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[Autonomic corticofugal fibers]
Bulletin De L'Association Des Anatomistes
|December 1, 1976
Summary
Neocortical lesions in cats reveal Wallerian degeneration pathways to brainstem and spinal cord effector nuclei. Direct and intercalary corticofugal fibers project to autonomic control centers.
Area of Science:
- Neuroscience
- Neuroanatomy
Context:
- Investigates corticofugal projections from the neocortex.
- Utilizes silver impregnation techniques (Nauta, Fink-Heimer, Velayos-Ullán).
Purpose:
- To trace the anatomical pathways of degenerating fibers originating from neocortical lesions.
- To identify specific brainstem and spinal cord nuclei targeted by corticofugal projections.
Summary:
- Lesions in the cat neocortex induced Wallerian degeneration.
- Degenerating fibers projected to vegetative effector nuclei, including the vagus nerve nucleus and spinal cord intermediate zones.
- Numerous corticofugal fibers exhibited intercalary formation through reticular and solitary tract nuclei.
Impact:
- Provides detailed neuroanatomical mapping of corticofugal pathways.
- Enhances understanding of central nervous system control over autonomic functions.
- Establishes direct and indirect fiber connections to thoracic and sacral autonomic nuclei.