Neurons in the lateral sacral cord of the cat project to periaqueductal grey, but not to thalamus

Previous work of our laboratory has shown that neurons in the lateral sacral cord in cat project heavily to the periaqueductal grey (PAG), in all likelihood conveying information from bladder and genital organs. In humans this information usually does not reach consciousness, which raises the questi...

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Bibliographic Details
Published in:The European journal of neuroscience 2005-04, Vol.21 (8), p.2159-2166
Main Authors: Klop, Esther Marije, Mouton, Leonora J., Kuipers, Rutger, Holstege, Gert
Format: Article
Language:English
Subjects:
Afferent Pathways - anatomy & histology
Animals
Brain Mapping
Cats
Efferent Pathways - anatomy & histology
Female
Laminectomy - methods
mating behaviour
micturition
Neurons - metabolism
Neurons - physiology
Periaqueductal Gray - anatomy & histology
Spinal Cord - cytology
spinothalamic tract
Thalamus - anatomy & histology
visceral
Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate - metabolism
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Summary:Previous work of our laboratory has shown that neurons in the lateral sacral cord in cat project heavily to the periaqueductal grey (PAG), in all likelihood conveying information from bladder and genital organs. In humans this information usually does not reach consciousness, which raises the question of whether the lateral sacral cell group projects to the thalamus. After wheatgerm agglutinin‐horseradish peroxidase (WGA‐HRP) injections into the sacral cord, anterogradely labelled fibers were found in the thalamus, specifically in the ventral anterior and ventral lateral nuclei, the medial and intralaminar nuclei, the lateral ventrobasal complex/ventroposterior lateral nucleus, and the nucleus centre médian, lateral to the fasciculus retroflexus. Much denser projections were found to the central parts of the PAG, mainly to its dorsolateral and ventrolateral parts at caudal levels and lateral parts at intermediate levels. In a subsequent retrograde tracing study, injections were made in those parts of the thalamus that received sacral fibers, as found in the anterograde study. Labelled neurons were observed in the sacral cord, but not in the lateral sacral cell group. In contrast, a small control injection in the caudal PAG resulted in many labelled neurons in the lateral sacral cord. These results suggest that afferent information regarding micturition and sexual behaviour is relayed to the PAG, rather than to the thalamus.
ISSN:0953-816X
1460-9568
DOI:10.1111/j.1460-9568.2005.04039.x