Spinal Nerve Fibers: Types and Functions - A Comprehensive Guide
Sensory fibers:
- Somatic afferent fibers: Transmit sensory information from the skin, muscles, joints, and tendons to the central nervous system. These include:
- Mechanoreceptors: Respond to touch, pressure, and vibration.
- Thermoreceptors: Respond to changes in temperature.
- Nociceptors: Respond to painful stimuli.
- Visceral afferent fibers: Transmit sensory information from the internal organs to the central nervous system.
Motor fibers:
- Somatic efferent fibers: Transmit motor commands from the central nervous system to the skeletal muscles. These include:
- Alpha motor neurons: Innervate extrafusal muscle fibers, which are responsible for generating muscle contraction.
- Gamma motor neurons: Innervate intrafusal muscle fibers, which are responsible for regulating muscle tone.
- Visceral efferent fibers: Transmit motor commands from the central nervous system to the smooth muscles, cardiac muscle, and glands.
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