. Diseases of the nervous system : for the general practitioner and student. cess between the cere-brum and cerebellum. The two layers of the dura become separated in certain places to formvenous sinuses. They are fifteen in number—five paired and five single. THE CENTRAL NERVOUS SYSTEM 45 The paired ones are two lateral, two superior petrosals and two inferiorpetrosals, two cavernous and two occipitals. The single sinuses are thesuperior longitudinal, inferior longitudinal, the straight, the circular andthe transverse. The accompanying illustrations give a satisfactory idea of their re-specti
. Diseases of the nervous system : for the general practitioner and student. cess between the cere-brum and cerebellum. The two layers of the dura become separated in certain places to formvenous sinuses. They are fifteen in number—five paired and five single. THE CENTRAL NERVOUS SYSTEM 45 The paired ones are two lateral, two superior petrosals and two inferiorpetrosals, two cavernous and two occipitals. The single sinuses are thesuperior longitudinal, inferior longitudinal, the straight, the circular andthe transverse. The accompanying illustrations give a satisfactory idea of their re-spective seats (Figs. 41, 42 and 43). Arachnoid.—It is situated between the dura and pia. It envelops thebrain but does not penetrate the fissures. At the level of the fissures into 1MIXDIBULUM Internal carotid artery. CRISTA GALLI OPTIC NERVE Spheno-pariela! sinus Middle cerebral arteryAnterior cerebralartery Posterior communi-cating arteryCavernous sinus OPTIC TRACTTHIRD NERVECerebral peduncle Aqueduct of SylviusMESENCEPH-ALON Falx cerebri Tentorium cerebellStraight sinus. Superior cerebellar arteryPosterior cerebral arterySuperior petrosal sinus Free border of ten-torium boundingtentorial notch Transverse sinus Superior sagittal sinus Fig. 42.—Showing the Upper Surfaces of the Tentorium Cerebelli and the Ten-torial Notch through which the Mid-brain and Posterior Cerebral Arteries Enterthe Middle Fossa of the Cranium. (Morris Anatomy.) which the pia dips the two membranes are widely separated. This is thesub-arachnoid space containing cerebro-spinal fluid. On the vertex of the brain, along the longitudinal fissure, there aresmall nodules, outgrowths of the arachnoid, called Pacchionian bodies. Pia-mater.—It is an extremely thin and vascular membrane closely 46 THE CENTRAL NERVOUS SYSTEM applied to the cortex and continuing in the fissures. Together with theother two membranes it forms the sheaths of the cranial nerves. Special processes are sent off in the spaces between ce
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervous, bookyear1913
