Summary
The cerebellar projection of the external cuneate nucleus and the adjoining rostral part of the internal cuneate nucleus were investigated by means of anterograde transport of tritiated leucine. The cuneocerebellar tract terminates as mossy fiber rosettes in the granular layer. The termination area has a more or less spherical form with its centre at the ipsilateral side. It comprises the anterior and posterior vermes bilaterally and the ipsilateral hemispheral parts of the anterior and simple lobules, the medial aspect of the ansiform lobule and the paramedian lobule. Within this area the mossy fiber terminals are arranged in continuous sagittal strips, some of them clearly separated from one another. The strips were found in the cerebellar modules A-D. Concomitant bilateral projections to several subdivisions of the inferior olive were found. Some of these provide the anatomical substrate for the simultaneous activation of a number of mossy and climbing fiber zones observed in the anterior lobe following stimulation of different forelimb nerves. No evidence was found for a termination of mossy fiber collaterals in the central cerebellar nuclei.
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Abbreviations
- β:
-
subnucleus β
- bp:
-
brachium pontis
- CCT:
-
cuneocerebellar tract
- CE:
-
nucleus cuneatus externus
- cf:
-
climbing fiber
- CI:
-
nucleus cuneatus internus
- cr:
-
corpus restiforme
- DAO:
-
dorsal accessory olive
- DCN:
-
dorsal column nuclei
- DF-SOCP:
-
dorsal funiculus spino-olivocerebellar pathway
- dl:
-
dorsal lamina of the PO
- dmcc:
-
dorso-medial cell column
- DV:
-
nucleus vestibularis descendens
- E-CCP:
-
exteroceptive cuneocerebellar pathway
- F:
-
nucleus fastigii
- FL:
-
flocculus
- flm:
-
fasciculus longitudinalis medialis
- G:
-
nucleus gracilis
- HRP:
-
horseradish peroxidase
- HVI:
-
hemisphere of lobule VI (Roman numerals)
- IA:
-
nucleus interpositus anterior
- IP:
-
nucleus interpositus posterior
- L:
-
nucleus lateralis
- MAO:
-
medial accessory olive
- mf:
-
mossy filber
- mft:
-
mossy fiber terminal
- MV:
-
nucleus vestibularis medialis
- PAR:
-
lobus paramedianus
- PFLD:
-
dorsal paraflocculus
- PFLV:
-
ventral paraflocculus
- PH:
-
nucleus prepositus hypoglossi
- PO:
-
principal olive
- P-CCP:
-
proprioceptive cuneocerebellar pathway
- rV:
-
ramus descendens of the nucleus trigeminus
- TS:
-
nucleus solitarius
- Vi:
-
pars interpolaris of the nucleus trigeminus
- vl:
-
ventral lamina of the PO
- I-X:
-
lobules I to X (Roman numerals)
- XII:
-
nucleus hypoglossi (Roman numerals)
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Gerrits, N.M., Voogd, J. & Nas, W.S.C. Cerebellar and olivary projections of the external and rostral internal cuneate nuclei in the cat. Exp Brain Res 57, 239–255 (1985). https://doi.org/10.1007/BF00236529
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DOI: https://doi.org/10.1007/BF00236529