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PNS-Bio 5 sc

PNS-Bio 5 SC

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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