魚類コイ科の迷路特に球形嚢と聴覚に関する研究

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タイトル別名
  • A STUDY OF THE LABYRINTH OF CYPRINUS, IN PARTICULAR REFERENCE TO THE RELATIONSHIP BETWEEN HEARING AND SACCLUS
  • ギョルイ コイカ ノ メイロ トクニ キュウケイノウ ト チョウカク ニ カンスル ケンキュウ

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Sound stimulation(256, 512, 1024 and 2048cps) was given to the fish(carassius auratus Linne) in water and hearing test was performed by observing the responses to sound, particularly the backing movement of pectoral fins.<br>The response disappeared when the lower portion of the labyrinth was destructed or the swimbladder was ruptured, while the fish responded normally after the destruction of upper portion of the labyrinth, lateral-line organ and the sensory organs of the skin and the extraction of the lateral line nerve.<br>Morphological studies of the fish labyrinth were performed and the remarkable findings were as follows.<br>1) The whole labyrinth is found encapsulated in u semitransparent elastic membrane(Membrana propria), which histologically resembles bone tissue.<br>There exists no space between the M.propria and the membranous labyrinth.<br>2) The sacculus is small but has a complicated structure.The infero-medial part of the wall (bridge), which is not covered by M.propria and histologically double-layered, makes up the laterosuperior wall of the cavity, which can be reasonably called as the perilymphatic space because of its direct communication to the intracranial space.<br>The sagitta is fixed to the macula sacculi at the superior and inferior edge and its wing-like process touches the bridge.<br>3) Sound is transmitted from swimbladder to the sacculus via the Weberian ossicles, sinus impar and ductus communicans.<br>4) The macula sacculi is more densely innervated and vascularized than the macula of the utriculus and Lagena.<br>Morphologically, it seems reasonable to presume that the vibration of"bridge"be percepted by the sensory hairs of the macula sacculi.

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