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Anatomy & Physiology > Somatosensory System I > Flashcards

Somatosensory System I Flashcards

1
Q

Exteroception

A

External stimuli

Touch, temperature, pain

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2
Q

Function of mechanical receptors?

A

Respond to mechanical stimulation

Located in skin

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3
Q

Function of thermal receptors?

Located in skin

A

Respond to temperature changes

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4
Q

Function of chemical receptors?

A

Respond to chemical stimuli

Located near organs

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5
Q

Interoception

A

Internal stimuli about organ function

Hunger, thirst, breathlessness

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6
Q

Proprioception

A

Awareness of body position/movement in space

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7
Q

Location of mechanical receptors?

A

Near skeletal muscle, joint capsules, skin

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8
Q

First-order neuron

A

Neuron with cell body in dorsal root ganglion of spine

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9
Q

Second-order neuron

A

Neuron with cell body in spinal cord or brainstem

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10
Q

Function of thalamus?

A

Relay station for sensory information

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11
Q

Third-order neuron

A

Neuron with cell body in thalamus

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12
Q

Function of dorsal root ganglion neurons?

A

Transduction and transmission of somatosensory information

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13
Q

Transduction

A

Process of converting physical stimuli into electrical signals

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14
Q

Transmission

A

Process of sending electrical signals through neurons

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15
Q

What do peripheral branches innervate?

A

Touch mechanoreceptors

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16
Q

Where does the Central branch synapse onto?

A

Second-order neuron in spinal cord or brainstem

17
Q

Function of proprioceptors

A

Provide awareness of body position

18
Q

Function of nociceptors

A

Respond to pain

19
Q

Thermoreceptors

A

Respond to temperature changes

20
Q

Function of mechanoreceptors?

A

Respond to mechanical stimulation

21
Q

Group I/Aa fibers

A

Proprioceptors in muscles

22
Q

Group II/Ab fibers

A

Touch receptors in skin

23
Q

Group III/Ac fibers

A

Pain and temperature receptors

24
Q

Group IV/C fibers

A

Temperature, pain, and itch receptors

25
Q

True or False?

All 4 types of touch receptors conduct at the same
speed.

A

True

(at Ab)

26
Q

Function of SA1 (Merkel cells/disk) touch receptors

A
  • Respond to light touch, edges, corners, points
  • Detect form, texture, curvature (crude touch information)
27
Q

Function of SA2 (Ruffini endings) touch receptors?

A
  • Respond to stretching of skin
  • Detect stretching, hand shape, motion direction
28
Q

Function of RA1 (Meissner corpuscle) touch receptors?

A
  • Respond to large movements, vibration (fine touch information)
  • Detect motion, grip control
29
Q

Function of RA2/PC (Pacinian corpuscle) touch receptors?

A
  • Respond to small movements (vibration)
  • Detect vibrations in skin when using tools (pencils, keys, etc.)
30
Q

Mechanoreceptor transduction

A
  • Physically deforms cell membrane, stretching out receptors
  • Allows cations in to depolarize cell
31
Q

True or False?

The firing rate in mechanoreceptor transmission corresponds to SA/RA designation.

32
Q

True or False?

The trigeminal nerve (V) enters the CNS via the spinal cord.

A

False

It enters the CNS via the pons.

33
Q

Location of cell body of Principal/Main sensory nucleus

A

Trigeminal ganglia mid-pons

34
Q

Location of Spinal nucleus

A

Trigeminal ganglia in medulla/lower pons (elongated)

35
Q

Parts of Trigeminal Nuclei:

A
  • Principal/Main sensory nucleus
  • Spinal nucleus
  • Motor nucleus
36
Q

Where do secondary fibers decussate and travel up in the trigeminothalamic tract to?

A

The ventral posteromedial nucleus (VPM) of thalamus

37
Q

What does the principal/main sensory nucleus represent?

A

Pressure and vibration

38
Q

What does the spinal nucleus represent?

A

Mechanosensation, pain, temperature

Anatomy & Physiology (12 decks)

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