CHAPTER 14 THE PERIPHERAL NERVOUS SYSTEM

peripheral nervous system

general visceral motor port of the PNS is the autonomic nervous system (ANS)

• ANS has 2 divisions - parasympathetic and sympathetic

exteroceptors

sensitive to stimuli arising from outside the body

at or near body surfaces: receptos for touch, pressure, pain, and temperature

interoceptors

receive stimuli from internal viscera

• monitor changes in chemical concentration, taste stimuli, stretching of tissues, and temperature

proprioceptors (interoceptor)

located in skeletal muscles, tendons, joints and ligaments, monitor degree of stretch

mechanoreceptors (exteroceptor)

touch, pressure, stretch, vibration, itch

thermoreceptor (exteroceptors)

respond to temperature changes

chemoreceptors (interoceptors)

respond to chemicals in solution

photoreceptors (exteroreceptors)

respond to light; located in light

nociceptors (interoceptors)

respond to harmful stimuli that result in pain (respond to tissue damage)