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Objective: To find out the distribution of nerve endings in the dural sheath of cervical nerve roots and to study the mechanism of cervical radicular pain., Method: 2069 20 microm serial sections were made from 39 cervical root-dorsal root ganglion specimens obtained from 18 postmortems. By using optical microscope and Suzuki silver impregnation method and Klüver-Brrera method, we examined the morphology, quantity and distribution of the nerve ending in the nerve sheath of the root, dorsal root ganglion (DRG) and the spinal nerve of these sections., Result: There were several kinds of nerve endings such as free nerve endings in the nerve sheath of the root, the dorsal root ganglion, and the spinal nerve. Free nerve endings were distributed in the proximal and distal portions of DRG sheath more extensive than that in other parts of the dural root-sheaths., Conclusion: The free nerve endings in the dural root-sheaths especially those in the DRG sheath are thought to play an important role in cervical radicular pain.

To quantitatively evaluate the acoustic characteristics of glottal stop, pronunciation of/ka/in 10 normal subjects and 14 patients with cleft palates were analyzed by sound spectrography and 20 msec in all normal articulation of /ka/ with an average time of 44.6 msec.In the test group of /ka/ demonstrated an average time of 20.8 msec.The inverse correlation ship between VOT and the psyco-acoustical judgment for the degree of distortion was demonstrated to be significant.