Energy metabolism and muscle pathology in swallowing muscles after electric nerve stimulation

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Swallowing mechanism are very complicated and muscle pathology of the swallowing muscles has yet to be clarified. Histochemical characteristics of the human masticatory muscles and swallowing muscles were investigated in this study. Experimental studies of soft diet using young rabbits were also performed. Human masseter muscle and swallowing muscle showed unique histochemical characterstics reflecting highly differentiated masticatory and swallowing function. The soft diet experiment showed transformation of the muscle fiber types, suggesting that long-term soft diet leads to adaptations of the pterygoidmuscles. Two heads of the lateral pterygoid muscle revealed different adaptation from jaw-closing musclesunder soft-diet conditions.