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An ependymoma is a tumor that arises from the ependyma, a tissue of the central nervous system. Usually, in pediatric cases the location is intracranial, while in adults it is spinal. The common location of intracranial ependymomas is the floor of the fourth ventricle. Rarely, ependymomas can occur in the pelvic cavity.
Pediatric ependymomas are similar in nature to the adult form of ependymoma in that they are thought to arise from radial glial cells lining the ventricular system.However, they differ from adult ependymomas in which genes and chromosomes are most often affected, the region of the brain they are most frequently found in, and the prognosis of the patients.
A subependymoma is a type of brain tumor; specifically, it is a rare form of ependymal tumor. [1] They are usually in middle aged people. Earlier, they were called subependymal astrocytomas.
The ependyma is the thin neuroepithelial (simple columnar ciliated epithelium) lining of the ventricular system of the brain and the central canal of the spinal cord. [1] The ependyma is one of the four types of neuroglia in the central nervous system (CNS).
This is the pronunciation key for IPA transcriptions of English on Wikipedia. It provides a set of symbols to represent the pronunciation of English in Wikipedia articles, and example words that illustrate the sounds that correspond to them.
The English spoken in the West Indies, [103] in Africa [104] and in India [105] are probably better characterized as syllable-timed, though the lack of an agreed scientific test for categorizing an accent or language as stress-timed or syllable-timed may lead one to doubt the value of such a characterization.
The International Phonetic Alphabet (IPA) can be used to represent sound correspondences among various accents and dialects of the English language. These charts give a diaphoneme for each sound, followed by its realization in different dialects.
A pronunciation respelling for English is a notation used to convey the pronunciation of words in the English language, which do not have a phonemic orthography (i.e. the spelling does not reliably indicate pronunciation). There are two basic types of pronunciation respelling: