Macaque masseter muscle:: Internal architecture, fiber length and cross-sectional area
Macaque masseter muscle:: Internal architecture, fiber length and cross-sectional area
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DOI：
10.1023/a:1020509006259
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发表时间：
1999-06-01
影响因子：
2.5
通讯作者：
Antón, SC
中科院分区：
文献类型：
--
作者：
Antón, SC
咀嚼模型需要了解纤维长度和生理横截面积（PCS）：肌肉力量的代表。然而，只有少数不同种类、年龄和性别的猕猴符合先前的咬肌结构标准。我使用粗略和化学技术解剖了 3 种猕猴（束状猕猴、穆拉塔猕猴、nemestrina 猕猴）的 30 只成年雌性的 36 块咬肌，并计算了 PCS。这些猕猴具有相似的饮食结构，咬肌结构或纤维长度没有显着差异。肌内肌腱有效地将猕猴咬肌从内侧划分到外侧。纤维长度因肌肉分段而异，但在物种之间相对保守。纤维长度不随身体尺寸（质量）或咬肌质量变化。然而，PCS 与身体尺寸等轴测；较大的动物具有更强的力量生产能力。 PCS 与面部尺寸呈正异速缩放；具有更多前颌面和更高下颌体的动物具有更大的 PCS 值，因此力值也更大。这种正异速生长可以解决长脸动物咬肌定位效率较低的问题。在每种情况下，物种间 PCS 的差异都是由肌肉质量的差异造成的，而不是纤维长度的差异。咬肌 PCS 与之前用于估计肌力的骨代理的相关性很弱，因此肌力前骨参数的预测将带来较大的误差范围，应谨慎使用。
Models of mastication require knowledge of fiber lengths and physiological cross-sectional area (PCS): a proxy for muscle force. Yet only a small number of macaques of various species, ages, and sexes inform the previous standards for masseter muscle architecture. I dissected 36 masseters from 30 adult females of 3 macaque species-Macaca fascicularis, M. mulatta, M. nemestrina-using gross and chemical techniques and calculated PCS. These macaques have mechanically similar dietary niches and exhibit no significant difference in masseter architecture or fiber length. Intramuscular tendons effectively compartmentalize macaque masseters from medial to lateral. Fiber lengths vary by muscle subsection but are relatively conservative among species. Fiber length does not scale with body size (mass) or masseter muscle mass. However PCS scales isometrically with body size; larger animals have greater force production capabilities. PCS scales positively allometrically with facial size; animals with more prognathic faces and taller mandibular corpora have greater PCS, and hence force, values. This positive allometry counters the less efficient positioning of masseter muscles in longer-faced animals. In each case, differences in PCS among species result from differences in muscle mass not fiber length. Masseter PCS is only weakly correlated with bone proxies previously used to estimate muscle force, Thus predictions of muscle force front bone parameters will entail large margins of errors and should be used with caution.