Abstract
Ultrastructural changes in the pineal ganglion of the ferret were studied after lesions placed either in the habenula, the stria medullaris or the posterior commissure, and after bilateral superior cervical ganglionectomy. Degenerative changes were observed in axon terminals in the pineal ganglion after habenular lesions, and these changes were most marked 10–15 days after operation. Ferrets with lesions in the stria medullaris showed degenerating axon terminals in the habenula, but not in the pineal ganglion. Posterior commissural lesions resulted in degenerated myelinated fibres becoming visible in the pineal ganglion, but its axon terminals appeared normal. Superior cervical ganglionectomy had no detectable effect on the electron microscopic appearance of the pineal ganglion. These experiments demonstrate a direct link between the habenula, a structure within the CNS, and the pineal ganglion in ferrets.
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