Operative surgery, for students and practitioners . latter layer is intimately adherent to the sur- BRAIN. 65 face of the brain, it clips down into all the sulci between the con-volutions, and a process is projected forward into the transverse fis-sure of the brain as the velum interpositum, between tlie body of thefornix above and epithelial roof of the third ventricle below. Thevenae Galeni emerge posteriorly from between the two layers of thevelum interpositum, where they join to form the vena magna Galeni^which is continued into the straight sinus. The pia accompaniesthe small vessels that
Operative surgery, for students and practitioners . latter layer is intimately adherent to the sur- BRAIN. 65 face of the brain, it clips down into all the sulci between the con-volutions, and a process is projected forward into the transverse fis-sure of the brain as the velum interpositum, between tlie body of thefornix above and epithelial roof of the third ventricle below. Thevenae Galeni emerge posteriorly from between the two layers of thevelum interpositum, where they join to form the vena magna Galeni^which is continued into the straight sinus. The pia accompaniesthe small vessels that enter the cortex for a short distance and itcannot be detached from the surface of the brain without causingsmall lacerations and hemorrhages corresponding to the points where SkinSubcutaneous connective tissueAponeurosis occip. front, muscle —-L,ayer of loose connective tissue ^^fiPericranium ^i^i BoneDura materSubtlural space ^^ .Pia-araehnoid membrane (ariich- ^^ fnoid aud pia mater proper.) l|Gray matter X White matterPB, Pacchionian bodies. Falx cerebriFig. 39.—Section through Scalp, SkuU, Brain, etc. the blood-vessels penetrate. The space between the two layers of thepia mater, between the arachnoid and the pia mater layer proper,is called the subarachnoid space. It contains the cerebro-spinal fluidand supports the blood-vessels that supply the brain. These vesselsramify in the subarachnoid space, between the two layers of the piamater, between the arachnoid la^^r and the pia mater proper. The subarachnoid space is not a free space, but is broken upinto a number of cellular spaces by a system of trabecuhp that extendbetween the two layers. All these spaces communicate freely withone another aud ?uith the ventricular system through several well-defined openings in the tela choroidea. Three of these openings arefound in the membranous roof of the fourth ventricle: one, theforamen of Majendi. in the middle line near the lower angle, and twoothers, one in each lateral re
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