Innervation of the Caudal-Fin Muscles in the Teleost Fish, Medaka(Oryzias Latipes)(Morphology)

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The peripheral pattern of the spinal nerves in the caudal fin and the spinal motoneurons that innervate the caudal-fin muscles were described in the adult medaka. The peripheral nerves were immunochemically stained by using antibodies to neurofilament proteins. To label the spinal motoneurons retrogradely, horseradish peroxidase was applied to each caudal-fin muscle. The somata of motoneurons innervating the caudal-fin muscles were distributed over the whole area in the motor column from spinal segment 25 to 28 of the ipsilateral spinal cord. Most motoneurons were small (6-15 micra in diameter), but larger ones (more than 20 micra in diameter) were sometimes found. The axon of each motoneuron, rather than entering the nearest ventral root, ran caudad in the anterior funiculus of the spinal cord for the length of several spinal segments before entering a single ventral root. The axon that starts from the anterior segment of the spinal cord entered the anterior ventral root. Each caudal-fin muscle was innervated by several ventral roots of the spinal nerves from 27 to 31B. The anterior caudal-fin muscles were innervated by the anterior spinal nerves. Thus, motoneurons that innervate caudal-fin muscles are organized somatotopically along the cranio-caudal axis of the spinal cord.
社団法人日本動物学会の論文
1992-10-15