Narrowing, twisting, and undulating: Complicated movement in shark spiral intestine inferred using ultrasound
Narrowing, twisting, and undulating: Complicated movement in shark spiral intestine inferred using ultrasound
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狭窄、扭曲和起伏：利用超声波推断鲨鱼螺旋肠的复杂运动
DOI：
10.1016/j.zool.2023.126077
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发表时间：
2023
期刊：
影响因子：
2
通讯作者：
Matsumoto Rui
中科院分区：
文献类型：
--
作者：
Tomita Taketeru;Murakumo Kiyomi;Matsumoto Rui
鲨鱼肠呈现复杂的三维形态，其特征在于具有卷曲的内部隔膜。关于肠道的一个基本问题是它的运动。这种知识的缺乏阻碍了对其功能形态学假设的检验。目前的研究，据我们所知，第一次，可视化的肠道运动的三个圈养鲨鱼使用“水下超声”系统。结果表明，鲨鱼肠的运动包括强烈的扭转。我们怀疑，这种运动是收紧内隔膜卷曲的机制，增强了肠腔的压缩。我们的数据还揭示了存在的积极波动运动的内部隔膜，其中波动波传播的相反方向（肛门口）。我们假设，这种运动降低了流速的腹杆和增加吸收时间。这些观察结果表明，鲨鱼螺旋肠的运动学比基于形态学的预期更复杂，并且肠中的流体流动可能受到肠肌肉活动的高度调节。
Shark intestine presents a complicated three-dimensional morphology, characterized by the development of a coiled internal septum. A basic question regarding the intestine is its movement. This lack of knowledge has prevented the testing of the hypothesis on its functional morphology. The present study, to our knowledge, for the first time, visualized the intestinal movement of three captive sharks using an “underwater ultrasound” system. The results indicated that the movement of the shark intestine involved strong twisting. We suspect that this motion is the mechanism that tightens the coiling of the internal septum, enhancing compression of the intestinal lumen. Our data also revealed the presence of active undulatory movement of the internal septum, of which the undulatory wave propagated in the opposite (anal-to-oral) direction. We hypothesize that this motion decreases the flow rate of the digesta and increases absorptive time. These observations indicate that the kinematics of the shark spiral intestine are more complicated than expected based on morphology, and the fluid flow in the intestine is likely highly regulated by intestinal muscular activity.