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Airway Management
Published in Elizabeth Combeer, The Final FRCA Short Answer Questions, 2019
Nasal air passages = ophthalmic and maxillary divisions of trigeminal nerve: Anterior septum and nares: anterior ethmoidal nerve (V1).Elsewhere: greater and lesser palatine nerves (V2).
Head and neck
Published in Tor Wo Chiu, Stone’s Plastic Surgery Facts, 2018
These are the commonest facial fractures; the nose is a prominent feature and a frequent recipient of trauma due to either interpersonal violence or personal injuries such as falls, sports or RTA. The nasal bones usually fracture in their lower half where the bone is thinner. Experiments by Clark in 1970 showed that the nasal bones are more likely to break (i.e. less force required) from a lateral blow than a frontal blow. Numbness at the tip of the nose indicates anterior ethmoidal nerve injury. Diagnosis may be difficult if the patient presents whilst tissues are oedematous. It is important to rule out a nasoorbitoethmoid (NOE) fracture.
The viva: operative surgery and surgical anatomy
Published in Vivian A. Elwell, Ramez Kirollos, Syed Al-Haddad, Neurosurgery, 2014
Vivian A. Elwell, Ramez Kirollos, Syed Al-Haddad
The anterior ethmoidal foramen is a small opening formed when the anterior ethmoidal notch on the superior margin of the ethmoid bone corresponds to a similar small notch in the frontal bone creating a small foramen in the sutural junction of the two bones. The foramen transmits the anterior ethmoidal nerve, a branch of the nasociliary nerve, into the anterior and middle ethmoidal sinuses and nasal cavity. It also indicates the anterior extent of the cribriform plate. Identification of the anterior ethmoidal artery is an important landmark in endonasal endoscopic surgery as it passes from the orbit to anterior cranial fossa.
Lacrimal Gland Insufficiency in Aqueous Deficiency Dry Eye Disease: Recent Advances in Pathogenesis, Diagnosis, and Treatment
Published in Seminars in Ophthalmology, 2022
Acupuncture is a form of Chinese traditional medical therapy, wherein needles are applied at specific points on the body for neuronal stimulation. It has shown to be effective in treating DED. However, further studies are needed to gauge its efficacy.111–113 Role of anterior ethmoidal nerve stimulation being better than lacrimal nerve stimulation for increasing the aqueous production is also known.114 Intranasal Tear Neurostimulator (TrueTear, Allergan plc) is a similar device designed to deliver microcurrents to the nasal cavity, stimulating the nasolacrimal pathway. It has recently received FDA approval to temporarily increase tear production. It has shown significant improvements in ocular dryness and discomfort compared along with a good safety profile and hence appears to be a promising new management strategy for these patients.115 The iTEAR ®100 device is a similar device; however, unlike TrueTear, this stimulates the anterior ethmoidal nerves at the tip of the nose. Further clinical trials for its efficacy and safety are awaited.
Olfactory nerve schwannoma: how human anatomy and electron microscopy can help to solve an intriguing scientific puzzle
Published in Ultrastructural Pathology, 2022
Fabbri Vp, Valentina Papa, Tonon C, Agati R, Toni F, Zoli M, Mazzatenta D, Fioravanti A, Badaloni F, Cenacchi G, Foschini Mp, Asioli S
Based on the anatomy of olfactory tracts, several theories about the origin of olfactory schwannoma have been proposed, known as developmental and non-developmental. The developmental theories suggest either transformation of the mesenchymal pial cell into ectodermal Schwann cells6 or migration of the neural crest cells within the substance of the central nervous system.6 The non-developmental theories suggest that anterior cranial fossa schwannomas arise from Schwann cells normally present in the adjacent structures such as the perivascular nerve plexus or the meningeal branches of the trigeminal nerve and anterior ethmoidal nerve innervating the anterior cranial fossa and olfactory groove.6
Olfactory schwannomas – an enigmatic clinical entity
Published in British Journal of Neurosurgery, 2023
Georgios F. Hadjigeorgiou, Eleana M. Strouthou, Dimitri Koulousakis, Victor Patsouris, Frauke Neff, Christianto B. Lumenta, David B. Schul
The fact that in many cases the olfactory nerve and bulb were not identified intraoperatively could be due to the proximity of the tumour to these structures. The predominant midline location of the OS excludes their origin from vascular dural plexus, as their distribution in the entire anterior fossa is not equal. Take all these into consideration, we could support that the meningeal branch of the trigeminal nerve and the anterior ethmoidal nerves are the most probable origin of this category of schwannomas.39