Sato I, Suzuki M, Sato M, Sato T, Inokuchi S
Department of Anatomy, School of Dentistry, Tokyo.
Okajimas Folia Anat Jpn. 1990 Mar;66(6):405-15. doi: 10.2535/ofaj1936.66.6_405.
Twelve male 9-week-old Wistar rats were used in this study. Intrinsic (transverse, longitudinal and vertical) and extrinsic (genioglossus) muscles of the tongue were examined using histochemical methods. Intrinsic muscle consists mainly of intermediate and red fiber types; in contrast, there is an increase in the white fiber type in extrinsic muscle. The predominant fiber types, red and intermediate, in the intrinsic muscle are smaller than those of the extrinsic muscle. Among the intrinsic muscles, the longitudinal muscle fibers show a tendency to be smaller in size than the others. The continuous movement of the intrinsic muscle fibers influences the shape of the tongue and contributes to versatile activity in chewing. In contrast, extrinsic muscle of the rat tongue reflects powerful movements in mastication, swallowing and squeaking owing to the increased percentage composition of the white fiber type.
本研究使用了12只9周龄的雄性Wistar大鼠。采用组织化学方法检查了舌的固有肌（横肌、纵肌和垂直肌）和外在肌（颏舌肌）。固有肌主要由中间型和红色纤维类型组成；相比之下，外在肌中白色纤维类型增加。固有肌中占主导的红色和中间型纤维比外在肌中的纤维小。在固有肌中，纵肌纤维的尺寸往往比其他肌纤维小。固有肌纤维的持续运动影响舌的形状，并有助于咀嚼中的多种活动。相比之下，大鼠舌的外在肌由于白色纤维类型的组成百分比增加，反映了咀嚼、吞咽和尖叫中的有力运动。
