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PHY2011 - Neuroscience of communication, sensory and control systems - S1 2025

PHY2011 - Neuroscience of communication, sensory and control systems - S1 2025

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With respect to the image below which shows the flow of somatic sensory information from the periphery into the spinal cord, for the pathways shown in panel A, where are the second order neurons located?

Image failed to load: Somatic spinal cord pathways image

Thalamus

❌

Brainstem nuclei

✅

Cuneate, gracile and thalamic nuclei

❌

Thalamic VPM and VPL nuclei

❌

Spinal cord

❌

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In the main somatic pathways carrying proprioceptive information, the first order neurons are those

The second fastest conducting nerve fibres

❌

Terminating in the spinal cord

❌

Classed as A-alpha neurons

✅

Originating from the skin surface itself

❌

Originating from deep visceral structures

❌

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With respect to the image below which shows the flow of somatic sensory information from the periphery into the spinal cord, which of the following types of somatic information flows in the manner shown in panel B?

Image failed to load: Somatic spinal cord pathways image

Proprioception and fine touch

❌

Pain and affective touch and cold temperature

❌

Pain and cold temperature

❌

Pain, affective touch and temperature

✅

Proprioception and crude and fine touch

❌

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In the thalamus, the information from the body about fine touch, pressure and vibration:

goes to the VP nuclei.

✅

goes to the magnocellular layers of the LGN.

❌

goes to field 3b.

❌

never arrives as it goes direct to cortex.

❌

goes to the parvocellular layers.

❌

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In the pathways from the body surface carrying proprioceptive information, the third order neurons are those

From thalamus to primary sensory cortex

✅

From primary to secondary sensory cortex

❌

From spinal cord to thalamus

❌

From spinal cord to brainstem

❌

From primary to higher order sensory cortex

❌

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In the primary soamtosensory cortex, comparing RF sizes of neurons getting input from the shoulder and those getting input from the forearm, you would expect

RF sizes are distorted for the shoulder

neurons getting input from the shoulders would have the smaller sized RFs

neurons getting input from the shoulders would have the larger RFs

RF sizes will depend on the size of skin area you examine

RF sizes should be approximately the same size

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Information about fine touch and information about pain

are conducted through different pathways to different areas in somatosensory cortex.

are pathways in which the second order neurons cross over in the spinal cord.

are conducted to the VP nuclei in the thalamus.

are both conducted by A-beta nerve fibres.

are conducted by either A-alpha or A-beta nerve fibres.