Influence of structure on the tissue dynamics of the human soleus muscle observed in MRI studies during isometric contractions

被引:81
作者
Hodgson, JA
Finni, T
Lai, AM
Edgerton, VR
Sinha, S
机构
[1] Univ Calif Los Angeles, Dept Physiol Sci, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Brain Res Inst, Los Angeles, CA 90095 USA
[3] Univ Jyvaskyla, Dept Biol Phys Activ, Jyvaskyla 40014, Finland
[4] Univ Calif Los Angeles, Dept Radiol Sci, Los Angeles, CA 90095 USA
关键词
MRI; Visible Human Dataset; muscle architecture; voluntary contraction;
D O I
10.1002/jmor.10421
中图分类号
R602 [外科病理学、解剖学]; R32 [人体形态学];
学科分类号
100101 [人体解剖与组织胚胎学];
摘要
This article investigates how the internal structure of muscle and its relationship with tendon and even skeletal structures influence the translation of muscle fiber contractions into movement of a limb. Reconstructions of the anatomy of the human soleus muscle from the Visible Human Dataset (available from the National Library of Medicine), magnetic resonance images (MRI), and cadaver studies revealed a complex 3D connective tissue structure populated with pennate muscle fibers. The posterior aponeurosis and the median septum of the soleus form the insertion of the muscle and are continuous with the Achilles tendon. The distal extremities of the pennate muscle fibers attach to these structures. The anterior aponeurosis is located intramuscularly, between the posterior aponeurosis and the median septum. It forms the origin of the muscle and contacts the proximal extremities of the soleus muscle fibers. MRI measurements of in vivo tissue velocities during isometric contractions (20% and 40% maximum voluntary contractions) revealed a similarly complex 3D distribution of tissue movements. The distribution of velocities was similar to the distribution of major connective tissue structures within the muscle. During an isometric contraction, muscle fiber contractions move the median septum and posterior aponeurosis proximally, relative to the anterior aponeurosis. The permate arrangement of muscle fibers probably amplifies muscle fiber length changes but not sufficiently to account for the twofold difference in muscle fiber length changes relative to excursion of the calcaneus. The discrepancy may be accounted for by an additional gain mechanism operating directly on the Achilles tendon by constraining the posterior movement of the tendon, which would otherwise occur due to the increasingly posterior location of the calcaneus in plantarflexeion. J. Morphol. 267:584-601, 2006. (c) 2006 Wiley-Liss, Inc.
引用
收藏
页码:584 / 601
页数:18
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