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The occipital bone , a saucer-shaped membrane bone situated at the back and lower part of the skull, is trapezoidal in shape and curved on itself. It is pierced by a large oval opening, the foramen magnum, through which the cranial cavity communicates with the vertebral canal. * The curved, expanded plate behind the foramen magnum is named the squama occipitalis. * The thick, somewhat quadrilateral piece in front of the foramen is called the basilar part of occipital bone, - the basioccipital. * On either side of the foramen are the lateral parts of occipital bone, -the exoccipitals. ==Structure== The occipital, like the other cranial has outer and inner tables, between which is the cancellous tissue or diploë; the bone is especially thick at the ridges, protuberances, condyles, and anterior part of the basilar part; in the inferior fossæ it is thin, semitransparent, and destitute of diploë. 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「occipital bone」の詳細全文を読む スポンサード リンク
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