Nervous system
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| what ia a neuron | a nerve cell
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| What are axons and dendrites | Connections between adjacent cells
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| What is the main function of neuroglia | support, protect, defend, and aid in the repair of injury of neural tissue
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| If an axon is unsheathed it is call an | unmyelinated axon
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| a myelin sheath is manufactured by a form of nevous tissue called | schwann cells
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| What do the nodes of ranvier do | increase the speed of transmission of the impulse.
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| Bundles of myelinated nerves are referred to as | White matter
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| Between the nerve cells lies a gap referred to as | the synapse
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| describe the layout of the presynaptic terminal, synaptic cleft and postsynaptic terminal. | at the end of a nerve is the presynaptic terminal. The space between the neurons is the synaptic cleft. Opposite of the presynaptic terminal and across the synaptic cleft is the postsynaptic terminal.
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| chemicals released from the presynaptic terminal are called | neurotransmitters.
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| Groups of nerve cells are bundled together to form | nerve fibers
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| The CNS is comprised of what | the brain and spinal cord
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| the PNS is comprised of | nerves that extend fron the CNS to the peripheral structures outside the CNS
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| What is formed by the individuale vertebrae | the vetebral canal
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| ______ carry sensory information in the form of ______ ______ from the periphery back to the brain. | Ascending fibers (afferent tracts)Action potentials
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| _________ carry motor impulses from the brain to the fibers | Descending fibers(efferent tracts)
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| axillary nerve innervates what | arm abduction and lateral rotation
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| Radial nerve innervates what | extend the elbow, supinate the forearm, extend the wrist, fingers, and the thumb
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| musculocutaneous nerve innervates what | flexing of the shoulder and elbow
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| median nerve does what | supplies the pronator muscles of the forearm, and flexes the wrist, the fingers and the thumb.
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| the ulnar nerve innervates what | flexes the wrist, fingers, and abduct, and adduct the fingers and thumb
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| the lumbosacral supplies what extremity | the lower extremity
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| the obturator nerve does what | adducts the thigh and rotates it laterally
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| the femoral nerve does what | flex the hip, and extend the knee
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| the tibial nerve does what | extends the hip and flexes the knee. Planter flex the ankle, and flex the toes.
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| what two nerves combine to form the sciatica | tibial nerve, and the common peroneal.
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| How many pairs of cranial nerves rise from the base of the brain | 12
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| What does the olfactory nerve do | supplies sense of smell
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| What does the optic nerve do | provides sense of vision
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| What does the oculomotor nerve do | causes motion of the eyeball and upper lid
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| What does the trochlear nerve do | allows a downward gaze
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| What does the trigeminal nerve do | sensation of the scalp, forehead, face, and lower jaw
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| What does the abducent nerve do | lateral movement of the eye
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| What does the facial nerve do | Motor acvtivity to all muscles of facial expression
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| What does the vagus nerve do | provides motor function to the soft palate, pharynx, and larynx
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| What does the accessory nerve do | soft palate, pharynx, sternoclediomastoid muscle, and traps.
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| What does the hypoglossal nerve | tounge and throat
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| What is the sympathetic pathway responsible for | the body's response to shock and stress
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| What is the parasympathetic nervous system responsible for | relaxes the body
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| A neuron that secrets acetylcholine is a _____ fiber | cholinergic
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| A neuron that secrets norepinephrine is an ______ fiber | adrenergic
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| acetylcholine stimulates what receptors | muscarinic
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Created by:
klindley