新咬筋学説

概要

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Based upon the studies of more than 50 species of 13 orders out of 16 orders of existing mammalia, the author divided the masseter into the proper masseter, which includes the pars superficialis and pars profunda, and the improper masseter, which includes the maxillomandibularis and the zygomaticomandibularis. The pars superficialis is subdivided into the masseter superficialis, lamina prima, the masseter superficialis, lamina secunda and the masseter intermedius. The pars profunda is subdivided into the pars anterior and pars posterior, which can be further developed into several laminae. These are arranged under the reversal relation of the tendon and muscular substance. The maxillomandibularis is well developed especially in the rodentia and ungulate, while the zygomaticomandibularis makes a special development in the higher primate, including the man; namely, it is differentiated into the orbital type, which includes the lamina prima and lamina secunda. This lamina secunda, which attaches the orbital margin, seems to play an important role to the development of the supraorbital eminence or arch. Further the presence of superficial temporalis could be ascertained in the human temporalis. The author established the reasonable masseter theory, improving the incomplete points of the Toldt's masseter theory (1905). He is the orthodox successor of the latter theory, establishing the more complete laminar theory of the masseter.
千葉大学の論文