顎・舌運動制御にかかわる咀嚼筋および舌筋固有受容感覚ニューロンの中枢分布
第I報、咀嚼筋固有受容感覚ニューロンの分布
1987 年 54 巻 2 号 p. 365-386
詳細
1987 年 54 巻 2 号 p. 365-386
The central projection of the trigeminal mesencephalic tract neurons innervating the jawclosing muscle spindles was investigated on the mouse by injecting horseradish peroxidase (HRP) into the masseteric nerve.
The HRP-labeled cells were ipsilaterally identified throughout the rostrocaudal extent of the trigeminal mesencephalic tract nucleus.
The central processes of the mesencephalic tract neurons terminated ipsilaterally into the nuclei as follows: the trigeminal motor nucleus, trigeminal main sensory nucleus, supratrigeminal nucleus, trigeminal spinal tract nucleus, lateral parts of pontine and medullary reticular formations, vagal dorsal motor nucleus, hypoglossal nucleus and lamina V of the C1-C2 segments of the spinal cord. But, they were not identified in the facial nucleus, solitary nucleus and cerebellum.
The localization of the trigeminal mesencephalic tract neurons innervating the jaw-closing muscle spindles was investigated by injecting fluorescent compounds as retrograde tracers into the jaw-closing muscles: masseter, temporal and medial pterygoid muscles. Fluorescent-labeled cells were found intermingled throughout the whole nucleus rostrocaudally. Double or triple fluorescent-labeled cells were not identified in the nucleus.
It is suggested that there is no axonal branching from the muscle spindle afferent outside the jaw-closing muscle bellies.
