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The clivus (Latin for "slope") is a part of the cranium at the skull base, a shallow depression behind the dorsum sellæ that slopes obliquely backward. It forms a gradual sloping process at the anterior most portion of the basilar occipital bone at its junction with the sphenoid bone. On axial planes, it sits just posterior to the sphenoid sinuses. Just lateral to the clivus bilaterally is the foramen lacerum (the internal carotid artery reaches the middle cranial fossa above the foramen lacerum), proximal to its anastomosis with the Circle of Willis. Posterior to the clivus is the basilar artery. The pons sits on the clivus. Clinical Importance:Clivus is also the site for chordoma (a rare malignant tumour.) Clivus is also used as an abbreviated term for the clivus ocularis which is the sloping inner wall of the retina as it dips into the foveola in the macula of the eye. For this reason, and to disambiguate, the clivus is sometimes referred to as the Blumenbach clivus. ==Relation of the clivus and dens== The clivus is an important landmark for checking for anatomical atlanto-occipital alignment; the clivus, when viewed on a lateral C-spine X-ray, forms a line which, if extended, is known as ''Wackenheim's clivus line''. ''Wackenheim's clivus line'' should pass through the dens of the axis or be tangential to it.〔McKenna DA, Roche CJ, Lee KW, Torreggiani WC, Duddalwar VA. Atlanto-occipital dislocation: case report and discussion. ''Can J Emerg Med'' 2006; 8(1):50-3. Available at: (link ) and (link ). Accessed on: December 7, 2006.〕 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「Clivus (anatomy)」の詳細全文を読む スポンサード リンク
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