Mechanoreceptor Cells of the Lamprey Spinal Cord: Direct Connections with Identified Segmental Neurons

  • I. V. Batueva


The organization of primary segmental afferents which act on motoneurons in various species of vertebrates is not quite clear. As is known, direct connections with motoneurons in mammals are formed by afferents from intrafusal muscle fibers. As to the lower (aquatic) vertebrates, they lack muscle spindles (Bone, 1964). Therefore the suggestion was made that they can have no direct connection between the primary afferents and motoneurons. Thus, only polysynaptic responses of motoneurons were described in bony fishes under dorsal root stimulation (Bando, 1975). However, monosynaptic responses were obtained in rays (Leonard et al., 1978) and lampreys (Birnberger and Rovainen, 1971).


Primary Afferents Anterograde Transport White Muscle Fiber Dorsal Cell Intrafusal Muscle Fiber 
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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • I. V. Batueva
    • 1
  1. 1.Sechenov InstituteUSSR Academy of SciencesLeningradUSSR

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