Ström D, Holm S
Department of Prosthetic Dentistry, Faculty of Odontology, University of Göteborg, Sweden.
Arch Oral Biol. 1994 Apr;39(4):295-300. doi: 10.1016/0003-9969(94)90120-1.
The distribution of intrafascicular type I and II muscle fibres together with proportions of edge- and centrally located type I and II fibres within whole fascicles were analysed by myosin ATP-ase histochemistry in 241 porcine masseter fascicles (six masseter muscles) and compared with result from 63 pig soleus fascicles (five soleus muscles). All fascicles were from 11 domestic pigs (1 yr old, 70-90 kg body weight, all female). The proportions of type I fibres (slow) and type II fibres (fast) on the edge of fascicles differed significantly from the proportions centrally. All the soleus fascicles had higher proportions of centrally located type I fibres. Only seven out of 241 (3%) masseter fascicles diverged in this respect and showed reversed intrafascicular fibre-type proportions with more edge-located type I fibres. Analysis of the fascicular distribution of type I and II fibres revealed that the porcine masseter had type II fibres as the predominant type. Between 68-87% of the total fibres were type II (p < 0.001). The intrafascicular content of type I fibres increased towards the deep part of the masseter. In four of five soleus muscles the type II fibre population was dominant (p < 0.01). However, one soleus revealed equal proportions of type I and II fibres.
通过肌球蛋白ATP酶组织化学分析了241个猪咬肌束（六块咬肌）内束内I型和II型肌纤维的分布，以及整个肌束内边缘和中央定位的I型和II型纤维的比例，并与63个猪比目鱼肌束（五块比目鱼肌）的结果进行了比较。所有肌束均来自11头家猪（1岁，体重70 - 90千克，均为雌性）。肌束边缘的I型纤维（慢肌）和II型纤维（快肌）比例与中央的比例有显著差异。所有比目鱼肌束中央定位的I型纤维比例更高。在241个咬肌束中，只有7个（3%）在这方面有所不同，其束内纤维类型比例相反，边缘定位的I型纤维更多。对I型和II型纤维的束状分布分析表明，猪咬肌以II型纤维为主。总纤维的68 - 87%为II型纤维（p < 0.001）。I型纤维的束内含量向咬肌深部增加。在五块比目鱼肌中，有四块II型纤维占主导（p < 0.01）。然而，一块比目鱼肌I型和II型纤维比例相等。
