front 1 peripheral nerves | back 1 the brain, the spinal cord and the peripheral nervous system work together as a communication system. |
front 2 spinal cord | back 2 continuation of the brain stem 17 inches long and extends from the foremen magnum to the level of the first lumbar vertebrae |
front 3 gray matter | back 3 central- canal- opening or hold that extends the entire length of the spinal cord |
front 4 white matter | back 4 composed primarily of myelinated axons |
front 5 asending tracts | back 5 carry information from the periphery, up the spinal cord and toward the brain (a sensory tract) |
front 6 depending tract | back 6 carries information from the brain, down the spinal cord, and toward the periphery (motor tracts) |
front 7 decussation | back 7 the crossing over from one side to the other |
front 8 the spinal cord serves three main functions | back 8 sensory pathway, motor pathway, and reflex center |
front 9 motor pathway | back 9 spinal cord provides a pathway for information coming from the brain and going to the periphery |
front 10 reflex center | back 10 the spinal acts as a major reflex center. involuntary response to a stimulus |
front 11 patellar or knee jerk reflex | back 11 in response to a tap on you're kneecap , your lower leg quickly and involuntarily pops up |
front 12 pupillary reflex | back 12 regulates the amount of light that enters the eye |
front 13 baroreceptor reflex | back 13 when blood pressure changes, these reflexes cause the heart and blood vessels to respond in a way that restores blood pressure to normal |
front 14 peripheral nervous system nerves | back 14
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front 15 cranial nerve: Olfactory | back 15 a sensory nerve that carries information from the nose to the brain concerned with the sense of smell |
front 16 cranial nerve: II optic nerve | back 16 sensory nerve that carries visual information from the eye to the brain |
front 17 cranial nerve: III oculomotor | back 17 primarily a motor nerve that causes contraction of the extrinsic eye muscles, thereby moving the eyeball in the socket |
front 18 cranial nerve: IV trochlear | back 18 primarily a motor nerve that innervates one of the extrinsic muscles of the eyeball, helps move the eyeball |
front 19 cranial nerve: V trigeminal | back 19 carry information regarding touch, pressure and pain from the face, scalp, eye and teeth to the brain |
front 20 cranial nerve: VI abducens | back 20 primarily a motor nerve, controls eye movement by innervating only one of the extrinsic eye muscles |
front 21 cranial nerve: VII facial | back 21 the nerve of facial expressions that allows us to smile, frown and make other faces |
front 22 cranial nevre: vestibulocohlear | back 22 carries information for hearing and balance from the inner ear to the brain |
front 23 cranial nerve: IX glossopharyngeal | back 23 carries taste sensations from the posterior tongue to the brain associated with gag reflex |
front 24 cranial nerve: X vagus | back 24 a mixed nerve that innervates the tongue, pharynx, larynx, and many organs in the thoracic and abdominal cavities |
front 25 cranial nerve: XI accessory | back 25 primarily a motor nerve that supplies the sternocleidomastoid and the trapezius muscles |
front 26 cranial nerve: XII hypoglossal | back 26 primarily a motor nerve that controls movement of the tongue |
front 27 31 Pais of spinal nerves emerge from the spinal cord and they are: | back 27
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front 28 plexuses | back 28 points where nerve fibers converge together |
front 29 three major nerve plexuses | back 29
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