水平半規管系前庭脊髄路ニューロンの軸索投射様式 : 耳石器系との比較も含めて

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We studied the properties of horizontal semicircular canal (HC) nerve-activated vestibulospinal neurons, which include vestibulo-spinal (VS) and vestibulo-oculo-spinal (VOS) neurons. Axonal pathways, projection levels, and locations of HC nerveactivated vestibulospinal neurons were studied. The HC nerve was selectively stimulated. HC nerve-activated vestibulospinal neurons were mainly located in the ventral portion of the medial and lateral vestibular nuclei, and the middle portion of the descending nucleus. The majority of HC nerve-activated VS and VOS neurons sent descending axons through the medial vestibulospinal tract (MVST); the remaining neurons sent descending axons through the ipsilateral (i-) lateral vestibulospinal tract (LVST). Most neurons that had descending projections through the i-MVST were VS neurons, while most that had descending projections through the contralateral MVST were VOS neurons. All neurons with descending projections through the i-LVST were VS neurons. Almost all the HC nerve-activated vestibulospinal neurons were activated antidromically only from the cervical segment. No neurons were activated from the L3 segment. On the other hand, 14% of the utricular and 7% of the saccular nerve-activated vestibulospinal neurons were activated from the lumbar segment. The projection of HC nerveactivated vestibulospinal neurons to regions below the thoracic spinal cord appears to be minor, which is in marked contrast with the projection of otolith-activated neurons. It is likely that the majority of HC nerve-activated vestibulospinal neurons terminate in the cervical cord and have strong connections with neck motoneurons.
日本めまい平衡医学会の論文
2005-02-01

水平半規管系前庭脊髄路ニューロンの軸索投射様式 : 耳石器系との比較も含めて

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