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Quantification of neurons in the olfactory bulb of the catsharks Scyliorhinus canicula (Linnaeus, 1758) and Galeus melastomus (Rafinesque, 1810)
Zoology ( IF 2 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.zool.2020.125796
Stefano Aicardi 1 , Andrea Amaroli 2 , Lorenzo Gallus 1 , Davide Di Blasi 3 , Laura Ghigliotti 3 , Federico Betti 1 , Marino Vacchi 3 , Sara Ferrando 1
Affiliation  

In vertebrates, the olfactory bulb (OB) is the zone of the brain devoted to receiving the olfactory stimuli. The size of the OB relative to the size of the brain has been positively correlated to a good olfactory capability but, recently, this correlation was questioned after new investigation techniques were developed. Among them, the isotropic fractionator allows to estimate the number of neurons and non-neurons in a given portion of nervous tissue. To date, this technique has been applied in a number of species; in particular the OB was separately analyzed in numerous mammals and in a single crocodile species. Thus, a quantitative description of the OB's cells is available for a small portion of vertebrates. Main aim of this work was to apply isotropic fractionator to investigate the olfactory capability of elasmobranch fishes, whose traditional concept of outstanding olfaction has recently been scaled down by anatomical and physiological studies. For this purpose, the OB of two elasmobranch species, Galeus melastomus and Scyliorhinus canicula, was studied leading to the determination of the number of neurons vs non-neurons in the OB of the specimens. In addition, the obtained cell quantification was related to the olfactory epithelium surface area to obtain a new parameter that encapsulates both information on the peripheral olfactory organ and the OB. The analyzed species resulted in an overall similar quantitative organization of the peripheral olfactory system; slight differences were detected possibly reflecting different environment preference and feeding strategy. Moreover, the non-neurons/neurons ratio of these species, compared to those available in the literature, seems to place elasmobranch fishes among the vertebrate species in which olfaction plays an important role.

中文翻译:

猫鲨 Scyliorhinus canicula (Linnaeus, 1758) 和 Galeus melastomus (Rafinesque, 1810) 嗅球中神经元的量化

在脊椎动物中,嗅球 (OB) 是大脑中专门用于接收嗅觉刺激的区域。OB 的大小相对于大脑的大小与良好的嗅觉能力呈正相关,但最近,在开发新的调查技术后,这种相关性受到质疑。其中,各向同性分馏器允许估计神经组织给定部分中神经元和非神经元的数量。迄今为止,该技术已应用于许多物种;特别是在许多哺乳动物和单一鳄鱼物种中分别分析了 OB。因此,OB 细胞的定量描述可用于一小部分脊椎动物。这项工作的主要目的是应用各向同性分馏器来研究硬鳃鱼类的嗅觉能力,其杰出嗅觉的传统概念最近已被解剖学和生理学研究缩小。为此,研究了两种 elausmobranch 物种 Galeus melastomus 和 Scyliorhinus canicula 的 OB,从而确定了标本 OB 中神经元与非神经元的数量。此外,获得的细胞量化与嗅觉上皮表面积有关,以获得一个新参数,该参数封装了外周嗅觉器官和 OB 的信息。分析的物种导致外周嗅觉系统的整体相似的定量组织;检测到的细微差异可能反映了不同的环境偏好和饲养策略。此外,这些物种的非神经元/神经元比率,
更新日期:2020-08-01
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