalamic terminal; Thalamocortical cell; Anterograde transport; Retrograde transport; Squirrel monkey; Macaque monkey;
Nociception
Using a combined anterograde and retrograde tracing technique, weexamined the distribution pattern of the thalamocortical cellswhich projected
to superficial layers of the hand region of the primary somatosensory cortex (hSI), and quantitatively analyzed the retrogradely labeled cells which
putatively contacted terminals of the spinothalamic tract (STT) in the squirrel monkey and the macaque. Less than 25% of the superficial hSl
projecting cellswere putatively contacted by terminals of cervical enlargement spinothalamic neurons. These cellswere primarily located in ventro-
posterior lateral, ventroposterior inferior and centrolateral nuclei. Although the number of superficial hSI projecting cells numbered less than 20%
of the total hSI projecting cells, their patterns of location and their proportion of overlap with STT terminals within each thalamic nucleus were
similar. It is suggested that the spinothalamic nociceptive information input to the cortex equally accessesboth superficial and deep SI.
The spinothalamic tract (STT) is the major direct spi-
nal cord pathway signaling somatic and visceral nocicep-
tive stimuli (see refs. 10, 22). In primates, the STT termi-

  

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

 

Collections: Biology and Medicine