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Objective: Although the effect of oculomotor and cervical sympathetic networks on pupil diameter is well known; the effect of the trigeminal nerve on pupil diameter has not been investigated yet. This subject was investigated.
Materials And Methods: Five of 23 rabbits were used as a control group (GI; = 5); 0.5 ccs saline solution into cisterna magna injected animals used as SHAM (GII; = 5); autologous blood injected to produce SAH used as the study group (GIII; = 13) and followed up three weeks. Light-stimulated pupil diameters were measured with an ocular tomography device before, middle, and at the end of the experiment. Considering the sclera area/pupil area ratio index (PRI) as the pupillary reaction area, we used this equation for the pupil's rush to light. Degenerated neuron densities of trigeminal ganglia and pupil diameters compared with the Mann-Whitney U test.
Results: The PRI, degenerated neuron density of trigeminal ganglia (n/mm) were: (2.034 ± 0.301)/(13 ± 3) in GI; (1.678 ± 0.211)/(46 ± 9) in GII; and (0.941 ± 0.136)/(112 ± 21) in GIII. P-values between groups as: < 0.005 in GI/GII; < 0.0001 in GII/GIII and < 0.00001 in GI/GIII.
Conclusion: Light stimulates the cornea which is innervated by the trigeminal nerves. This experimental study indicates that the pupil remains mydriatic as the cornea is damaged by trigeminal ischemia following SAH and blocks the light flow.
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http://dx.doi.org/10.1080/01616412.2023.2262243 | DOI Listing |
J Neurosurg Case Lessons
December 2024
Division of Neurosurgery, Children's Hospital Los Angeles, Los Angeles, California.
Background: Glossopharyngeal neuralgia (GPN) is a rare condition typically manifesting as paroxysms of sharp, lancinating pain localized to the middle ear and auditory canal, base of the tongue, tonsillar fossa, and region just inferior to the angle of the mandible. Vascular compression is a common etiology, and microvascular decompression (MVD) has been established as a safe and efficacious treatment in adults. With the exception of one report of an adult patient undergoing the procedure for symptomatology that began in adolescence, there are no published cases of MVD for GPN in pediatric patients to the author's knowledge.
View Article and Find Full Text PDFEur J Med Res
December 2024
Department of Neurosurgery, Neuromedicine Center, Beijing Shijitan Hospital, Capital Medical University, No. 10, Tieyi Road, Yangfangdian, Haidian District, Beijing, 100038, People's Republic of China.
Background: Full-endoscopic microvascular decompression (fE-MVD) is an emerging treatment option for trigeminal neuralgia (TN). However, the risk factors associated with postoperative recurrence of TN after fE-MVD procedure remain controversial. The aim of the present study was to summarize the surgical technique of fE-MVD for the treatment of TN and to develop a predictive model for recurrence at 1 year postoperatively based on independent risk factors.
View Article and Find Full Text PDFCell Signal
December 2024
Department of Maxillofacial and Otorhinolaryngology Oncology and Department of Head and Neck Oncology, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China; National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China; Tianjin Key Laboratory of Basic and Translational Medicine on Head & Neck Cancer, Tianjin, China; Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China. Electronic address:
Nerves are often overlooked as key components of the tumor microenvironment. However, the molecular mechanisms underlying the reciprocal interactions between tumors and nerves remain largely unknown. In this study, we analyzed data from The Cancer Genome Atlas (TCGA) and identified a significant association between DKK1 expression and poor prognosis, as well as a correlation between DKK1 expression and myeloid-derived suppressor cell (MDSC) infiltration in head and neck squamous cell carcinoma (HNSCC) and pancreatic ductal adenocarcinoma (PDAC), two cancer types characterized by pronounced tumor-nerve interactions.
View Article and Find Full Text PDFRespir Physiol Neurobiol
December 2024
Department of Physiology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan. Electronic address:
Transient receptor potential ankyrin-1 (TRPA1) is expressed in the trigeminal nerves in the nasal cavity. It detects irritant chemicals such as formalin and acrolein, induces respiratory depression to protect against further inhalation, and elicits avoidance behavior. Although tobacco smoke contains formalin, acrolein, and other irritant chemicals, the possible contribution of TRPA1 to protection against tobacco smoke has yet to be fully understood.
View Article and Find Full Text PDFStomatologiia (Mosk)
December 2024
Russian University of Medicine of Healthcare Ministry of Russia, Moscow, Russia.
The Aim Of The Study: To determine the type of electric current with the greatest diagnostic value used to study the electrical sensitivity of teeth in inferior alveolar nerve neuritis.
Materials And Methods: We examined 32 patients aged from 22 to 57 years, in whom neuritis of the inferior alveolar nerve developed due to traumatic removal of the lower third molar. There were 14 females and 18 males.
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