Wang Hao, Wang Wenbo, Song Yi, Cai Lei, Dai Zhendong
College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Appl Bionics Biomech. 2018 Feb 19;2018:9857894. doi: 10.1155/2018/9857894. eCollection 2018.
are capable to crawl on the steep even on upside-down surfaces. Such movement, especially at great altitude, puts them at high risks of incidentally dropping down and inevitable body or head impactions, though they may trigger air-righting reaction (ARR) to attenuate the landing shocks. However, the air-righting ability (ARA) in is not fully developed. The implementation of ARR in some geckos is quite slow; and for those without tails, the ARR is even unobservable. Since ARA is compromised in , there must be some other mechanisms responsible for protecting them from head injuries during falls. In this study, we looked into a 's brain to study its internal environment and structure, using the magnetic resonance imaging (MRI) technique. The results showed that the brain parenchyma was fully surrounded by the cerebrospinal fluid (CSF) in the skull. A succulent characteristic was presented, which meant the intracalvarium was significantly occupied by the CSF, up to 45% in volume. Then a simplified three-dimensional finite element model was built, and a dynamic simulation was conducted to evaluate the mechanical property of this succulent characteristic during the head impactions. These implied the succulent characteristic may play certain roles on the self-protection in case of head impaction, which is adaptable to the 's locomotion and behavior.
能够在陡峭的甚至倒置的表面上爬行。这样的移动，尤其是在高海拔地区，使它们面临意外掉落以及不可避免的身体或头部撞击的高风险，尽管它们可能会触发空中翻身反应（ARR）以减轻着陆冲击。然而，[某种动物]的空中翻身能力（ARA）并未完全发育。一些壁虎的ARR实施相当缓慢；而对于那些没有尾巴的壁虎，ARR甚至难以观察到。由于ARA在[某种动物]中受损，必然存在其他一些机制来保护它们在坠落时免受头部伤害。在本研究中，我们使用磁共振成像（MRI）技术研究了[某种动物]的大脑，以探究其内部环境和结构。结果表明，脑实质在颅骨内被脑脊液（CSF）完全包围。呈现出一种饱满的特征，这意味着颅内显著被CSF占据，体积高达45%。然后建立了一个简化的三维有限元模型，并进行了动态模拟以评估头部撞击时这种饱满特征的力学性能。这些表明这种饱满特征在头部撞击情况下的自我保护中可能发挥一定作用，这与[某种动物]的运动和行为相适应。
