tautomeric fibers

tau·to·mer·ic fi·ber's

nerve fibers of the spinal cord that do not extend beyond the limits of the spinal cord segment in which they originate.

tau·to·mer·ic fi·bers

(taw'tō-mer'ik fī'bĕrz)
Nerve fibers of the spinal cord that do not extend beyond the limits of the spinal cord segment in which they originate.