Transsynaptic tracing of conditioned eyeblink circuits in the mouse cerebellum

▶eGFP-expressing PRV injected into mouse orbicularis oculi muscle. ▶Neurons labeled unilaterally in facial nucleus; bilaterally in red nucleus, DCN, and CbCtx. ▶Novel eyeblink-related neurons found in the ventrolateral red nucleus. ▶Multiple parallel and nonoverlapping motor circuits found in cerebellar cortex.