Normal internal carotid artery angiogram

An angiogram showing the normal radiographic appearance of the internal carotid artery and its branches. The internal carotid enters the skull at the carotid foramen, passes anteromedially, and then rises vertically (C6) to pass forward opposite the sella turcica (C4). The artery then passes upward within the dura (C3) and emerges below and medial to the anterior clinoid (C2), giving rise to the ophthalmic artery. The carotid then bifurcates (C1) to form the anterior and middle cerebral arteries. The anterior cerebral artery is directed anteromedially (A1) until it reaches the midline, where it turns upward (A2) to be joined by the anterior communicating artery. The middle cerebral artery extends laterally (M1).