THE DURA MATER OF THE BRAIN. 5 



the jugular foramen, unites with the transverse sinus in forming 

 the internal jugular vein. 

 Arachnoid Granulations (Fig. 25). Along and within the 



Fig. 3. Sinuses in the base of the cranium, also meningeal arteries. 

 (After Morris's Anatomy.) 



a. Meningeal branch of anterior ethmoidal artery, b. Meningeal branch of posterior eth- 

 moidal artery, c. Middle meningeal artery, d. Ophthalmic division of fifth nerve, e. Third 

 nerve, f. Cavernous sinus, g. Fourth nerve, h. Auditory and facial nerves, i. Superior 

 petrosal sinus, j. Inferior petrosal sinus, k. Petro-squamosal sinus. 1. Accessory nerve. 

 m. Sigmoid part of transverse sinus, n. Posterior meningeal branch of vertebral artery. 

 o. Left marginal sinus, p. Left transverse sinus, q. Superior sagittal sinus, r. Circular 

 sinus, s. Carotid artery, t. Sixth nerve, u. Basilar artery, v. Basilar plexus of veins. 

 w. Auditory artery, x. Vertebral artery, y. Glossopharyngeal and vagus nerves, z. An- 

 terior spinal artery, aa. Hypoglossal nerve, bb. Accessory nerve, cc. Right marginal 

 sinus, dd. Occipital sinus, ee. Right transverse sinus. 



superior sagittal, the straight, the transverse, the petrosal and 

 the cavernous sinuses are the granulationes arachnoideales (Pac- 

 chionian bodies). These granulations are enlarged villi of the 



