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endocranium
The endocranium in comparative anatomy is a part of the skull base in vertebrates and represent the basal, inner part of the cranium. The term is also applied to the outer layer of the dura mater in human anatomy.〔The American Heritage Medical Dictionary, 2004. Houghton Mifflin Company, USA〕 ==Structure== Structurally, the endocranium consists of a boxlike shape, open at the top. The posterior margin exhibit the ''foramen magnum'', an opening for the spinal cord. The floor of the endocranium has several paired openings for the cranial nerves, and the anterior margin holds a spongy construction, allowing for the external nasal nerves to pass through.〔Romer, A.S. & T.S. Parsons. 1977. ''The Vertebrate Body.'' 5th ed. Saunders, Philadelphia. (6th ed. 1985)〕 All bones of the structure derive from the cranial neural crest during fetal development.
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「endocranium」の詳細全文を読む
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