The Brain and Cranial Nerves

The Brain and Cranial Nerves - The Brain and Cranial Nerves...

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I. General Organization of Brain A. Brain Stem 1. medulla oblongata 2. pons 3. midbrain (mesencephalon) B. Diencephalon 1. thalamus 2. hypothalamus C. Cerebrum D. Cerebellum II. Specialized Parts of the Brain A. Meninges 1. dura mater - outer layer, very tough 2. arachnoid - middle layer 3. pia mater - innermost layer, adheres to brain itself B. Ventricles - Cavities in the Brain 1. lateral - (2) in each hemisphere 2. third - in slit between thalamic halves 3. fourth - between brain stem and cerebellum i. Foramen of Monro - lateral -> 3rd ii. cerebral aqueduct - 3rd -> 4th C. Cerebrospinal Fluid 1. liquid of about 80-150 ml 2. flows around brain and through the ventricles 3. choroid plexuses - formation of CSF D. Special Properties of Brain Tissue 1. brain uses 20% of oxygen (only 3 pounds!) 2. brain uses 30-35% of glucose 3. blood- brain barrier - i. network between capillaries and neuroglia ii. only very select molecules get in
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The Brain and Cranial Nerves - The Brain and Cranial Nerves...

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