Figure 9 The sagittal sinus divides into two transverse sinuses at the level of the external occipital protuberance and the nuchal ridge on the occiput The sagittal sinus divides into two transverse sinuses at the level of the external occipital protuberance and the nuchal ridge on the occiput. Recognizing the location of the transverse sinuses is critical to understanding occipital fixation. Violation of the transverse sinuses can lead to fatal complications of bleeding or thrombosis. Level: Structures: Other Structures: Pathology: Procedure: View: Occiput Dura Vascular: Transverse and sagittal sinus None Normal None Composite (3/4), Front, Lateral, Caudal