To provide anatomic basis of cranial outer table flap pedicled with the occipital artery for occipitocervical fusion.Methods:The course,branches and distribution of the occipital artery were observed on 40 adult cadavers perfused with latex and 8 cephalocervical vascular castings(5 castings preserved bones).The operation was imitated on 2 cadavers.Results:The occipital artery originated from the external carotid artery.It ran through the occipital artery channel of temporal bone and perforated to the nucha.The perforaing point is 1.0±0.1 cm in...