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BMS 301 (47)

Cranial meninges, venous sinuses

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Biomedical Science
BMS 301
Mark Frasier

17 October 100 mL of blood to brain per minute Arterial blood → brain tissue → veins → venous sinuses → internal jugular vein Arterial blood → choroid plexus → CSF → sub arachnoid space → venous sinuses → internal jugular vein Cranial meninges Pia mater Arachnoid Dura mater – 2 layers: outer (attached to bone of cranial vault, periosteal layer) and inner (meningeal layer), fused together in most places Inner layer infolds on itself (compartmentalizes brain) There is no epidural space Space exists between inner and outer dura at infoldings – venous sinus Create venous pathway that will not collapse No valves Dural infoldings Falx cerebri Separates left and right cerebral hemispheres Runs down to superior aspect of corpus callosum Falx cerebelli Separates left and right cerebellar hemispheres Tentorium cerebelli Separates ce
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