Cortical and spinal somatosensory input to the superior colliculus in the golden hamster: An anatomical and electrophysiological study

1981 ◽  
Vol 195 (3) ◽  
pp. 415-432 ◽  
Author(s):  
Robert W. Rhoades
Keyword(s):  
Superior Colliculus ◽  
Golden Hamster ◽  
Electrophysiological Study ◽  
Somatosensory Input

Topography of visual and somatosensory projections to the superior colliculus of the golden hamster

1978 ◽  
Vol 142 (2) ◽  
pp. 223-235 ◽  
Author(s):  
Barbara L. Finlay ◽  
Sue E. Schneps ◽  
Karen G. Wilson ◽  
Gerald E. Schneider
Keyword(s):  
Superior Colliculus ◽  
Golden Hamster

An electrophysiological study of the visual projection to the superior colliculus of the rat

1966 ◽  
Vol 127 (4) ◽  
pp. 435-444 ◽  
Author(s):  
Robert Siminoff ◽  
Horst Otto Schwassmann ◽  
Lawrence Kruger
Keyword(s):  
Superior Colliculus ◽  
Electrophysiological Study ◽  
Visual Projection

Electrophysiological study of the posterior accessory optic tract

1960 ◽  
Vol 199 (3) ◽  
pp. 522-528 ◽  
Author(s):  
Duco Hamasaki ◽  
Elwin Marg
Keyword(s):  
Optic Nerve ◽  
Superior Colliculus ◽  
Electrophysiological Study ◽  
Optic Tract ◽  
Nerve Fibers ◽  
Medial Geniculate ◽  
Centrifugal Fiber ◽  
Ipsilateral Stimulation ◽  
Electrophysiological Methods ◽  
Stimulation Of

Electrophysiological methods were used to detect the presence of the posterior accessory optic tract—transpeduncular tract in the rabbit. Photic stimulation gave rise to mainly an ‘on’ response from the contralateral nucleus of the transpeduncular tract. Electrical stimulation of the optic nerve fibers evoked a response from this nucleus with a latency of 1–3 msec. A response could not be elicited from the nucleus of the transpeduncular tract, the lateral geniculate nucleus, or the superior colliculus by ipsilateral stimulation. Encéphale isolé preparations showed that the responses recorded under urethane anesthesia were not altered by the drug. The nucleus of the posterior accessory optic tract is situated between the optic nerve and the nucleus of the transpeduncular tract, and lies on the dorsolateral aspect of the midbrain between the superior colliculus and the medial geniculate nucleus. No centrifugal fiber responses have been found which originate from the nucleus of the transpeduncular tract and pass to the retina via the optic nerve.

Projection from dorsal column nuclei to dorsal mesencephalon

1985 ◽  
Vol 53 (1) ◽  
pp. 183-200 ◽  
Author(s):  
L. L. Cooper ◽  
J. O. Dostrovsky
Keyword(s):  
Superior Colliculus ◽  
Inferior Colliculus ◽  
Receptive Fields ◽  
Dorsal Column ◽  
The Body ◽  
Projection Neurons ◽  
Dorsal Column Nuclei ◽  
Wide Range ◽  
Somatosensory Input ◽  
Medial Geniculate

This study investigated the projection from the dorsal column nuclei (DCN) to the dorsal mesencephalon. Single-unit extracellular recordings were obtained from the DCN of alpha-chloralose anesthetized cats. Neurons were identified by standard antidromic stimulation criteria as projecting to the dorsal mesencephalon (M neurons), the diencephalon (D neurons), or to both regions (MD neurons). Fifty-two neurons could be antidromically activated from the dorsal mesencephalon. Of these, 31 could also be antidromically activated by stimulation in the diencephalon. An additional 34 neurons were studied that could be antidromically activated only from the diencephalon. Stimulation sites within the dorsal mesencephalon effective in antidromically activating M and MD neurons were in the caudal ventrolateral superior colliculus, the intercollicular area, and external nucleus of the inferior colliculus. Effective diencephalic stimulation sites were in the ventroposterolateral nucleus, the zona incerta, and the magnocellular division of the medial geniculate. The antidromic latencies to stimulation in the dorsal mesencephalon of M and MD neurons spanned a similar but wide range of values in contrast to the latencies to stimulation in the diencephalon of D neurons which were all short. Conduction velocities along the mesencephalic and diencephalic collaterals of MD neurons were similar. Many of the neurons projecting to the mesencephalon had receptive fields located proximally on the body. Most of the neurons had rapidly adapting responses to low-intensity mechanical stimulation of the skin. The major difference between the mesencephalic M and MD projection neurons and diencephalic projection D neurons was the larger percentage of neurons having proximal receptive fields in the former group. These findings are the first electrophysiological demonstration of a direct somatosensory input to the dorsal mesencephalon arising in the DCN. This input is probably responsible for providing some of the somatosensory input to the deeper layers of the superior colliculus, the external nucleus of the inferior colliculus, and the intercollicular area, regions known to have neurons responding to somatosensory stimuli.

Sign in / Sign up

Export Citation Format

Share Document