Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “CRANIAL NERVES”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources
PubMed1997

Contribution of the eighth nerve and cranial nerve nuclei to the short-latency vestibular evoked potentials in cats.

The object of this study was to assess the contributions of the vestibular nerve and various cranial nerve nuclei to the short-latency vestibular evoked potentials in cat. The following nuclei were investigated: vestibular nuclei and the third, sixth, and tenth cranial nerve nuclei. In unilateral labyrinthectomized cats, we performed suboccipital craniectomy and partial cerebellectomy to place bipolar electrodes into the neural structures under investigation. The surface-recorded vestibular evoked potentials (far field) were compared with the potentials recorded intracranially in response to the same acceleration impulses. The exact locations were later confirmed histologically. Reversible lesions also were induced by injection of lidocaine 2%. The results indicate that the first wave of the vestibular evoked potentials originates in the vestibular nerve, and the second wave is mainly generated in the superior and medial vestibular nuclei. The third, sixth, and tenth cranial nerve nuclei apparently contribute to the later waves of the vestibular evoked potentials, particularly waves 3 and 4.

Abducens Nerve↗
PubMed2005

Localized transcranial electrical motor evoked potentials for monitoring cranial nerves in cranial base surgery.

OBJECTIVE: To describe a novel monitoring technique that allows "functional" assessment of cranial nerve continuity during cranial base surgery. METHODS: Facial motor evoked potentials (MEP) in 71 consecutive patients were obtained by localized transcranial electrical stimulation in all patients requiring facial nerve monitoring during the period from November 2002 to August 2004. With transcranial electrical stimulation localized to the contralateral cortex, facial nerve MEPs are obtained through stimulation of more proximal intracranial structures. RESULTS: Logistic regression revealed that the final-to-baseline facial MEP ratio predicted satisfactory (House-Brackmann Grade 1 and 2 function) immediate postoperative facial function (0.005 > P > 0.0005). Contingency table analysis showed high correlation (chi2, P < or = 2 x 10(8)) and acceptable test characteristics using a 50% final-to-baseline MEP ratio. CONCLUSION: Facial nerve MEPs recorded intraoperatively during cranial base surgery using the proposed technique predicts immediate postoperative facial nerve outcome. This technique can also be used to monitor other motor cranial nerves in cranial base surgery.

Adult↗
PubMed2002

A case of multiple schwannomas of the trigeminal nerves, acoustic nerves, lower cranial nerves, brachial plexuses and spinal canal: schwannomatosis or neurofibromatosis?

In most cases, while schwannoma is sporadically manifested as a single benign neoplasm, the presence of multiple schwannomas in one patient is usually indicative of neurofibromatosis 2. However, several recent reports have suggested that schwannomatosis itself may also be a distinct clinical entity. This study examines an extremely rare case of probable schwannomatosis associated with intracranial, intraspinal and peripheral involvements. A 63-year-old woman presented with a seven-year history of palpable lumps on both sides of the supraclavicular area and hearing impairment in both ears. On physical examination, no skin manifestations were evident. Facial sensory change, deafness in the left ear and decreased gag reflex were revealed by neurological examination. Magnetic resonance imaging revealed multiple lesions of the trigeminal nerves, acoustic nerves, lower cranial nerves, spinal accessory nerve, brachial plexuses, and spinal nerves. Pathological examination of tumors from the bilateral brachial plexuses, the spinal nerve in the T8 spinal position and the neck mass revealed benign schwannomas. Following is this patient case report of multiple schwannomas presenting with no skin manifestations of neurofibromatosis.

Brachial Plexus Neuropathies↗
PubMed1993

Primary tumors of the brain, cranial nerves and cranial meninges in Victoria, Australia, 1982-1990: patterns of incidence and survival.

This report presents for the first time a detailed analysis of the distribution of primary brain tumors in a population in Australia. Data on 3,575 cases of benign and malignant tumors of the brain, cranial nerves and cranial meninges diagnosed among residents of the state of Victoria from 1982 to 1990 are used to calculate incidence rates and survival by histologic type, age and sex and to compare incidence of birthplace, socioeconomic status and year of diagnosis. No sharp decline in incidence rates is seen among those over age 60 and only small increases in incidence over the 9-year period have been observed. The overall incidence rates, distributions by histologic type, and patterns of excess incidence among those born in Southern and Eastern Europe and the Middle East are similar to observations in other geographic areas. No clear trend relating incidence and socioeconomic status is observed. Survival after brain tumor diagnosis is better among women then men (52 vs. 37% survive 5 years); this difference is attributable to the greater frequency among men of the more aggressive tumor types. The most striking male over female excess is for medulloblastoma, a type that occurs predominantly in the pediatric age group. This excess coupled with the fact that this tumor occurs at a much younger age in males may suggest the presence of a genetic predisposition in some patients with this disease.

Adolescent↗
PubMed1989

Descriptive epidemiology of primary tumors of the brain, cranial nerves and cranial meninges in Los Angeles County.

This report presents data on the distribution of 8,612 cases of primary tumors of the brain, cranial nerves and cranial meninges (both benign and malignant) diagnosed among residents of Los Angeles County from 1972 to 1985. Incidence rates of gliomas, meningiomas, nerve sheath tumors and all histologic types combined are presented for specific age, sex and ethnic groups. At all ages, the highest incidence is seen for gliomas among men. Meningioma rates are higher among women than men in every ethnic group. In both sexes, glioma rates are highest among whites, and meningioma rates are highest among blacks. Asians have the lowest rates of both types of tumors. Proportional incidence ratios are elevated among those born in Eastern Europe, Southern Europe and the Middle East and among Jewish residents of Los Angeles County. A clear trend of increasing glioma incidence with increasing social class is seen among males. An analysis among white men aged 25-64 by occupation and industry at the time of diagnosis supports several previously published findings. A glioma excess is evident among workers in the aircraft industry. Workers in the petroleum industry and the rubber and plastics industry have an excess of meningiomas. Occupational groups at excess risk include dentists who have an increased risk of all types of brain tumors and electricians whose excess risk is limited to gliomas.

Adolescent↗
PubMedDate not supplied

On the presence of ganglion cells in the intracranial portion of the accessory nerve (XI cranial nerve) in some mammals.

The intracranial tract of the accessory nerve (XI cranial nerve) was studied in some mammals (equines, domestic and wild ruminants, pig, carnivores, rabbit, nutria, guinea pig, hamster, hedgehog). The specimens were embedded in paraffin or paraplast, the sections were stained with cresyl violet, haematoxylin and eosin, or submitted to argentic impregnation. Pseudounipolar ganglion cells were found in all the mammals examined, with the exception of the cat. The number of cells and their variability in the different species and subjects were related. The topography and morphology of the cells were described. This comparative study has demonstrated that the accessory nerve is not a entirely motor nerve, but it is a mixed, motor and sensitive, nerve. Nevertheless, we think further studies are necessary in order to establish the peripheral distribution, the central pathway and the functional role of the pseudounipolar neurons found in the intracranial tract of the accessory nerve.

Accessory Nerve↗
PubMed2006

[MRI performance and diagnosis of schwannomas from cranial nerves in posterior cranial fossae].

BACKGROUND & OBJECTIVE: Cranial nerve schwannomas originate frequently in posterior cranial fossae and have various and complex MRI performances, some of which are still not well known. This study was to explore MRI performances and features of schwannomas from cranial nerves in posterior cranial fossae. METHODS: The MRI performances of 75 cases of schwannoma from cranial nerves in posterior cranial fossae, including trigeminal (n=9), facial (n=1), acoustic (n=53), 9th-11th (n=9) and hypoglossal (n=3) schwannomas, confirmed by surgical and pathologic findings, were analyzed retrospectively. RESULTS: Most of schwannomas in posterior cranial fossae were solid-cystic lesions when their sizes were larger than 1.5 cm in diameter. Small lesions (less than 1.5 cm in diameter) may be completely solid, which were closely related to cranial nerves. On T1WI, the solid part of tumor appeared iso- or slightly hypointense, while cystic part was hypointense. On T2WI, solid part appeared high or slightly high signal intensity, but cystic part appeared very high signal intensity. On contrast-enhanced T1WI, there was obvious enhancement in the solid part, but not in the cystic part. Some typical signs were very useful to infer tumor origin, such as, dumbbell-shaped trigeminal schwannoma extended across the middle and posterior cranial fossa, enlargement of internal auditory canal, widened jugular foramen and hypoglossal foramen caused by acoustic schwannoma, the 9th-11th shcwannoma, and hypoglossal schwannoma, respectively. The correct ratio for qualitative diagnosis of schwannoma was 92% using MRI, but the incorrect ratio for identifying the nerve of tumor origin was 8.7%. CONCLUSION: MRI is a good method in qualitative diagnosis of schwannoma and identifying cranial nerves of tumor origin in posterior cranial fossae.

Adolescent↗
PubMed1993

Descriptive epidemiology of primary cancer of the brain, cranial nerves, and cranial meninges in New Zealand, 1948-88.

We used New Zealand data on occurrence of different types of brain cancer to investigate: (i) a possible secular increase which has been seen worldwide and has generated considerable debate; (ii) possibly higher rates among Maori; and (iii) possibly higher risks related to social class and occupation. Data from the NZ Cancer Registry on the 5,684 brain cancers diagnosed among NZ residents from 1948-88 were used to study the pattern of occurrence by gender, age, race, calendar year, social class, occupation, and histology. Age-standardized brain-cancer incidence rates per 100,000 more than doubled over the 41-year period (from 2.9 to 6.9 in males and from 2.1 to 5.1 in females). A strong trend of increasing incidence with increasing social class is seen in males (Ptrend = 0.01). Among Maori, the proportion of all brain cancer that is medulloblastoma is four times that among non-Maori, and the proportion of all brain cancers that lack histologic confirmation is about 40 percent higher. Elevated risks are seen among: dairy farmers (odds ratio [OR] = 3.4, 95 percent confidence interval [CI] = 1.9-6.0); sheep handlers (OR = 2.7, CI = 1.4-5.3); livestock workers (OR = 3.8, CI = 1.7-8.4); and farm managers (OR = 3.2, CI = 1.4-7.2); as well as among electrical engineers (OR = 8.2, CI = 20-34.7); electricians (OR = 4.6, CI = 1.7-12.2); and other electrical workers. Brain cancer rates in NZ have increased steadily since 1948, but this increase has leveled off in the most recent five-year period. Although brain cancer rates are likely to be underestimated among the Maori, an excess of medulloblastoma is evident in this group.

Adolescent↗
PubMed1994

Vascular permeability to sodium fluorescein in the rabbit cranial nerve root: possible correlation with normal cranial nerve enhancement on gadolinium-enhanced magnetic resonance imaging.

Vascular permeability in cranial nerve roots was examined after intravenous injection of sodium fluorescein in the adult rabbit. Fluorescence was observed in the distal nerves through the following portions: intracavernous portion of the oculomotor nerve, distal internal auditory canal segment of the facial nerve, and ganglionic portions of the trigeminal, glossopharyngeal and vagus nerves. In the acoustic nerve, the vestibular ganglion showed fluorescence. No fluorescence was observed in the olfactory or optic nerves. During in vivo gadolinium-enhanced magnetic resonance imaging (Gd-MRI) of two separate animals, trigeminal nerve enhancement was observed in the region showing fluorescence. Histologically, intense fluorescence was observed in ganglia and external nerve sheaths of the cranial nerves showing macroscopic fluorescence. A slight fluorescence was also seen in endoneurial connective tissue but not observed within the nerve fibers. The results of this study suggest that the physiological enhancement of human cranial nerves seen on Gd-MRI may correlate with vascular permeability.

Animals↗
PubMed2001

Spontaneous carotid dissection presenting lower cranial nerve palsies.

Cranial nerve palsy in internal carotid artery (ICA) dissection occurs in 3--12% of all patients, but in 3% of these a syndrome of hemicranias and ipsilateral cranial nerve palsy is the sole manifestation of ICA dissection, and in 0.5% of cases there is only cranial nerve palsy without headache. We present two cases of lower cranial nerve palsy. The first patient, a 49-year-old woman, developed left eleventh and twelfth cranial nerve palsies and ipsilateral neck pain. The angio-RM showed an ICA dissection with stenosis of 50%, beginning about 2 cm before the carotid channel. The patient was treated with oral anticoagulant therapy and gradually improved, until complete clinical recovery. The second patient, a 38-year-old woman, presented right hemiparesis and neck pain. The left ICA dissection, beginning 2 cm distal to the bulb, was shown by ultrasound scanning of the carotid and confirmed by MR angiogram and angiography with lumen stenosis of 90%. Following hospitalisation, 20 days from the onset of symptoms, paresis of the left trapezius and sternocleidomastoideus muscles became evident. The patient was treated with oral anticoagulant therapy and only a slight right arm paresis was present at 10 months follow-up. Cranial nerve palsy is not rare in ICA dissection, and the lower cranial nerve palsies in various combinations constitute the main syndrome, but in most cases these are present with the motor or sensory deficit due to cerebral ischemia, along with headache or Horner's syndrome. In the diagnosis of the first case, there was further difficulty because the cranial nerve palsy was isolated without hemiparesis, and the second case presented a rare association of hemiparesis and palsy of the eleventh cranial nerve alone. Compression or stretching of the nerve by the expanded artery may explain the palsies, but an alternative cause is also possible, namely the interruption of the nutrient vessels supplying the nerve, which in our patients is more likely.

Adult↗