Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

Cortical projections to the lower brain stem and spinal cord in the tree shrew (Tupaia glis)

Cortical projections to the lower brain stem and spinal cord in the tree shrew (Tupaia glis) A study was made of corticofugal projections to the lower brain stem and spinal cord in the tree shrew (Tupaia glis). Degeneration resulting from selective ablations of the motor, sensory and frontal cortex in ten animals was studied by the Nauta technique. Following ablations of motor and sensory cortex degeneration was found bilaterally: (1) throughout the rostrocaudal extent of the lateral reticular formation, (2) in all trigeminal sensory nuclei and, (3) in the dorsal column nuclei (contralateral predominance). All three cortical areas projected fibers to the ipsilateral pontine nuclei and bilaterally to the medial reticular formation (ipsilateral predominance). Fibers from the motor cortex were distributed throughout the medial reticular formation; fibers from sensory and frontal cortex were distributed to selective regions of the medial reticular formation. The majority of corticospinal fibers decussated and descended to lower cervical (frontal fibers) and lower thoracic (motor and sensory fibers) levels. The small uncrossed component descended in the ipsilateral dorsal funiculus only throughout cervical segments. Corticospinal degeneration terminated primarily in the internal basilar region (medial half of lamina VI), medial aspect of the neck (lamina V) and, to a lesser extent, in the head (laminae III and IV) of the dorsal horn. Relatively few fibers projected to the zona intermedia (lamina VII) and no terminations were present in the motor nuclei (lamina IX) of the spinal nerves. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Comparative Neurology Wiley

Cortical projections to the lower brain stem and spinal cord in the tree shrew (Tupaia glis)

Download PDF
29 pages

Loading next page...
 
/lp/wiley/cortical-projections-to-the-lower-brain-stem-and-spinal-cord-in-the-FCYYb2VjeF

References (66)

Publisher
Wiley
Copyright
"Copyright © 1967 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
0021-9967
eISSN
1096-9861
DOI
10.1002/cne.901300103
pmid
6033024
Publisher site
See Article on Publisher Site

Abstract

A study was made of corticofugal projections to the lower brain stem and spinal cord in the tree shrew (Tupaia glis). Degeneration resulting from selective ablations of the motor, sensory and frontal cortex in ten animals was studied by the Nauta technique. Following ablations of motor and sensory cortex degeneration was found bilaterally: (1) throughout the rostrocaudal extent of the lateral reticular formation, (2) in all trigeminal sensory nuclei and, (3) in the dorsal column nuclei (contralateral predominance). All three cortical areas projected fibers to the ipsilateral pontine nuclei and bilaterally to the medial reticular formation (ipsilateral predominance). Fibers from the motor cortex were distributed throughout the medial reticular formation; fibers from sensory and frontal cortex were distributed to selective regions of the medial reticular formation. The majority of corticospinal fibers decussated and descended to lower cervical (frontal fibers) and lower thoracic (motor and sensory fibers) levels. The small uncrossed component descended in the ipsilateral dorsal funiculus only throughout cervical segments. Corticospinal degeneration terminated primarily in the internal basilar region (medial half of lamina VI), medial aspect of the neck (lamina V) and, to a lesser extent, in the head (laminae III and IV) of the dorsal horn. Relatively few fibers projected to the zona intermedia (lamina VII) and no terminations were present in the motor nuclei (lamina IX) of the spinal nerves.

Journal

The Journal of Comparative Neurology – Wiley

Published: May 1, 1967

There are no references for this article.