Module 4 Flashcards
brain + spinal cord
CNS
12 pairs cranial nerves + 31 pairs spinal nerves
PNS
afferent is associated with what type of function
sensory
efferent is associated with what type of function
motor
somatic nerve system controls what type of function
voluntary
autonomic nerve system controls what type of function
involuntary
what are the divisions of the autonomic nervous system
- sympathetic
- parasympathetic
what does the sympathetic nervous system control
fight or flight
what does the parasympathetic nervous system control
rest and digest
what are the 3 functions of neurons
- receive information
- process information
- send response
what are the structural components of a neuron
- cell body
- 1 axon
- 1 + dendrites
what does the axon of a neuron do
carries impulses away FROM the cell body
what do the dendrites of a neuron do
carries impulses TO the cell body
what is the terminal end of the axon that allows an impulse to travel to another axon via neurotransmitters
synaptic knob
what are the components of a nerve
- many axons
- an artery
- a vein
what is the connective tissue around an axon
endoneurium
what is a group of axons
fascicle
what is the connective tissue around one fascicle
perineurium
what is the connective tissue around a group of fascicles
epineurium
what are the structural components of a nerve
- endoneurium
- fascicle
- perineurium
- epineurium
what can increase the speed of conduction of a nerve
myelination & the nodes of Ranvier
what are the largest fiber types
Type A
what fiber type has the fastest impulse conduction
type A
what subtype of fiber is the largest, fastest efferent nerve involved in muscle movement
type A - alpha
what subtype of fiber is afferent and involved in proprioception, touch, and pressure
type A - beta
what subtype of fiber is efferent and involved in muscle tone
type A - gamma
what subtype of fiber is afferent and involved in pain and temperature
type A - delta
Are type A fibers afferent or efferent
either afferent or efferent
are type B fibers afferent or efferent
efferent
what fiber type is slightly myelinated
type B
what fiber type is involved in preganglionic ANS and vascular smooth muscle control
type B
what fiber type is myelinated
type A
what fiber type is unmyelinated
type C