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The Rhombencephalon of Python Reticulatus, a Snake Possessing Infrared Receptors

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

An architectonic study has been prepared as a precursor to an experimental investigation of the projections of the trigeminal nerve of Python reticulatus. Though based mainly on normal material, the results of certain degeneration experiments have been incorporated. Attention is drawn to certain controversial topics and the differences with other reptilian brains. The organization of the cerebello-spinal and vestibulo-spinal tracts and the presence of ascending fibres within the solitary tract are discussed, but need further experimental investigation for their complete elucidation. The definition of the dorsal spino-cerebellar tract is controversial and the vision of JACOBS (1968) is followed. Some evidence is presented for the assumption that the hypoglossal nucleus has migrated laterally. The trigeminal system differs markedly from that of other vertebrates through the presence of an additional sensory system: the lateral descending trigeminal tract and nucleus.

Affiliations: 1: (Institute of Veterinary Anatomy, State University Utrecht, Bekkerstraat 141, Utrecht, The Netherlands


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