No abstract available.
Myoclonus* ; Spinal Nerve Roots*

No abstract available.
Brachial Plexus* ; Spinal Nerve Roots*

Neurilemmoma is a benign neoplasm arising from the Schwann cell of the nerve sheath. Acoustic nerve is the most common site of neurilemmoma and mandible is the most frequently involved in intraosseous neurilemmoma. Extradurally located dumbbell type neurilemmoma was rarely reported. The histology of neurilemmoma was first described by Verocay in 1908 and elaborated upon by Stout in 1935. Characteristic histologic patterns of neurilemmoma were encapsulation and Verocay bodies, Antoni type A and B areas, palisading nuclei, and lack of malignant characteristics. We experienced such a rare case of neurilemmoma which probably arised from the left first lumbar spinal nerve root, and located extradurally and paravertebrally, and confirmed by radiologic and pathologic findings.
Cochlear Nerve ; Mandible ; Neurilemmoma ; Spinal Nerve Roots

To investigate the variations of the dorsal root of the first cervical nerve and its anastomosis with the spinal accessory nerve, a total of 74 anatomical dissections has been performed in 37 cases of Korean human fetus. The anastomotic connections between the dorsal roots and the spinal accessory nerve have fitted into five main types. The central course of the sensory fibers of the first cervical nerve and the neurosurgical significance of the variations have been discussed. Often the only pathway for the sensory fibers of the first cervical nerve to reach the spinal cord is through the rootlets of the spinal accessory nerve.
Accessory Nerve ; Fetus ; Humans ; Spinal Cord ; Spinal Nerve Roots*

This experimental study was designed to develop an electromyography(EMG) machine and a program to be used during the selective dorsal rhizotomy, and to investigate the patterns of EMG waves generated by stimulation of the normal spinal nerve roots in cat. The developed machine, consisting of nerve stimulator, EMG amplifier, analogue-digital converter and computer program, functioned well during experiment without any mechanical or electrical problems. We were able to record pure H-wave(Hoffmann wave) in EMG by stimulating posterior root in most cases, although components of motor and directly conducted waves were observed only in few cases. The peak latency of H-wave, which was about half of that of the motor wave by the mean value, was consistent as a whole. H2/H1 ratio (the ratio of the second and the first H-wave), peak amplitude and the pattern of changes of the peak amplitudes with continuous sitmulation, however, varied greatly from case to case. In conclusion, the results of this experiment suggest that EMG wave patterns, generated by the stimulation of the posterior nerve roots, may not be appropriate for the determination of the nerve roots to be cut during the selective dorsal rhizotomy.
Animals ; Cats ; Reflex* ; Rhizotomy* ; Spinal Nerve Roots* ; Spinal Nerves*

Primary malignant melanoma of the nervous system is a rare disease, and accounts for only 1% of melanoma cases. Primary melanomas on the spinal nerve root, particulary the cervical spinal nerve root, are extremely rare. Only a few cases of primary melanoma arising from the spinal nerve root have been reported. We report our experience with a case of primary malignant melanoma of the cervical spinal nerve root.
Melanoma ; Nervous System ; Rare Diseases ; Spinal Nerve Roots ; Spinal Nerves

OBJECTIVE: Dorsal root entry zone(DREZ) operation has been the most common surgical treatment for paraplegic pain in the past, but the results differ according to the patients. In this study, we attempt to analyze the results from the patients by the different patterns of the pain before the surgery. METHODS: A total of twelve paraplegic patients have undergone a total of thirteen radiofrequency DREZ coagulation procedures between April 1994, and March 2003. The patients were divided depending on patients' subjective description on the character, frequency, and range of pain. RESULTS: The patients were divided into the two groups, postoperatively: improvement of more than 75% of pain was defined as treatment success, and any level less than 75% of improvement was defined as treatment failure. Eight of the ten mechanical pain group cases were regarded as treatment success, and remaining two cases with thermal type of pain as treatment failure. Also, one case with combined pain failed to obtain any favorable outcome. Intermittent pain group (6 of 7 cases), continuous pain group (2 of 6 cases), and localized pain group (7 of 11 cases) showed treatment success, respectively. However, diffuse pain group (1 of 2 cases) resulted in poor outcome. CONCLUSION: Radiofrequency DREZ coagulation is more effective in managing intermittent and/or mechanical pain than continuous and/or thermal pain in the paraplegic patients following spinal cord injury.
Humans ; Spinal Cord Injuries ; Spinal Nerve Roots* ; Treatment Failure

No abstract available.
Animals ; Calcium* ; Clonidine* ; Ganglia, Spinal* ; Rats* ; Spinal Nerve Roots* ; Tetracaine*

No abstract available.
Animals ; Capsaicin* ; Ganglia, Spinal* ; Rats* ; Spinal Nerve Roots*

We observed a slender nerve branch of the lateral root of the median nerve innervating the brachialis muscle, which is normally innervated by the musculocutaneous nerve, at the left arm of a Korean male (age, 74 years). The present nerve branch was accompanied with the communicating branch between the median and musculocutaneous nerves and supplied to the medial inferior portion of the brachialis muscle. The spinal root origins of this branch were C5 and C6. The nerve fiber number of the nerve branch innervating the brachialis muscle was 328. This variation may be very rare case and was different from previous observation.
Arm ; Humans ; Male ; Median Nerve ; Muscles ; Musculocutaneous Nerve ; Nerve Fibers ; Spinal Nerve Roots