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The cave of septum pellucidum (CSP) describes a septum pellucidum that has a separation between its two leaflets (septal laminae). This cavity contains cerebrospinal fluid (CSF) that filters from the ventricles through the septal laminae. The cave of septum pellucidum is bounded anteriorly by the genu of the corpus callosum; superiorly by the body of the corpus callosum; posteriorly by the anterior limb and pillars of the fornix; inferiorly by the anterior commissure and the rostrum of the corpus callosum; and laterally by the leaflets of the septum pellucidum. There are individual differences in the degree of CSP; whereas some have complete closure of the cavum, others present with a small degree (4-6mm in the coronal plane) of incomplete closure. The most common type of CSP is noncommunicating, that is, it does not connect to the brain's ventricular system. Because of this lack of communication, the erstwhile term for CSP, the "fifth ventricle," is not anatomically correct and its use has fallen out of favor in recent years. CSP is present in 100% of fetuses, but over 85% of them fuse by 3–6 months after birth. ==Cause== The cause of CSP is basically unknown, although it is thought that prenatal alcohol exposure plays a significant role.〔 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「Cave of septum pellucidum」の詳細全文を読む スポンサード リンク
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