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Brain and Cranial Nerves.docx - Brain and Cranial Nerves...

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Brain and Cranial NervesBrain: Part of CNS contained in cranial cavity-Brainstem: connects spinal cord to brain; integration of reflexes necessary for survival-Cerebellum: involved in control of locomotion, balance, posture-Diencephalon: thalamus, epithalamus, hypothalamus -Cerebrum: conscious thought, control, reasoning, higher order brain functionProtection-Cranial bones:cavity surrounded by eight bones cometogether to make up the braincase-Cranialmeninges: connective tissue sacs outside ofthe brain in between the bones and the brainoPia, arachnoid, and dura mater (composed of two layers)-Cerebrospinal fluid: fluid that circulates around and inside the brain and provides a level of shock absorption Function-Periosteal layer:thickest layer, stuck on the bone, lines the inside of the cranial case-Meningeal layer: dense irregular connective tissue, very tight with the periosteal layer-Falx Cerebri: anchors your brain to the brain case-The triangular space: Dural vensus sinusoSinus: pooling of the blood outside of the veinoThe blood returning from the body tissue dumps into this spaceoCollect venus blood
-Arachnoid mater: adheres to the meningeal layeroHas collagen and elastic fibersoConnection between the fluid and the blood supply-Pia Mater: thin layer of connective tissueoStuck on every dent in the brain-Subarachnoid space: contains cerebral spinal fluidoSurrounds the entire brainVentricles-Ventricles of the brain hold cerebral spinal fluid on the inside of the brain-Two large cavities (blue) empty area is where majority of cerebral spinal fluid is formed. 1.From these ventricles the fluid will move through the brain to the spinal cord2.The first place it moves is to the interventricular foramen3.The into the third ventricle, which surrounds the diapshlon 4.From the third ventricle, it moves towards the brain stem5.Reaches the cerebral aqueduct and moves through the midbrain6.Moves down to the area where the cerebellum, pons and medulla oblongata meet and there is a cavity inside known as the fourth ventricle7.In the fourth ventricle, there is an opening to the subarachnoid space, which has cerebral fluid8.Lateral aperture: two holes off the fourth ventricle that dump the fluid into the subarachnoid space9.Medium aperture: connects to a hole that goes into the subarachnoid space10.The rest of fluid moves down the spinal cord through another opening in the spinal cord known as the central canalCerebrospinal Fluid (CSF)-Serum-like fluid lacking proteins, but containing nutrients. Fluid part of the blood without clotting factors-Plasma: fluid part of the blood with clotting factors-Bathes and protects the brain and spinal cord-Most-synthesized in the choroid plexus- lateral ventricles-Creates optimal environment for sending nervous signals-Ventricles are lined with ependymal cells

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Term
Fall
Professor
Dey

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