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首页> 美国卫生研究院文献>Cells Tissues Organs >Functional Anatomy of Incisal Biting in Aplodontia rufa and Sciuromorph Rodents – Part 2: Sciuromorphy Is Efficacious for Production of Force at the Incisors
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Functional Anatomy of Incisal Biting in Aplodontia rufa and Sciuromorph Rodents – Part 2: Sciuromorphy Is Efficacious for Production of Force at the Incisors

机译：紫花苜蓿和Sciuromorph啮齿动物的切牙咬合功能解剖–第2部分：Sciuromorphy可有效在切牙处产生力

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The protrogomorph condition of the rodent masticatory apparatus is thought to be present in only one living species, the mountain beaver Aplodontia rufa. The major anatomical difference between protrogomorphs and sciuromorphs is that the relative size of one part of the masseter muscle, the anterior lateral masseter, is much greater in sciuromorphs than in protrogomorphs. The mechanics of force production at the incisors were compared in A. rufa and six sciuromorph rodents. Is the sciuroid masticatory apparatus more effective for production of forces at the incisors during biting than the primitive, protrogomorph condition? To answer this question, three measures of mechanical ability were employed and three hypotheses were tested: (1) the mechanical advantage of the adductor musculature is greater in sciuromorphs than in A. rufa; (2) the relative force produced at the incisors is greater in sciuromorphs than in A. rufa, and (3) the relative amount of force produced that can be used to drive the incisors into an object, is greater in sciuromorphs than in A. rufa. The results demonstrated that the protrogomorph, A. rufa, is not as efficient at generating bite forces at the incisors as the sciuromorphs.
机译：啮齿动物咀嚼器的变态状态被认为仅存在于一种活的物种中，即山海狸Aplodontia rufa。 protrogomorphs和sciuromorphs之间的主要解剖差异是，在sophuromorphs中，咬肌的一部分（前侧咬肌）的相对大小比protrogomorphs大得多。比较了在A. rufa和六只Sciuromorph啮齿动物中切牙的力产生机理。比起原始的protrogomorph病状，螺旋形咀嚼器对咬牙过程中的切牙产生力是否更有效？为了回答这个问题，采用了三种机械能力的度量标准，并测试了三个假设：（1）sciuromorphs的内收肌组织的机械优势比A. rufa大。 （2）在sciuromorph中，在门齿处产生的相对力要比在A. rufa中更大，并且（3）在sciuromorph中，可用于将门齿推入物体的相对力要比在A.中大。 rufa。结果表明，protrogomorph A. rufa不能像sciuromorph一样有效地在门齿处产生咬合力。

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