FUNCTION AND FUSION AT MANDIBULAR SYMPHYSIS
FUNCTION AND FUSION AT MANDIBULAR SYMPHYSIS
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DOI：
10.1002/ajpa.1330470213
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发表时间：
1977-01-01
影响因子：
2.8
通讯作者：
BEECHER, RM
中科院分区：
文献类型：
--
作者：
BEECHER, RM
融合下颌骨联合的功能意义，所有的Anthropoidea的特点，被确定。这种特征可以追溯到亚目的起源。对11种原猴的组织学研究确定了联合的解剖结构。利用荧光电影技术研究了厚尾乳羚咀嚼运动的特点。纤维软骨和韧带的类似模式的特点所有原猴亚目研究。这些组织的排列是为了抵抗G.粗尾动物，即，联合下缘的前后剪切和扩展以及由平衡侧肌肉向咬合点的力转移引起的假设背腹剪切。在食叶性狐猴（Lemur fulvus）、黄狐猴（L. macaco、Propithecus verreauxi和Hapalemur griseus。只有那些与抵抗咬合力或背腹方向力相关的组织才发生钙化或骨化。这项工作表明，在上述物种中，吃叶所需的咬合力的增加导致了不同程度的联合融合的进化。有人认为，原齿龙也吃坚韧的食物，需要相对较大的咬合力。
The functional significance of a fused mandibular symphysis, characteristic of all Anthropoidea, was determined. The trait may date to the origins of the suborder. A histological study of 11 prosimian species determined the anatomy of the symphysis. A cinefluorographic film of Galago crassicaudatus mastication was studied to identify movements at the symphysis. A similar pattern of fibrocartilage and ligaments characterized all prosimians studied. These tissues are arranged to resist movements seen during mastication in G. crassicaudatus, i.e., antero-posterior shear and spreading of the inferior borders of the symphysis and hypothesized dorso-ventral shear resulting from the transfer of force from the balancing side muscles to the bite point. Partial fusion of the symphysis was found in the folivorous species Lemur fulvus, L. macaco, Propithecus verreauxi and Hapalemur griseus. Only those tissues associated with resisting occlusally or dorso-ventrally directed forces were calcifying or ossifying. This work suggested that the added occlusal force necessary for leaf-eating resulted in the evolution of varying degrees of symphyseal fusion in the above species. It was suggested that the protoanthropoids also ate tough foods that required relatively large bite forces.