Jaslow C R
University of Chicago, Department of Anatomy, IL 60637.
J Biomech. 1990;23(4):313-21. doi: 10.1016/0021-9290(90)90059-c.
Many bones in mammalian skulls are linked together by cranial sutures, connective tissue joints that are morphologically variable and show different levels of interdigitation among and within species. The goal of this investigation was to determine whether sections of skull with cranial sutures have different mechanical properties than adjacent sections without sutures, and if these properties are enhanced with increased interdigitation. To test these hypotheses, bending strength and impact energy absorption were measured for samples of goat (Capra hircus) cranial bone without sutures and with sutures of different degrees of interdigitation. Bending strength was measured under both dynamic (9.7 mm displacement s-1) and relatively static (0.8 mm s-1) conditions, and at either speed, increased sutural interdigitation provided increased strength during three-point bending. However, except for very highly interdigitated sutures loaded slowly, sutures were not as strong in bending as bone. In contrast, sutures absorbed from 16% to 100% more energy per unit volume during impact loading than did bone. This five-fold increase in energy absorption by the sutures was significantly correlated with increased sutural interdigitation.
哺乳动物颅骨中的许多骨头通过颅缝连接在一起，颅缝是结缔组织关节，其形态可变，在不同物种之间以及同一物种内部表现出不同程度的相互交错。本研究的目的是确定带有颅缝的颅骨部分与相邻的无颅缝部分是否具有不同的力学性能，以及这些性能是否会随着相互交错程度的增加而增强。为了验证这些假设，对山羊（Capra hircus）无颅缝和具有不同相互交错程度颅缝的颅骨样本进行了抗弯强度和冲击能量吸收测量。在动态（9.7毫米位移每秒）和相对静态（0.8毫米每秒）条件下测量抗弯强度，在这两种速度下，在三点弯曲过程中，颅缝相互交错程度的增加都会提高强度。然而，除了加载缓慢的高度相互交错的颅缝外，颅缝在抗弯方面不如骨头强。相比之下，在冲击载荷下，颅缝每单位体积吸收的能量比骨头多16%至100%。颅缝能量吸收增加五倍与颅缝相互交错程度的增加显著相关。
