Microscopic structure of the olfactory organ of the clearnose skate, Raja eglanteria.
Microscopic structure of the olfactory organ of the clearnose skate, Raja eglanteria.
复制标题
透明鼻鳐（Raja elanteria）嗅觉器官的微观结构。
DOI：
10.1007/bf00234300
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Graziadei,PP
中科院分区：
文献类型：
--
作者：
Takami,S;Luer,CA;Graziadei,PP
用光学显微镜和电子显微镜观察了黑腹罗非鱼幼鱼的嗅觉器官。该器官为卵圆形，其自由面因约20个片层的存在而变得复杂。每个板层都有一个折叠的表面，内衬着典型的神经感觉嗅觉上皮。双极嗅觉感受器神经元、纤毛支持细胞和基底细胞是上皮的主要细胞成分。两种类型的感受器神经元都有微绒毛，但没有纤毛。1型神经元与之前在其他鱼类中描述的神经元相似。2型神经元具有独特的形态特征，可以单独进行描述。其树状突起较大，微绒毛短而粗，排列整齐。紧密的细丝束为每个微绒毛提供骨架，这些细丝束向下延伸到树突中超过5μm。2型受体神经元高尔基复合体发达，粗面内质网稀疏，而1型受体神经元高尔基复合体发育较差，粗面内质网系统明显。上皮表面的粘液层是由杯状细胞的分泌提供的，杯状细胞主要位于每一层的外围区域。固有层的支持细胞和腺体内未见分泌颗粒。
The olfactory organ of juvenile clearnose skates (Raja eglanteria) was studied with the light and electron microscopes. The organ is ovoid in shape, and its free surface is complicated by the presence of some 20 lamellae. Each lamella has a folded surface lined by a typical neurosensory olfactory epithelium. Bipolar olfactory receptor neurons, ciliated sustentacular cells, and basal cells are the pre-eminent cellular components of the epithelium. Two types of receptor neurons, both bearing microvilli but not cilia, were identified. The type 1 neuron is similar to that previously described in other fishes. The type 2 neuron has a characteristic morphology justifying a separate description. Its dendritic knob is larger than that of type 1, and its microvilli, which are shorter and thicker, are straight and regularly arranged. Tight bundles of filaments provide a skeleton to each microvillus, and these filament bundles reach more than 5 μm down into the dendrite. Type 2 receptor neurons have a well-developed Golgi complex and sparse rough endoplasmic reticulum (rER), whereas type 1 receptor neurons have a less well-developed Golgi complex and a conspicuous sytem of rER lamellae. The mucous layer on the epithelial surface is provided by the secretion of goblet cells that are situated mostly in the peripheral regions of each lamella. Secretory granules in the sustentacular cells and glands in the lamina propria were not observed.