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Organization of afferent connections to cuneocerebellar tract

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1.The afferent connections to 180 cuneocerebellar tract (CCT) neurones were studied in the cat. The neurones were classified into two groups, proprioceptive and exteroceptive.2.The proprioceptive neurones (P-CCT) occurred in the external cuneate nucleus and were monosynaptically activated by group I muscle afferents. About 60 of these neurones received additional excitation from group II muscle afferents.3.The P-CCT neurones received excitation from one nerve only.4.The P-CCT neurones received postsynaptic inhibition from muscle nerves not supplying excitation.5.The exteroceptive neurones (E-CCT) occurred in the main cuneate nucleus and received di- and polysynaptic excitation from cutaneous afferents. Most neurones received additional excitation from high threshold muscle afferents. The latter originated from receptors that were sometimes activated by pressure against deep structures but seldom, if ever, from slowly adapting stretch receptors in muscle.6.The E-CCT neurones were usually activated from several skin and muscle nerves.7.Stimulation of the sensorimotor area of the cerebral cortex evoked inhibition in some P-CCT neurones and excitation and/or inhibition in some E-CCT neurones.8.The afferent organization of the CCT is compared with that of the dorsal spinocerebellar tract. The information carried by the two tracts is discussed.

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