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Cards In This Set
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What are the main parts to the nervous system?
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Brain and spinal cord - theres senory and motor signals
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Sheep brain- located meninges (sing meninix)
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- they cover adn protect the brain
- the dura mater - outermost layer, probly removed -arachnoid-middle meninx- thin and delicate bridges the sulci and covers many small blood vessels (not all brains will have this) -pia mater-inner layer-thin vascular membrane applied closely to the brain |
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Largest portion of the brain ?
raised parts of the brain? deep depression? shallow depressions? |
Cerebrum- surface folded ( two lobes )
outer part- cortex-gray matter raised part- gyri deep- fissures shallow- sulci |
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Longitudinal fissure
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Divided the two cerebral hemispheres -> saggital fissure
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Corpus callosum
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Connects the right and left hemispheres of the brain with nerve fibers
- transverse connections |
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Secondest largest part of the brain?
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Cerebellum- more folded than corex ( 1 lobe )
- myelinated nerve fibers leading to the cerebellar cortex can be seen as a white "tree-like" pattern known as arbor vitae. it controls skeletal, muscle contractions required for coordination, posture, balance and fine motor control |
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Brain stem
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Connects the cerebrum and cerebellum to the spinal cord
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Medulla oblongata
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Continous with the spinal cord ( most posterior )
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Olfactory bulb
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 - olfactory bulb and tracts - sense of smell , above the nasal cavity. olfactory nerves extending from the roof of the nasal cavity form synpases with nerons in the olfactory bulb. |
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Optic chiasma
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The white cross- posterior to the olfactory tracts. here some of the fobers from each optic nerve cross over to the opposite side of the cerebrum
The optic nerve in here (II) |
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Pituitary gland
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Connected to the main main body of the brain by the pituitary stalk, it lies posterior to the optic chiasma.
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Pons and medulla oblongata
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Connects parts and is a buldge in the brian, medulla ( posterior to the pons)
pons- relay center for impulses medulla oblongata- involved in the regualtion of heart rate, respiratory rate, and in other basal functions.  |
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Saggital section: cerebral cortex
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- sensroy areas which interupt senory impulses, motors areas determine muscular movements, emotional and intellectual thought
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Thalamus- saggital
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"central sorting area"- recives senory impulses and relays them to approperiate regions of the brain.
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Pineal gland
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- small mass of tissue connected to the thalamus - it secretes the hormone melatonin in response too chanign day length.
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