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RISS 인기검색어
- 검색키워드
- 저자 : 박 상억 (검색결과 1 건)
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백서에 있어서 저작운동의 발달에 따른 깨물근지배 운동신경원에 연접하는 억제성 종말의 연접양식의 변화
Synaptic connectivity of the masticatory motoneurons innervating jaw muscles during development has been studied little. This study was aimed to clarify central mechanism for jaw movement during postnatal development and investigated the development of synaptic organization of motoneurons innervating masticatory muscles. Masticatory motoneurons of 1 day-, 10 days- and 30 days-old rats were labeled by injection of horseradish peroxidase into the masticatory muscles. Brain stem was removed and processed for electron microscopy. Postembedding immunogold labeling was performed with antibodies against inhibitory and excitatory neurotransmitters. A total of 206, 350 and 497 boutons apposing on each 8 somata of masseteric motoneurons in groups of 1 day-, 10 days- and 30 days-old rats were analyzed. Mean length of boutons significantly increased during postnatal development. Percentage of synaptic covering also significantly increased during postnatal development. There was no significant difference in packing density among the three age groups. Boutons IR to GABA or glycine usually contained mixture of flattened, oval and round vesicles whereas, boutons IR to glutamate usually contained spherical synaptic vesicles. In case, where synaptic structure could be clearly observed, GABA and/or glycine IR boutons frequently showed symmetrical type of synaptic contact with postsynaptic membrane. In 1 day and 10 days groups of sucking phase there was no significant difference in proportion of bouton profiles among GABA IR, glycine IR, and both GABA and glycine IR boutons. Whereas in 30 days group of masticatory phase, proportion of GABA IR bouton was decreased, but that of glycine IR bouton increased significantly. Synaptic covering percentage increased in GABA IR bouton of 10 days group and glycine IR boutons of 30 days group. There was no change in proportion of inhibitory and excitatory boutons with development. These results show morphological evidence of rearrangement of inhibitory synaptic input to the jaw closing motoneurons during development of jaw movement.
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