Architectural design and fiber-type distribution of the major elbow flexors and extensors of the monkey (cynomolgus).
Architectural design and fiber-type distribution of the major elbow flexors and extensors of the monkey (cynomolgus).
复制标题
猴子（食蟹猴）主要肘屈肌和伸肌的结构设计和纤维类型分布。
DOI：
10.1002/aja.1001710305
复制
发表时间：
1984
期刊：
影响因子：
--
通讯作者：
Simpson,DR
中科院分区：
文献类型：
--
作者：
Roy,RR;Bello,MA;Powell,PL;Simpson,DR
由于骨骼肌的结构和生化特性决定了其力、速度和位移特性，因此研究了灵长类动物（食蟹猴、猴）手肘的主要伸肌（肱三头肌）和屈肌（肱二头肌、肱肌和肱桡肌）。根据肌肉质量、平均纤维长度（标准化为2.20 μm肌节长度）和每块肌肉的纤维羽状角测量值计算功能横截面积（CSA）。确定纤维类型分布，并将其用作肌肉生化能力的总指数。伸肌组的平均纤维长度较短（31与47 mm），CSA较大（13与8 cm 2），慢缩纤维的总体百分比较高（47与26%）。因此，手肘伸肌比屈肌有更大的力量产生和力量维持的潜力。相比之下，屈肌被设计为优化其长度-速度潜力;即，它们有相对较长的纤维和比伸肌更高的快缩纤维成分。在评价手肘关节运动控制机制时，应考虑拮抗肌群之间的这些形态学差异。
Because the architectural and biochemical properties of a skeletal muscle dictate its force, velocity, and displacement properties, the major extensors (triceps brachii) and flexors (biceps brachii, brachialis, and brachioradialis) of the elbow in a primate (cynomolgus, monkey) were studied. Functional cross‐sectional areas (CSA) were calculated from muscle mass, mean fiber length (normalized to a 2.20 μm sarcomere length), and angle of fiber pinnation measurements from each muscle. Fiber‐type distributions were determined and used as a gross index of the biochemical capacities of the muscle. The extensor group had a shorter mean fiber length (31 vs. 47 mm), a larger CSA (13 vs. 8 cm2), and a higher overall percentage of slow‐twitch fibers (47 vs. 26%). Consequently, the elbow extensors had a relatively greater potential for force production and force maintenance than the flexors. In contrast, the flexors were designed to optimize their length‐velocity potentials; i.e., they had relatively long fibers and a higher fast‐twitch fiber composition than the extensors. These morphologic differences between antagonistic muscle groups should be considered when evaluating the motor control mechanisms regulating reciprocal movements about the elbow.