Rokx J T, van Willigen J D, Jansen H W
Arch Oral Biol. 1984;29(1):25-31. doi: 10.1016/0003-9969(84)90038-4.
The fibre composition and occurrence of muscle spindles was studied in the masticatory, the suprahyoid and the infrahyoid muscles of the rat. Muscle fibres were typed as fast-white, fast-intermediate, fast-red and slow-red according to their ATPase and SDH activity. Fibre type appeared to be closely related to fibre diameter. In most of the muscles, all four fibre types were found. Slow-red fibres were absent in the superficial masseter, the transverse mandibular and the omohyoid muscles; fast-white fibres were absent in the mylohyoid muscle. The masticatory muscles were mainly composed of the three fast-fibre types; the jaw-opener muscles (the anterior digastric, the posterior digastric, the posterior digastric, the stylohyoid and the lateral pterygoid muscle) showed more slow-red fibres. In the masticatory and most of the suprahyoid muscles, the slow-red fibres were restricted to an area with high SDH activity. In the infrahyoid muscles, the fibre types were evenly distributed. Many muscle spindles, often clustered, were found in the masticatory muscles, except in the lateral pterygoid. In most of the suprahyoid muscles, these sensory structures were absent. In the infrahyoid muscles, solitary muscle spindles were found.
对大鼠咀嚼肌、舌骨上肌群和舌骨下肌群的肌梭纤维组成及分布情况进行了研究。根据肌纤维的ATP酶和琥珀酸脱氢酶活性，将肌纤维分为快白肌纤维、快中间肌纤维、快红肌纤维和慢红肌纤维。纤维类型似乎与纤维直径密切相关。在大多数肌肉中，四种纤维类型均有发现。咬肌浅层、下颌横肌和肩胛舌骨肌中无慢红肌纤维；下颌舌骨肌中无快白肌纤维。咀嚼肌主要由三种快肌纤维类型组成；开颌肌（二腹肌前腹、二腹肌后腹、茎突舌骨肌和翼外肌）中慢红肌纤维较多。在咀嚼肌和大多数舌骨上肌群中，慢红肌纤维局限于琥珀酸脱氢酶活性较高的区域。在舌骨下肌群中，纤维类型分布均匀。除翼外肌外，咀嚼肌中发现许多肌梭，常成簇分布。在大多数舌骨上肌群中，没有这些感觉结构。在舌骨下肌群中，发现有单个肌梭。
