The linear nucleus (Li) was identified in 1978 from its projections to the cerebellum. However, there is no systematic study of its connections with other areas of the central nervous system possibly due to the challenge of injecting retrograde tracers into this nucleus. The present study examines its afferents from some nuclei involved in motor and cardiovascular control with anterograde tracer injections. BDA injections into the central amygdaloid nucleus result in labeled fibers to the ipsilateral Li. Bilateral projections with an ipsilateral dominance were observed after injections in a) jointly the paralemniscal nucleus, the noradrenergic group 7/ Köllike -Fuse nucleus/subcoeruleus nucleus, b) the gigantocellular reticular nucleus, c) and the solitary nucleus/the parvicellular/intermediate reticular nucleus. Retrogradely labeled neurons were observed in Li after BDA injections into all these nuclei except the central amygdaloid and the paralemniscal nuclei. Our results suggest that Li is involved in a variety of physiological functions apart from motor and balance control it may exert via its cerebellar projections.

中文翻译：

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小鼠线性核的传入。

线性核（Li）于1978年从其投影到小脑而确定。然而，由于将逆行示踪剂注入该核的挑战，目前尚无系统研究其与中枢神经系统其他区域的联系。本研究检查了顺行示踪剂注射后其参与运动和心血管控制的某些核的传入。BDA注射到杏仁中央核中会导致同侧Li标记纤维。注射后观察到具有同侧优势的双侧投影：a）联合副指旁核，去甲肾上腺素能组7 /Köllike-融合核/蓝藻核，b）巨细胞网状核，c）和孤立核/小泡/中间核。BDA注射入所有这些核后，除了中央杏仁核和副睑旁核，在Li中观察到逆行标记的神经元。我们的结果表明，除了运动和平衡控制外，Li还可能通过其小脑投射发挥多种生理功能。