Sensory Nerve Fiber Flashcards
Bundles of axons joined together that vary in thickness, myelination, conduction velocity, fidelity
Sensory Nerve Fiber
For temporal and spatial fidelity
TYPE A (TYPE I) thicker, more myelinated, faster
Less energy requiring
TYPE C (TYPE IV) thinner, unmyelinated, slower
Most susceptible to HYPOXIA
Type B
Most susceptible to PRESSURE
Type A
Most susceptible to LOCAL ANESTHETICS
Type C
large alpha motoneurons
largest diameter, fastest conduction velocity
A-alpha
Ia - muscle spindle afferents
Ib - golgi tendon organs
Touch, pressure
A- beta
II - secondary afferents of muscle spindles, touch and pressure
gamma motoneurons to muscle spindles (intrafusal fibers)
A-gamma
touch, pressure, temperature and FAST PAIN
A-delta
III - touch, pressure, fast pain and temperature
Preganglionic autonomic fibers
B
SLOW pain; postganglionic autonomic fibers
smallest diameter
slowest conduction velocity
C
IV - pain and temperature (unmyelinated)
sense of smell
sexual sensation, tickle, itch
