魚類嗅上皮の比較形態学的研究-IV : ウナギ目・ハダカイワシ目

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The peripheral olfactory organs of Anguilla japonica, Conger myriaster, Microdonophis erabo, Gymnothorax kikado (Anguilliformes) and Trachinocephalus myops (Myctophiformes) were examined by scanning electron microscopy. In four species of the Anguilliformes, the olfactory rosette is very elongate in shape and consists of a large number (100--130) of lamellae. Almost whole surface of the lamellae is covered uniformly with dense cilia which arise mostly from type 1 ciliated cells (cells giving off many long cilia from the flat and wide surface). The type 2 ciliated cells (cells protruding a hillock-like cell apex from which several cilia project radially) and the microvillous cells (cells bearing many microvilli in a tuft) are present under the dense cilia. The rod cells (cells protruding a simple rod) occur singly or in groups. In Trachinocephalus myops, the peripheral olfactory organ consists of 8-10 lamellae which are arranged in the shape of a fan. On each face of the lamellae, a broad non-ciliated zone along the distal margin of the lamella (indifferent epithelium) surrounds a central ciliated region (sensory epithelium). In the sensory epithelium, the type 1 ciliated cells, type 2 ciliated cells and microvillous cells are scattered evenly but rather sparsely.
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