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PNS-Bio 5 sc
PNS-Bio 5 SC
| Question | Answer |
|---|---|
| Function of PNS | Provide communication between CNS and organs |
| Connective tissue covering nerves | 1)Endoneurium-covers myelinated axon 2)Perineurium- covers a fascicle 3)Epineurium- covers a collection of fascicle |
| types of peripheral nerves | 1)Sensory (afferent)- info is being sent in, accepting by CNS 2) Motor (efferent)- "exiting" info being sent out from CNS 3) Mixed- some sensory, some motor, differentiate into |
| types of Somatic nerve fibers | somatic efferent- ex. skeletal muscle somatic afferent- ex. touching skin |
| types of visceral nerve fibers | visceral efferent- ex. movement of visceral organ, increase in heart rate) visceral afferent- ex. pain in the visceral organ |
| How many cervical spinal nerves? | 8- C8 nerve exits below C7 vertebral -rest of nerves as numbered by which vertebrae they exit ABOVE except C8 |
| How many thoracic and lumbar spinal nerves? | 12 thoracic, 5 lumbar. Are number by which vertebra they exit BELOW |
| D & V nerves form... | Spinal nerve |
| Plexuses (where are they found) | interlacing networks of nerves, found in cervical, brachial, lumbar and sacral regions |
| What is the importance of the branch of a plexus? | each contains fibers from several different spinal nerves so if a spinal nerve gets damaged, muscle will not be paralyzed |
| What nerves form the cervical plexus? | C1-C5; innervates skin of the neck, ear, back of head and shoulders. |
| Phrenic nerve | of the cervical plexus, C3-C5 ;"C3, C4, C5 keeps the diaphragm alive" |
| What nerves from the brachial plexus? | C5-C8, T1; innervate the upper limb |
| Major nerves of the brachial plexus? | Musculocutaneous, median, axillary, ulnar and radial |
| What forms the lumbar plexus? | L1-L4; innervates the thigh, abdominal wall and psoas muscle |
| Major nerves of the lumbar plexus | femoral and obturator nerve |
| What nerves form the sacral plexus? | L4-S4; innervates glutes, lower limb, pelvic structures, and perineum |
| Major nerve of the sacral plexus? | Sciatic, longest and thickest nerve of the body. Splits into tibial and common fibular nerve. |
| what is a reflex? | a rapid predictable motor response to a stimulus |
| 5 main components of spinal reflexes? | 1)receptor- nerve ending of sensory neuron;responds to change 2)Sensory neuron- carries info to CNs 3)Integration Center-CNs; receive, translate and make decision 4)Motor neuron: transmits impulses away from CNS 5) Effector: muscle or gland |
| Innate reflexes | genetically determine |
| acquired reflexes | learned |
| Spinal reflexes | processing in the spinal chord |
| cranial reflexes | processing in the brain |
| Somatic reflexes | control skeletal muscle contractions, include superficial and stretch reflexes |
| visceral (autonomic) reflexes | control actions of smooth and cardia muscles, glands |
| monosynaptic reflexes | one synapse |
| polysynaptic reflexes | multiple synapses |
Created by:
holt.gracea
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