chp 15 - Chapter 15 Brain and cranial nerves Brain 100...

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Chapter 15 Brain and cranial nerves
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Brain 100 billion neurons 50 trillion neuroglial cells ~ 1.3 kg (3 lbs) – adult Connected to body via spinal cord 12 pairs of cranial nerves
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Protection of brain Skin/hair cranium (skull) Meninges Same 3 layers as spinal cord CSF in subarachnoid space
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Ventricles and CSF 4 chambers within brain 2 lateral ventrical third ventrical forth ventricle Walls of ventricles contain capillary beds choroid plexus
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Ventricles and CSF Ependymal cells cover caps of c. p. Plasma from blood ependymal cells Modified into CSF into ventricles
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Movement of CSF Continuous flow : vent. central canal subarachnoid space vent. Some CSF absorbed back into bloodstream w/in subar. space in brain
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Regions of brain
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Cerebrum Center for complex tasks Intelligence, reading, writing, learning Sensory - vision, hearing, speech motor control of skeleton muscles
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chp 15 - Chapter 15 Brain and cranial nerves Brain 100...

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