Operculum

Is a retinal hole as serious as it sounds? Read on to learn about retinal holes — including types, symptoms, causes and treatment — and if you may be at risk of developing a hole in your retina. What is a retinal hole? A retinal hole is a small break or defect in the light-sensitive Retinal holes can occur anywhere in the retina. When a hole develops in the Most retinal holes are harmless, but some are of concern because they may accompany or cause a Types of retinal holes There are two basic types of hole in the retina: Atrophic retinal hole Atrophic retinal holes are small round or oval holes that typically occur in the peripheral retina. This type of retinal hole is associated with degeneration (atrophy) of retinal tissue. Atrophic retinal holes are usually harmless and don’t require treatment. An estimated 5% of the general population has atrophic retinal holes. Operculated retinal hole Operculated retinal holes are round, oval or out-of-round holes where a plug or “cap” (operculum) of retinal tissue is pulled forward into Retinal hole symptoms Symptoms of a hole in the retina depend largely on the type of hole: • Atrophic retinal holes typically have no symptoms. They are typically discovered during a routine • Operculated retinal holes usually have the symptom of a noticeable vitreous floater. This is due to the cap of retinal tissue that has detached from the hole and is floating in the vitreous. Symptoms of operculated retinal holes can also sometimes include flash...

Medical condition Pericoronitis Other names Operculitis Pericoronitis associated with the lower right third molar (wisdom tooth). Pericoronitis is operculum, an area which can be difficult to access with normal operculitis technically refers to inflammation of the operculum alone. Pericoronitis is caused by an accumulation of Pericoronitis is classified into chronic and acute. Chronic pericoronitis can present with no or only mild symptoms and long remissions between any escalations to acute pericoronitis. Classification [ ] A Mesio-impacted, partially erupted mandibular third molar, B Dental caries and periodontal defects associated with both the third and second molars, caused by food packing and poor access to oral hygiene methods, C Inflamed operculum covering partially erupted lower third molar, with accumulation of food debris and bacteria underneath, D The upper third molar has over-erupted due lack of opposing tooth contact, and may start to traumatically occlude into the operculum over the lower third molar. Un-opposed teeth are usually sharp because they have not been blunted by another tooth ( The definition of pericoronitis is inflammation in the soft tissues surrounding the crown of a tooth. This encompasses a wide spectrum of severity, making no distinction to the extent of the inflammation into adjacent tissues or whether there is associated active infection ( pericoronal infection caused by micro-organisms sometimes leading to a pericoronal Typically cases ...

Article: • • • • • Images: • Gross anatomy The operculum can be divided into three portions: • the frontal operculum begins at the anterior ramus of the lateral fissure and extends to the inferior portions of the • the parietal operculum lies between the inferior portion of the • the temporal operculum is inferior to the lateral fissure itself and is formed by the superior temporal and Function The function of the operculum depends primarily on the location of each of its segments. The frontal operculum rostral to the ascending ramus of the The frontoparietal operculum caudal to the ascending ramus is thought to contain the gustatory cortex and govern discrimination of various taste qualities. As this portion of the frontoparietal operculum contains inferior portions of the precentral (pars opercularis) and postcentral gyri, it also has a role in primary somatosensory and motor function. The temporal operculum contains History and etymology Operculum is the Latin word for lid or cover. After the dissection of Albert Einstein's brain, there were claims that it was missing the parietal opercula bilaterally allowing his inferior parietal lobe to grow 15% wider than normal. It was thought that this could explain his great mathematical and scientific prowess. However, the debate regarding the legitimacy of these variations still continues. • • • • • • cerebral lobes and gyri • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • ...

Adjective The electroencephalographic laser-evoked potentials (LEPs) were modelled using six equivalent source dipoles located in the left and right fronto- opercular/anterior-insular cortex, left parietal operculum, left primary somatosensory cortex, medial parietal cortex and left medial temporal cortex. — Ncbi Rofl, Discover Magazine, 26 Sep. 2012 In the left fronto- opercular/anterior-insular cortex, negative sounds failed to show the positive potential component at around 260 ms that was observed during positive and especially during neutral sounds. — Ncbi Rofl, Discover Magazine, 26 Sep. 2012 Some people consider the salience network to be the same as another network, called the cingulo- opercular network — the new Neuron paper, for example, refers to them interchangeably. — Quanta Magazine, 5 Dec. 2013 These examples are programmatically compiled from various online sources to illustrate current usage of the word 'opercular.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors.

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A 61-year-old Hispanic female, presented to our primary care clinic with a chief complaint of right eye floaters that had degraded her vision during the previous four days. The patient reported seeing flashes that had subsided in the same eye three months earlier. Testing eventually confirmed a horseshoe retinal tear that required emergency intervention. Fortunately, laser treatment was arranged—but only after initial work-ups and treatment failed to address her most serious problem. Our patient’s case showcases one of many different types of retinal tears that you may encounter in practice. Although some patients require an urgent response, others may need prophylactic therapy, monitoring or some other approach. Here, we discuss many aspects of these complex cases. Discussion A retinal detachment is a separation of the neurosensory retina from the retinal pigment epithelium (RPE). The two classifications of retinal detachment, which differ based on underlying etiologies, include tractional/exudative (also known as serous) and hegmatogenous retinal detachment (RRD). RRD is the most common type of RD. The detachment requires a full-thickness retinal break, vitreous traction and the passage of fluid through the break. The pathogenesis of an RRD may be variable but an acute posterior vitreous detachment (PVD) is commonly the cause. A total of 67% of patients older than 65 years of age develop a PVD, but most experience no adverse sequelae. 1 During a PVD, traction at a site o...

In operculum (Latin, meaning "little lid") (pl. opercula), may refer to the frontal, temporal, or parietal operculum, which together cover the The insular lobe is a portion of the cerebral cortex that has insular) almost surrounded by the groove of the A part of the parietal lobe, the frontoparietal operculum, covers the upper part of the insular lobe from the front to the back. Development [ ] Normally, the insular opercula begin to develop between the 20th and the 22nd weeks of pregnancy. At weeks 14 to 16 of Case reports [ ] Albert Einstein's brain [ ] Opinions differ on whether Einstein's lower parietal lobe (which is involved in mathematical thought, visuospatial cognition and imagery of movement) was 15% larger than average. Figure 9 of Falk 2013 is a photograph of Einstein's right insula after removal of the operculum. (Falk 2013) See also [ ] • • Notes [ ] • • • Joseph M. Tonkonogy; Antonio E. Puente (23 January 2009). Localization of Clinical Syndromes in Neuropsychology and Neuroscience. Springer Publishing Company. p.392. 978-0-8261-1967-4 . Retrieved 12 October 2012. • Larroche JC (1977). "Development of the central nervous system". Developmental Pathology of the Neonate. Amsterdam: Excerpta Medica. pp.319–27. 978-90-219-2107-5. , as cited in note 3 of Chen CY, Zimmerman RA, Faro S, etal. (August 1996). American Journal of Neuroradiology. 17 (7): 1303–11. • Cheng-Yu Chen, Robert A. Zimmerman, Scott Faro, Beth Parrish, Zhiyue Wang, Larissa T. Bilaniuk, Ting-Ywan...