. Cunningham's Text-book of anatomy. Anatomy. BLOOD SINUSES OF THE CKANIUM. 973 Unpaired Sinuses.—These are the superior sagittal, the inferior sagittal, the straight, the anterior and posterior intercavernous, and the basilar. Sinus Sagittalis Superior.—The superior sagittal sinus commences in the anterior fossa of the cranium, at the crista galli, where it communicates, through the foramen caecum, with the veins of the nasal cavity or with the angular vein. It passes first upwards, then posteriorly, and finally downwards in the convex margin of the falx cerebri, grooving the frontal, both th
. Cunningham's Text-book of anatomy. Anatomy. BLOOD SINUSES OF THE CKANIUM. 973 Unpaired Sinuses.—These are the superior sagittal, the inferior sagittal, the straight, the anterior and posterior intercavernous, and the basilar. Sinus Sagittalis Superior.—The superior sagittal sinus commences in the anterior fossa of the cranium, at the crista galli, where it communicates, through the foramen caecum, with the veins of the nasal cavity or with the angular vein. It passes first upwards, then posteriorly, and finally downwards in the convex margin of the falx cerebri, grooving the frontal, both the parietal bones, and upper Olfactory bulb „ Optic nerve Optic cliiasma Anterior cerebral artery Middle cerebra artery Posterior communi- cating artery Oculomotor—_ nerve Posterior cere- bra I artery Superior cere- bellar artery Trochlear nerve Abducent nerve Trigeminal nerve Superior petrosal sinus Facial nerve Xervus in- termedins Acoustic nerve Glossopharyu- / geal nerve Vagus nerve. Accessory nerve Hypoglossal nerve Transverse sinus Vertebral artery Spinal medulla Openings of occipital sinuses Infra-trochlear nerve y Supra-orbital nerve Frontal nerve Sphenoparietal sinus ^Ophthalmic vein Anterior cliuoid process Trochlear nerve Oculomotor nerve Abducent nerve Intercavernous sinus Ophthal. nerve Maxillary nerve Mandibular X. ernous sinus Basilar plexus Semilunar ganglion Basilar artery Inferior petrosal sinus Vertebral artery Sigmoid part of transverse sinus - Transverse sinus Tentorium cerebelli (cut) Occipital sinuses ^ Straight sinus Confluens sinuum uperior sagittal sinus Falx cerebri (cut) Fig. 788.—Basal Blood Sinuses of the Dura Mater. part of the occipital. As it descends it passes slightly to the right side, and it ends, at the level of the internal occipital protuberance, by becoming the right transverse sinus. Instead of passing to the right, it occasionally turns to the left, and ends in the left transverse sinus. In either case its termination is assoc
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