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Afferents of the caudal fastigial nucleus in a New World monkey (Cebus apella)

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Summary

The afferents of the fastigial nucleus (FN) were studied in two capuchin monkeys (Cebus apella) one of which had received a unilateral injection of horseradish peroxidase in the caudal FN, and a second monkey which received a control injection that involved the lateral caudal FN but extended into the cerebellar white matter between the FN and posterior interposed nucleus (PIN). All of the sources of FN afferents were found to be labeled bilaterally. In addition to the restricted distribution of labeled Purkinje cells in lobules VI and VII of the posterior lobe vermis (“oculomotor vermis”), retrogradely labeled cells were present in the dorsolateral pontine nucleus (DLPN), dorsomedial pontine nucleus (DMPN), nucleus reticularis tegmenti pontis (NRTP), pontine raphe (PR), paramedian nucleus reticularis pontis caudalis (NRPC), nucleus prepositus hypoglossi (NPH), subnucleus b of the medial accessory olivary nucleus (sbMAO), and vestibular complex (VC). The second (control) injection appeared to confirm a proposed (Langer et al. 1985b) projection from the flocculus to the basal interstitial nucleus. The results are discussed in terms of the functional relationships of the FN to the frontal eye field and oculomotor-related brainstem structures involved in the production of saccadic and smooth pursuit eye movements.

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Abbreviations

AIN:

anterior interposed nucleus, cerebellum

BC:

brachium conjunctivum (sup. cerebellar peduncle)

BIN:

basal interstitial nucleus, cerebellum

BPN:

basilar pontine nuclei

CS:

corticospinal (pyramidal) tract

DBC:

decussation of brachium conjunctivum

DLPN:

dorsolateral pontine nucleus (Nyby and Jansen 1951)

DMPN:

dorsolateral pontine nucleus

DN:

dentate nucleus, cerebellum

DNV:

descending nucleus of the trigeminal complex (C.N. V)

FN:

fastigial nucleus, cerebellum

IC:

inferior colliculus

ICP:

inferior cerebellar peduncle

IVN:

inferior vestibular nucleus

LCN:

lateral (external) cuneate nucleus

LPN:

lateral pontine nucleus

MAO:

medial accessory nucleus of the inferior olivary complex

ML:

medial lemniscus

MLF:

medial longitudinal fasciculus

MRF:

medullary reticular formation (nuc. retic. gigantocellularis)

MVN:

medial vestibular nucleus

NI:

nucleus intercalatus of Staderini of the perihypoglossal complex

NPH:

nucleus prepositus hypoglossi

NRPC:

nucleus reticularis pontis caudalis

NRPO:

nucleus reticularis pontis oralis

NRTP:

nucleus reticularis tegmenti pontis

PIN:

posterior interposed nucleus

PR:

pontine raphe

sbMAO:

subnucleus b, medial accessory olivary nucleus

SC:

superior colliculus

sbPVG:

supragenial peri- (IVth) ventricular gray

SVN:

superior vestibular nucleus

VIn:

abducens nerve (C.N. VI)

XIIn:

hypoglossal nerve (C.N. XII)

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Gonzalo-Ruiz, A., Leichnetz, G.R. Afferents of the caudal fastigial nucleus in a New World monkey (Cebus apella). Exp Brain Res 80, 600–608 (1990). https://doi.org/10.1007/BF00227999

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  • DOI: https://doi.org/10.1007/BF00227999

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