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5d classification of nerve fibers (3.Physio-clinical classification (Has…
5d
classification of nerve fibers
1.Erlanger & Gasser's
classification
A
Typical myelinated fibers of
spinal motor nerves
(motor & sensory)
Beta
A beta
touch
pressure & motor functions
5-12
30-70
-
1 more item...
Gamma
A gamma
motor to muscle spindles
3-6
15-30
-
1 more item...
Delta
A delta
pain
temperature
crude touch
2-5
12-30
-
1 more item...
Alpha
Fiber type
A alpha
Function
proprioception
somatic motor golgi tendon organ
touch
Fiber diameter
12-20
Conduction velocity
mts/sec
70-120
Spike duration
0.4-0.5
1 more item...
B
Myelinated efferent
pregangionic
B
preganglionic autonomic
nerve fibers
Less than 3
3-15
1.2
1.2
C
Unmyelinate d
Dorsal root
pain
touch
temperature
conduct impulses generated by
cutaneous receptors
0.4-1.2
0.5-2
2
2
Sympathetic
poastganglionic sympathetic
fibers
0.3-1.3
0.7-2.3
2
2
2.numerical
classification
sometimes Used for sensory neurons
Is based on the origin of nerve fibers
Number
[roman numerals]
1a
Origin
muscle spindle
Fiber type
A alpha
1b
golgi tendon organ
A alpha
2
muscle spindle secondary ending
kinesthesia
touch
pressure
A beta
3
pain & temp receptors
crude touch
pressure receptors
A delta
4
pain touch
pressure
temperature
Dorsal root ‘C’ fibers
3.Physio-clinical
classification
Has clinical & physiological significance
Is based on sensitivity to
hypoxia
pressure &
anesthetic agents
Suseptability
sensitivity to hypoxia
Most susceptible
B
intermediate
A
least susceptible
C
sensitivity to pressure
A
B
C
sensitivity to 'local anaesthetics
C
B
A