Electrophysiological Tracings of Intraretinal Optic Nerve Fibers in the Cat

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  • Ogawa Tetsuro
    Department of Physiology, Tohoku University School of Medicine
  • Imazawa Yoshiyuki
    Department of Physiology, Tohoku University School of Medicine
  • Chu Shingo
    Department of Physiology, Tohoku University School of Medicine

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The running course of intraretinal optic nerve fibers was traced on a tangent screen at 1m by plotting centers of receptive fields of units as many as possible recorded at a given electrode position in the cat's retina. Antidromic activation of units by stimulation of either the contralateral or ipsilateral optic tract allowed the separation of the contralaterally projecting portion (nasal retina) from the bilaterally projecting portion in the retina. The bilaterally projecting portion includes the vertical median strip of overlap and the temporal retina. Multunit potentials recorded in the retina in response to antidromic stimulation of the optic tract consisted of two separate peaks which indicated the presence of two separate fiber groups in the optic nerve fibers. These peaks correspond to 2.75m/sec and 1.75m./sec in conduction velocity of intraretinal optic nerve fibers.

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