PMID: 3760545Jan 1, 1986Paper

The nucleus "k" of Meessen and Olszewski efferents to the cerebellar paramedian lobule: a retrograde tracing histochemical (HRP) study in the rabbit and the cat

Journal für Hirnforschung
K GrottelD Jakielska

Abstract

The group "k" of Meessen and Olszewski (1949) was identified in the brain stems of normal rabbits and cats. In the rabbit, a topographical subdivision of the group "k" into the well defined cell aggregations k1, k2 and k3 was found. In the cat, the nucleus corporis pontobulbaris was subdivised into a posterodorsal and a anteroventral part. The former was located ventrally to the motor and principal sensory trigeminal nuclei, the latter was wedgeshaped and situated more anteriorly at the lateroventral margin of the pons. In 9 rabbits and 7 cats the neurons of origin for cerebellar paramedian lobule afferents were identified with retrograde transport of horseradish peroxidase within the nucleus "k" and nucleus corporis pontobulbaris, respectively. In both species, most projections to the paramedian lobule were seen as originating ipsilaterally with only a small contralateral component. The study suggests that there are certain segregated projections of the nucleus "k" or the nucleus corporis pontobulbaris to the cortex of the anterior and posterior parts of the paramedian lobule, with some valid species differences. In the cat, the whole projection was found to originate in the more anterior and ventral parts of the nucleus "k" (...Continue Reading

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