Flashcards in Nerve Fibers Deck (15):
What is the axon classification based on size called?
Erlanger - Gasser
What is the name of the classification system for sensory root nerves?
Llyod - Hunt
What is thel diameter and speed of conduction of an A-alpha fiber?
Diameter: 13 - 20 um
Speed: 80 - 120 m/sec
What is the diameter and speed of conduction of an A-beta fiber?
Diameter: 6 - 12 um
Speed: 35 - 75 m/sec
What is the diameter and speed of conduction of an A-delta fiber?
Diameter: 1 - 5 um
Speed: 5 - 30 m/sec
What is the diameter and speed of conduction of a C fiber?
Diameter: 0.2 - 0.05 um
Speed: 0.5 - 2 m/sec
What do A-alpha fibers innervate?
- Extrafusal muscle
What do A-beta fibers innervate?
- Extrafusal and intrafusal muscle fibers
What do A-gamma fibers innervate?
- Intrafusal muscle fibers
What do B and C fibers innervate?
- Preganglionic and post ganglionic fibers
What do Ia fibers innervate?
- Primary afferent of muscle spindles
What do Ib fibers innervate?
- Golgi tendon organs
What do II fibers innervate?
- Secondary afferents of muscles spindles
- Touch and pressure receptors
- Pacinian corpuscles (vibration)
What do III fibers innervate?
Small, lightly myelinated fibers for:
- Touch and pressure