Bowman J P
J Speech Hear Res. 1982 Sep;25(3):357-63.
The extent to which the known trigeminothalamic projections are related to afferents from specific peripheral branches of the trigeminal nerve is not clearly revealed by degeneration studies involving lesions of the various trigeminal nuclei. This study examines the ascending projections related to the lingual branch of the trigeminal nerve using the evoked-potential technique in pentobarbital anesthetized rhesus monkeys. The distribution of potentials within the medulla, pons, and midbrain was determined by recording with macroelectrodes following single-pulse stimulation of the lingual nerve. Results show that two pathways from the main sensory nucleus convey lingual nerve information to the thalamic ventral posteromedial nucleus: an ipsilateral projection which in position corresponds to the dorsal trigeminal tract, and a larger contralateral projection which in position corresponds to the to the crossed ventral trigeminal tract, or trigeminal lemniscus. Additionally, the spinal trigeminal nucleus contributes fibers of lingual nerve origin to the contralateral medial lemniscus. The role of low-threshold mechanoreceptive information in lingual sensorimotor activity is discussed in relation to current concepts of somatosensory system function.
涉及三叉神经各核损伤的变性研究，并未清楚揭示已知的三叉丘脑投射与三叉神经特定外周分支传入纤维之间的关联程度。本研究采用诱发电位技术，在戊巴比妥麻醉的恒河猴中，研究与三叉神经舌支相关的上行投射。通过在舌神经单脉冲刺激后用宏观电极记录，确定了延髓、脑桥和中脑内电位的分布。结果表明，来自主感觉核的两条通路将舌神经信息传递至丘脑腹后内侧核：一条同侧投射，其位置与背侧三叉神经束相对应；一条较大的对侧投射，其位置与交叉的腹侧三叉神经束或三叉丘系相对应。此外，三叉神经脊束核将舌神经起源的纤维贡献给对侧内侧丘系。结合当前躯体感觉系统功能的概念，讨论了低阈值机械感受信息在舌部感觉运动活动中的作用。
