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The terminal ventricle (ventriculus terminalis, or fifth ventricle) is widest part of the central canal of the spinal cord that is located at or near the conus medullaris.〔(【引用サイトリンク】title=ventriculus terminalis )〕 It was described by Stilling in 1859 and Krause in 1875. Krause introduced the term fifth ventricle after observation of normal ependymal cells.〔 The central canal expands as a fusiform terminal ventricle, and approximately 8–10 mm in length in the conus medullaris (or conus terminalis).〔Williams & Warwick. Gray's Anatomy .THIRTY-SEVENTH EDITION.ISBN 0 443 04177 6〕 Although the terminal ventricle is visible in the fetus and children, but is usually absent in adults.〔 ==Detection and Diagnosis== Sometimes, the terminal ventricle is observed by MRI or Sonography in children less than 5 years old. An MRI scan can be particularly helpful in its detection. In pathological conditions, an MRI is useful at the level of the conus medullaris that findings may be related to the following: * Spina bifida * Arnold-Chiari syndrome * Tumors of the conus medullaris * Myelomeningocele * Syringomyelia * Hydromyelia. In hydromyelia, a dilation of the central canal of the spinal cord is caused by an increase of cerebrospinal fluid.〔(【引用サイトリンク】title=imaging in syringohydromyelia )〕 * Syringohydromyelia (i.e., both Syringomyelia and Hydromyelia)〔 * Tethered cord In some cases, the terminal ventricle may cause clinical symptoms due to its expansion. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Terminal ventricle」の詳細全文を読む スポンサード リンク
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