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''For acquired fourth nerve palsy, see fourth nerve palsy'' Congenital fourth nerve palsy is a condition present at birth characterized by a vertical misalignment of the eyes due to a weakness or paralysis of the superior oblique muscle. Other names for fourth nerve palsy include superior oblique palsy and trochlear nerve palsy. When looking to the right/left the nerve/muscle isn't strong enough or is too long and the eye drifts up. ==Pathophysiology== The fourth cranial nerve innervates the superior oblique muscle for each eye. The superior oblique muscle is one of the six extraocular muscles that allow movement of eye. Specifically, the superior oblique muscle primarily intorts the eye (such that the top of the eye rolls toward the nose), with secondary actions of depression (downgaze) and abduction (looking away from the nose). When this muscle’s function is diminished due to a fourth cranial nerve (CN IV) palsy, the affected eye will extort, deviate upward (hypertropia), and, to a smaller extent, drift inward. 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「congenital fourth nerve palsy」の詳細全文を読む スポンサード リンク
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