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Experimental Brain Research

, Volume 65, Issue 1, pp 200–212 | Cite as

The cerebellotectal pathway in the grey squirrel

  • P. J. May
  • W. C. Hall
Regular Papers

Summary

In the well laminated superior colliculus of the grey squirrel the cells of origin of the crossed descending pathway to the brainstem gaze centers are contained within the inner sublamina of the intermediate grey layer. The technique of anterograde transport of horseradish peroxidase was used to determine whether the pathway from the cerebellum to the superior colliculus terminates in this region. The technique of retrograde transport of horseradish peroxidase was used to localize the source of this pathway within the cerebellum and to determine the morphology of the cerebellotectal neurons. The grey squirrel cerebellotectal pathway provides two terminal fields to the superior colliculus: a diffuse projection into the deep grey layer and a more concentrated, interrupted projection into the inner sublamina of the intermediate grey layer. The more concentrated projection overlies precisely the tectal sublamina that contains the cells of origin of the predorsal bundle. In contrast to animals with frontal eyes, the cerebellotectal pathway in the grey squirrel was found to project almost entirely contralaterally and the vast majority of the cells of origin for the pathway were distributed ventrally, in the caudal pole of the posterior interpositus nucleus and the adjacent region of the dentate. The labelled cells in both cerebellar nuclei were large and displayed similar morphologies.

Key words

Superior colliculus Cerebellum Deep cerebellar nuclei Predorsal bundle Deep tectal layers 

Abbreviations

BC

Brachium conjunctivum

BP

Brachium pontis

CN

Cochlear nuclei

D

Dentate nucleus of the cerebellum

DLG

Dorsal lateral geniculate nucleus

DLPG

Dorsal lateral pontine grey

I

Interpositus nucleus of the cerebellum

IC

Inferior colliculus

III

Oculomotor nucleus

IO

Inferior olive

ITB

Ipsilateral tectobulbar pathway

F

Fastigial nucleus of the cerebellum

MG

Medial geniculate nucleus

NRTP

Nucleus reticularis tegmenti pontis

OPT

Stratum opticum

PAG

Periaqueductal grey

PDB

Predorsal bundle

PB

Parabigeminal nucleus

PH

Prepositus hypoglossi

PUL

Pulvinar nucleus

PT

Pretectum

RN

Red nucleus

SAI

Stratum album intermediale (intermediate white layer)

SAP

Stratum album profundum (deep white layer)

SGI

Stratum griseum intermediale (intermediate grey layer)

SGP

Stratum griseum profundum (deep grey layer)

SGS

Stratum griseum superficiale (superficial grey layer)

SN

Substantia nigra

sV

Sensory division of the trigeminal complex

Ve

Vestibular nuclei

VII

Facial nucleus

VLG

Ventral lateral geniculate nucleus

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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • P. J. May
    • 1
  • W. C. Hall
    • 1
  1. 1.Department of AnatomyDuke University Medical CenterDurhamUSA

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