Baeza-Loya Selina, Raible David W
Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-HNS and Biological Structure, University of Washington, Seattle, WA, United States.
Front Cell Dev Biol. 2023 Apr 18;11:1172933. doi: 10.3389/fcell.2023.1172933. eCollection 2023.
The vestibular system of the inner ear provides information about head motion and spatial orientation relative to gravity to ensure gaze stability, balance, and postural control. Zebrafish, like humans, have five sensory patches per ear that serve as peripheral vestibular organs, with the addition of the lagena and macula neglecta. The zebrafish inner ear can be easily studied due to its accessible location, the transparent tissue of larval fish, and the early development of vestibular behaviors. Thus, zebrafish are an excellent model for studying the development, physiology, and function of the vestibular system. Recent work has made great strides to elucidate vestibular neural circuitry in fish, tracing sensory transmission from receptors in the periphery to central computational circuits driving vestibular reflexes. Here we highlight recent work that illuminates the functional organization of vestibular sensory epithelia, innervating first-order afferent neurons, and second-order neuronal targets in the hindbrain. Using a combination of genetic, anatomical, electrophysiological, and optical techniques, these studies have probed the roles of vestibular sensory signals in fish gaze, postural, and swimming behaviors. We discuss remaining questions in vestibular development and organization that are tractable in the zebrafish model.
内耳的前庭系统提供有关头部运动以及相对于重力的空间定向的信息,以确保注视稳定、平衡和姿势控制。斑马鱼与人类一样,每只耳朵有五个感觉斑,作为外周前庭器官,此外还有瓶状囊和忽略斑。由于其位置易于接近、幼鱼组织透明以及前庭行为发育较早,斑马鱼的内耳很容易进行研究。因此,斑马鱼是研究前庭系统发育、生理学和功能的优秀模型。最近的研究在阐明鱼类前庭神经回路方面取得了很大进展,追踪了从外周感受器到驱动前庭反射的中枢计算回路的感觉传递。在这里,我们重点介绍了最近的一些研究工作,这些工作阐明了前庭感觉上皮的功能组织、支配一级传入神经元以及后脑的二级神经元靶点。通过结合遗传、解剖、电生理和光学技术,这些研究探讨了前庭感觉信号在鱼类注视、姿势和游泳行为中的作用。我们讨论了在前庭发育和组织方面仍存在的、在斑马鱼模型中易于解决的问题。
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