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Chapter 10 _Brain and Cranial Nerves

Chapter 10 _Brain and Cranial Nerves - The Brain Divided...

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1 Chapter 10: The Brain & Cranial Nerves The Brain Divided into 4 distinct areas: Cerebral hemispheres (Cerebrum) Diencephalon Brain Stem Cerebellum Protected by the: Skull Meninges CSF Blood-brain barrier Protective Structures of the CNS: The Meninges The Meninges Dura Mater : double-layered cartilaginous membrane Periosteal layer : attached to surface of the skull Meningeal layer: outer covering of the brain Dural Sinuses/Venous channels : separations between the 2 layers in which blood from nervous tissue is drained The Meninges Arachnoid: middle Layer Loosely attached to the pia mater by web-like fibers Provides a space for the movement of CSF between the 2 membranes Pia Mater: innermost layer Attached to the brain & spinal cord Carries the brain’s blood supply Protective Structures of the CNS: Cerebrospinal Fluid (CSF) Clear liquid circulating around the brain & spinal cord Functions: Protects the CNS Cushions shocks Carries nutrients to cells Transports waste products from cells Drains into the subarachnoid space returned to blood circulation via the arachnoid villi
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