• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Annals of anatomy =: Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft >Can skull form predict the shape of the temporomandibular joint? A study using geometric morphometrics on the skulls of wolves and domestic dogs
【24h】

Can skull form predict the shape of the temporomandibular joint? A study using geometric morphometrics on the skulls of wolves and domestic dogs

机译：骷髅形式可以预测颞下颌关节的形状吗？ 在狼和家养犬的头骨上使用几何形态识别性研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Abstract The temporomandibular joint (TMJ) conducts and restrains masticatory movements between the mammalian cranium and the mandible. Through this functional integration, TMJ morphology in wild mammals is strongly correlated with diet, resulting in a wide range of TMJ variations. However, in artificially selected and closely related domestic dogs, dietary specialisations between breeds can be ruled out as a diversifying factor although they display an enormous variation in TMJ morphology. This raises the question of the origin of this variation. Here we hypothesise that, even in the face of reduced functional demands, TMJ shape in dogs can be predicted by skull form; i.e. that the TMJ is still highly integrated in the dog skull. If true, TMJ variation in the dog would be a plain by-product of the enormous cranial variation in dogs and its genetic causes. We addressed this hypothesis using geometric morphometry on a data set of 214 dog and 60 wolf skulls. We digitized 53 three-dimensional landmarks of the skull and the TMJ on CT-based segmentations and compared (1) the variation between domestic dog and wolf TMJs (via principal component analysis) and (2) the pattern of covariation of skull size, flexion and rostrum length with TMJ shape (via regression of centroid size on shape and partial least squares analyses). We show that the TMJ in domestic dogs is significantly more diverse than in wolves: its shape covaries significantly with skull size, flexion and rostrum proportions in patterns which resemble those observed in primates. Similar patterns in canids, which are carnivorous, and primates, which are mostly frugivorous imply the existence of basic TMJ integration patterns which are independent of dietary adaptations. However, only limited amounts of TMJ variation in dogs can be explained by simple covariation with overall skull geometry. This implies that the final TMJ shape is gained partially independently of the rest of the skull. ]]>
机译：摘要颞下颌关节（TMJ）进行并限制哺乳动物颅骨和下颌骨之间的咀嚼运动。通过这种功能集成，野生哺乳动物中的TMJ形态与饮食强烈相关，导致各种TMJ变化。然而，在人工选择和密切相关的家养犬中，品种之间的膳食专业可以作为多样化因子排除，尽管它们在TMJ形态显示出巨大变化。这提出了这种变异的原因的问题。在这里，我们假设，即使在对功能需求降低的情况下，狗的TMJ形状也可以通过颅骨形式预测;即TMJ仍然在狗头骨中高度集成。如果是真，狗的TMJ变化将是狗的巨大颅骨变异的普通产物及其遗传原因。我们在214只狗和60狼头骨上的数据集上使用几何形态学来解决了这一假设。我们将颅骨的53个三维地标数字化，基于CT的分割，并比较（1）国内狗和狼TMJS（通过主成分分析）和（2）颅骨尺寸的调节模式，屈曲和轴长的长度与tmj形状（通过成形和部分最小二乘分析的质心尺寸的回归）。我们表明，国内狗的TMJ比狼群更多样化：其具有显着的颅骨尺寸，屈曲和主持比例的形状的变性，其在灵长类动物中观察到的模式。 CANID中的类似模式，其是肉食，以及最重要的是FRUGIVIVORY的含量意味着存在与膳食适应无关的基本TMJ集成模式。然而，只有与总头骨几何形状的简单协变度，狗的只有有限的TMJ变化可以解释。这意味着最终的TMJ形状的部分地从颅骨的其余部分部分地获得。 ]]>

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号