Autonomic Nervous System and Pathologies of the Nervous System

Autonomic Nervous System Sensory and Motor Fibers

• The Autonomic Nervous System (ANS) consists of sensory and motor fibers.

Somatic Sensory Fibers

• Small Somatic Sensory Fibers:
  • Function: Responsible for pain perception and small touch sensations.
  • Characteristics:
    • Diameter: Medium
    • Myelination: Lightly myelinated
    • Speed of Conduction:
    • Maximum speed is up to $15 ext{ m/s}$ (approximately $40 ext{ mph}$)

Group C Fibers

• Description:
  • Shares the same characteristics as Group B fibers.
• Characteristics:
  • Diameter: Small
  • Myelination: Unmyelinated
  • Conduction:
    • Type of conduction: No salutatory conduction
    • Speed of Conduction:
    • Maximum speed is $1 ext{ m/s}$ (approximately $2 ext{ mph}$)

Clinical Relevance

• Pathologies of the Nervous System:
  • Example: Multiple Sclerosis
    • Introduction:
    • Multiple Sclerosis (MS) is an autoimmune disease that affects the central nervous system.
    • Impact on Nerve Fibers:
    • Results in the damage to myelin, affecting the conduction speed of nerve impulses.