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您请求的操作仅限于组中的用户:==骨骼肌解剖== ===大体===[[文件:muscle_structure_jpg |右|无框架]]在大多数肌肉中，纤维定向在同一方向，从原点到插入点呈直线运行。在肌肉中，力比长度变化更重要，例如股直肌。这些被称为羽状肌，具有相对于动作线有一定角度的单个纤维。因为收缩的纤维以一定角度拉动肌肉的整体动作，长度的变化较小，但同样的方向允许更多的纤维(从而更大的力)在给定尺寸的肌肉中。骨骼肌被一层坚硬的结缔组织包裹着，叫做肌外膜。膈肌包含许多肌束。包围每一个肌束的是一层肌膜，它包含许多肌纤维，包围每一个肌纤维的是一层结缔组织，称为肌内膜。肌外膜将肌肉组织固定在两端的肌腱上，在那里肌外膜变厚并形成胶原。它还可以保护肌肉免受其他肌肉和骨骼的摩擦。维基百科[https://en.wikipedia.org/wiki/Muscle#Gross_anatomy肌肉]可从:https://en.wikipedia.org/wiki/Muscle#Gross_anatomy(上次访问于2019年6月4日)结缔组织以筋膜的形式存在于所有肌肉中。 The below video gives a good brief illustration of this {{#ev:youtube|https://www.youtube.com/watch?v=SCznFaTwTPE&feature=youtu.be|width}}Teach PE Structure of Skeletal Muscle Explained in simple terms Available from: https://www.youtube.com/watch?v=SCznFaTwTPE&feature=youtu.be (last accessed 5.6.2019) === Micro === [[File:Sarcolema SkeletalMuscle.png|right|frameless]] The sarcolemma is the cell membrane of a striated muscle cell. It forms a physical barrier against the external environment and also mediates signals between the exterior and the muscle cell. The sarcoplasm is the specialized cytoplasm of a muscle cell that contains the usual subcellular elements along with the Golgi apparatus, abundant myofibrils, a modified endoplasmic reticulum known as the sarcoplasmic reticulum (SR), myoglobin and mitochondria. Transverse (T)-tubules invaginate the sarcolemma and form a network around the myofibrils, storing and providing the Ca2+ that is required for muscle contraction. Myofibrils are contractile units (within the muscle cell) that consist of an ordered arrangement of longitudinal myofilaments (thin actin filaments and thick myosin filaments). The characteristic 'striations' of skeletal and cardiac muscle readily observable by light microscopy are the thin filaments (light) the thick filaments (dark). The Z-line defines the lateral boundary of each sarcomere. Contraction of the sarcomere occurs when the Z-lines move closer together, making the myofibrils contract, and therefore the whole muscle cell and then the entire muscle contracts. The interaction of myosin and actin is responsible for muscle contraction.BIO 301 Human Physiology [http://people.eku.edu/ritchisong/301notes3.htm Muscle] Available from: http://people.eku.edu/ritchisong/301notes3.htm (last accessed 5.6.2019) 回到 检索自"//m.houseofhawgs.com/Muscle＂
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