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The rhomboid fossa is a rhombus-shaped depression that is the anterior part of the fourth ventricle. Its anterior wall, formed by the back of the pons and the medulla oblongata, constitutes the floor of the fourth ventricle. It is covered by a thin layer of grey matter continuous with that of the spinal cord; superficial to this is a thin lamina of neuroglia which constitutes the ependyma of the ventricle and supports a layer of ciliated epithelium. ==Parts== The fossa consists of three parts, superior, intermediate, and inferior. * The ''superior part'' is triangular in shape and limited laterally by the superior cerebellar peduncle; its apex, directed upward, is continuous with the cerebral aqueduct; its base is represented by an imaginary line at the level of the upper ends of the superior foveae. * The ''intermediate part'' extends from this level to that of the horizontal portions of the taeniae of the ventricle; it is narrow above where it is limited laterally by the middle peduncle, but widens below and is prolonged into the lateral recesses of the ventricle. * The ''inferior part'' is triangular, and its downwardly directed apex, named the ''calamus scriptorius'', is continuous with the central canal of the closed part of the medulla oblongata. The sulcus limitans forms the lateral boundary of the medial eminence. 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「Rhomboid fossa」の詳細全文を読む スポンサード リンク
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