Objective: To provide applied anatomical data of abducens nerve for the skull base surgery.

Methods in July, 1997, a 26-year-old man was admitted for right-sided severe headache, dizziness, nausea, vomiting, facial and abducens nerve palsy.

Triangle of abducens nerve was formed by the petrosphenoidal ligament, the medial wall of Meckel's cave and the posterolateral wall of ICA, and abducens nerve passed through this triangle.