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Neuro 2020 > Sensory 11/3/16 > Flashcards

Sensory 11/3/16 Flashcards

1
Q

What system deals with the cutaneous sensation?

A

-Dorsal column system

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2
Q

What three general sensations deal with the anterior lateral system?

A
  • Crude touch
  • Temperature
  • Pain
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3
Q

What three general sensations deal with the dorsal column-Medial lemniscus?

A
  • Proprioception
  • Vibration
  • Fine touch
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4
Q

Where do sensory pathways start?

A

-Sensory receptors

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5
Q

T/F

The primary sensory neuron is a pusedo-unipolar neuron?

A

-True

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6
Q

In the primary sensory neuron what are the two branches?

A
  • Central

- Peripheral

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7
Q

What is another name for the primary sensory neuron cell bodies?

A

-Dorsal root ganglia

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8
Q

T/F

The peripheral branch of the primary sensory neuron goes to the spinal cord

A

False

-It goes to the periphery (skin)

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9
Q

T/F

-Sensory receptors are specialized to detect different types of inputs such as fine touch, vibration, and pressure.

A

True

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10
Q

What type of nerve endings detect pain, temperature, itch (ALS pathway)?

A

Free nerve endings

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11
Q

What type of receptors detect mechanical inputs?

A

-Mechanoreceptors

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12
Q

What type of receptors detect muscle stretch, tension, and joint position?

A

-Proprioceptors

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13
Q

T/F

Muscles give sensory feedback that helps drive the motor system

A

True

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14
Q

What does the speed of conduction depend upon?

A
  • Axon diameter

- Degree of myelination

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15
Q

What will the neuron look like if it has a fast speed of conduction.

A
  • It will be large

- It will have lots of myelin

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16
Q

What part of the body has the quickest speed of conduction for sensory nerves?

A

-Proprioceptors of skeletal muscle

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17
Q

What travels faster through the neuron, the proprioceptors of skeletal muscle or the mechanoreceptors of skin?

A

-Proprioceptors of skeletal muscle

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18
Q

What pathway are proprioceptors of skeletal muscles and mechanoreceptors of skin a part of?

A

-DCML pathway

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19
Q

What is the receptive field?

A

-Area detected by a single receptor neuron

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20
Q

What are the ascending branches in the spinal cord?

A

-Sensory pathways to higher centers

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21
Q

What are descending pathways in the spinal cord?

A

-Motor pathways from higher centers

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22
Q

How many neurons are involved in the sensory pathway?

A

Three

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23
Q

What are the cell bodies for the 1st order neuron in the DCML?

A

-Dorsal root ganglion

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24
Q

What are the cell bodies for the DCML 2nd order neuron?

A

-Gracile/cuneate nuclei (Medulla)

25
What are the cell bodies for the 3rd order neurons?
-VPL nucleus (thalamus)
26
What are the two major divisions of the dorsal column?
- Medial tract (gracile tract) | - Lateral tract (cuneate tract)
27
What part of the body does the medial (gracile) tract carry sensory information from?
-T6 and below (lower body)
28
What part of the body does the lateral (cuneate) tract carry sensory information from?
-T6 and above (upper body)
29
Where does the first synapse occur in the DCML sensory pathway?
-Caudal Medulla in the Dorsal column nuclei
30
What are the two nuclei in the dorsal column nuclei?
- Gracile nucleus | - Cuneate nucleus
31
T/F | The first synapse is contralateral in the DCML
False | It is ipsilateral
32
Where do axons from the second order neuron in the DCML pathway decussate?
-Internal arcuate
33
After second order neurons decussate in the DCML pathway what do they ascend through?
-Medial lemniscus
34
If you obliterate the medial lemniscus what side of the body do you lose sensory from?
-The contralateral side
35
Where does the second synapse in the sensory systems occur?
-VPL of the thalamus
36
Where do third order neurons ascend to?
-Primary sensory cortex
37
What does VPL stand for?
-Ventral posterolateral
38
Where do you find the primary somatosensory cortex?
-Post central gyrus
39
What system is related to feelings from our body such as temperature, pain, and itch?
-Anterolateral system
40
T/F | The anterolateral system is associated with emotion
True
41
In the anterolateral system what do your sensory neuron ending look like?
-Free nerve endings
42
What do the axons look like in the anterolateral system?
- Thin | - Maybe or maybe not myelinated
43
What are thin unmyelinated fibers called?
-C fibers
44
What are thin myelinated fibers called?
-A delta fibers
45
What are the two major classes of nociceptive neruons
- A delta nociceptors | - Polymodal C-nociceptors
46
What nociceptive neuron deals with sharp pain?
A-delta nociceptors
47
What nociceptive neuron deals with slower burning pain?
-Polymodal C-nociceptors
48
Where does the 2nd order neuron occur in the ALS pathway?
-Spinal cord
49
When does decussation occur in the ALS sensory pathway?
-Spinal cord
50
Is the first synapse in the ALS sensory pathway ipsilateral or contralateral?
-Ipsilateral
51
Where does the axons of the first order neurons in the ALS sensory pathway travel through if they are going up or down a few spinal cord levels?
-Tract of Lissauer
52
Where do the second order neurons decussate in the ALS pathway?
-Anterior white commissure
53
What do the second order neurons from the ALS sensory pathway ascend in?
-Anterolateral system
54
How do you tell if it is the cervical portion of the spinal cord?
-It will have both the gracile and cuneate tracts
55
What sensory pathway is contralateral in the spinal cord?
ALS
56
What sensory pathway is ipsilateral in the spinal cord?
-DCML
57
Where in the brain are both pathways, ALS and DCML, contralateral?
After the DCML decussates in the medulla
58
T/F | 3rd order neurons in the sensory systems pass through the internal capsule
True

Neuro 2020 (7 decks)

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