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A & P Ch8
Nervous system
| Question | Answer |
|---|---|
| what ia a neuron | a nerve cell |
| What are axons and dendrites | Connections between adjacent cells |
| What is the main function of neuroglia | support, protect, defend, and aid in the repair of injury of neural tissue |
| If an axon is unsheathed it is call an | unmyelinated axon |
| a myelin sheath is manufactured by a form of nevous tissue called | schwann cells |
| What do the nodes of ranvier do | increase the speed of transmission of the impulse. |
| Bundles of myelinated nerves are referred to as | White matter |
| Between the nerve cells lies a gap referred to as | the synapse |
| 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. |
| chemicals released from the presynaptic terminal are called | neurotransmitters. |
| Groups of nerve cells are bundled together to form | nerve fibers |
| The CNS is comprised of what | the brain and spinal cord |
| the PNS is comprised of | nerves that extend fron the CNS to the peripheral structures outside the CNS |
| What is formed by the individuale vertebrae | the vetebral canal |
| ______ carry sensory information in the form of ______ ______ from the periphery back to the brain. | Ascending fibers (afferent tracts)Action potentials |
| _________ carry motor impulses from the brain to the fibers | Descending fibers(efferent tracts) |
| axillary nerve innervates what | arm abduction and lateral rotation |
| Radial nerve innervates what | extend the elbow, supinate the forearm, extend the wrist, fingers, and the thumb |
| musculocutaneous nerve innervates what | flexing of the shoulder and elbow |
| median nerve does what | supplies the pronator muscles of the forearm, and flexes the wrist, the fingers and the thumb. |
| the ulnar nerve innervates what | flexes the wrist, fingers, and abduct, and adduct the fingers and thumb |
| the lumbosacral supplies what extremity | the lower extremity |
| the obturator nerve does what | adducts the thigh and rotates it laterally |
| the femoral nerve does what | flex the hip, and extend the knee |
| the tibial nerve does what | extends the hip and flexes the knee. Planter flex the ankle, and flex the toes. |
| what two nerves combine to form the sciatica | tibial nerve, and the common peroneal. |
| How many pairs of cranial nerves rise from the base of the brain | 12 |
| What does the olfactory nerve do | supplies sense of smell |
| What does the optic nerve do | provides sense of vision |
| What does the oculomotor nerve do | causes motion of the eyeball and upper lid |
| What does the trochlear nerve do | allows a downward gaze |
| What does the trigeminal nerve do | sensation of the scalp, forehead, face, and lower jaw |
| What does the abducent nerve do | lateral movement of the eye |
| What does the facial nerve do | Motor acvtivity to all muscles of facial expression |
| What does the vagus nerve do | provides motor function to the soft palate, pharynx, and larynx |
| What does the accessory nerve do | soft palate, pharynx, sternoclediomastoid muscle, and traps. |
| What does the hypoglossal nerve | tounge and throat |
| What is the sympathetic pathway responsible for | the body's response to shock and stress |
| What is the parasympathetic nervous system responsible for | relaxes the body |
| A neuron that secrets acetylcholine is a _____ fiber | cholinergic |
| A neuron that secrets norepinephrine is an ______ fiber | adrenergic |
| acetylcholine stimulates what receptors | muscarinic |
Created by:
klindley