Lecture 23: The PNS- Somatic Sensation Flashcards

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1
Q

Four parts of somatic sensation

A

Touch, temperature, nociception (pain + itch), proprioception

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2
Q

What is the area of somatosensory cortex devoted to a specific body area associated with?

A

Sensitivity

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3
Q

Plasticity

A

Amount of area for a specific body part can change in size

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4
Q

Places with thermoreceptors with free nerve endings

A

Skin, organs, muscles, CNS

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5
Q

Nociceptors

A

Respond to strong noxious stimuli

chemicals, mechanical damage, thermal extremes

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6
Q

Nociceptors are localized throughout the body except for what nervous system?

A

CNS

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7
Q

What is nociception felt as?

A

Pain or itch

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8
Q

Fast Pain

A

Pricking, sharp pain

Small myelinated axons (make it fast)

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9
Q

Slow Pain

A

Dull, achy

Small unmeyelinated axons (make it slow)

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10
Q

Itch

A

Linked to pain in that scratching and itch can reduce the perception of pain

Associated with rashes, MS, and diabetes for example

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11
Q

When is nociception increased?

A

Emotional experience

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12
Q

When is nociception inhibited?

A

Higher order functioning

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13
Q

Gate Control Theory

A

Stimulating mechanoreceptor fibers (rubbing the skin) inhibits other pathways, decreasing the sensation of pain

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14
Q

Kinesthesia

A

Body movement

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15
Q

What do different neurons encode?

A

Limb/ joint velocity, load, muscle length

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16
Q

When can proprioception and kinesthetic loss happen?

A

During adolescence, body weight fluctuations, when tired`