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Axon


LENGTH

Axonal length is variable and ranges from a millimeter up to a meter or even longer. A bundle of axons forms a nerve fibre.

STRUCTURE

TYPES OF AXONS

On the basis of presence and absence of myelin sheath and the diameter of axon, it can be divided into several types:

  •     Type Aα: Diameter 13-20μm and is myelinated having conduction velocity 80 to 120m/sec.
  •     Type Aβ: Diameter 6-12μm and is myelinated having conduction velocity 33 to 75m/sec.
  •     Type Αγ: Diameter 5-8μm and is myelinated having conduction velocity 4 to 24m/sec.
  •     Type Aδ: Diameter 1-5μm and is thin myelinated having conduction velocity 3 to 30m/sec.
  •     Type B: Diameter 1-5μm and is myelinated having conduction velocity 3 to 15m/sec.
  •     Type C: Diameter 0.2-1.5μm and is unmyelinated having conduction velocity 0.52m/sec.

FUNCTIONS OF AXON

Axon conduct electrical impulses to

  •     Muscle fibers
  •     Golgi tendon organs
  •     Cutaneous mechanoreceptors in skin
  •     Free nerve endings of touch, pressure and temperature
  •     Preganglionic and postganglionic fibres of autonomic nervous system

 



LENGTH

Axonal length is variable and ranges from a millimeter up to a meter or even longer. A bundle of axons forms a nerve fibre.

STRUCTURE

TYPES OF AXONS

On the basis of presence and absence of myelin sheath and the diameter of axon, it can be divided into several types:

  •     Type Aα: Diameter 13-20μm and is myelinated having conduction velocity 80 to 120m/sec.
  •     Type Aβ: Diameter 6-12μm and is myelinated having conduction velocity 33 to 75m/sec.
  •     Type Αγ: Diameter 5-8μm and is myelinated having conduction velocity 4 to 24m/sec.
  •     Type Aδ: Diameter 1-5μm and is thin myelinated having conduction velocity 3 to 30m/sec.
  •     Type B: Diameter 1-5μm and is myelinated having conduction velocity 3 to 15m/sec.
  •     Type C: Diameter 0.2-1.5μm and is unmyelinated having conduction velocity 0.52m/sec.

FUNCTIONS OF AXON

Axon conduct electrical impulses to

  •     Muscle fibers
  •     Golgi tendon organs
  •     Cutaneous mechanoreceptors in skin
  •     Free nerve endings of touch, pressure and temperature
  •     Preganglionic and postganglionic fibres of autonomic nervous system

 

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