PSY 3110 Chapter Notes - Chapter 7: Somatic Nervous System, Peripheral Nervous System, Nociception

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Understanding Pain
Intro:
Pain is necessary for life. If we can't feel pain, we can't tell when we have an injury
Congenital Insensitivity to Pain: people who cannot feel pain. Die relatively young.
PAIN AND THE NERVOUS SYSTEM:
All sensory information, including pain, beings with sense receptors on or near the
surface of the body.
Neural impulses that originate in the skin and muscles are part of the peripheral nervous
system.
The Somatosensory System:
Def: conveys sensory information from the body to the brain.
All the PNS neurons from the skin's surface and muscles are part of the somatic nervous
system.
Afferent Neurons
Three types of neurons:
o 1- afferent: sensory, relay info. From the sense organs toward the brain.
o 2- efferent: motor, result in the movement of muscles or the stimulation of
organs or glands.
o 3- interneurons: connect sensory to motor neurons.
Primary Afferents: contain afferent neurons, have specialized receptors that convert
physical energy into neural impluses, which travel to the spinal cord and then to the
brain, where that info is processed and interpreted.
Involvement in Pain
Nociception: refers to the process of receiving pain.
Nociceptors: in the skin and organs.
Some neurons that convey sensory information are covered with Myelin, a fatty
substance that acts as insulation.
The Spinal Cord
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