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Neuro 1 Exam 2 > Somatosensory I > Flashcards

Somatosensory I Flashcards

1
Q

Function of PCMLS

A

discriminative touch, flutter vibration, proprioception

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2
Q

Function of trigeminothalamic pathway

A

crude touch, thermal sensation, nociception

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3
Q

What do large diameter fibers relay

A

discriminative touch, flutter vibration and proprioception

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4
Q

What vascular structures supply the VPL and VPM

A

thalamogeniculate branches of posterior cerebral artery

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5
Q

What can happen if posterior cerebral artery is occluded

A

Loss of all tactile sensation over the contralateral body and head

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6
Q

What does VPL receive info from

A

medial lemniscus

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7
Q

What target VPL shell

A

pacinian and joint/muscle input

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8
Q

Where do VPL third order neurons terminate

A

Primary S1 and secondary S2 somatosensory cortices

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9
Q

What is S1 made of

A

postcentral gyrus and posterior paracentral gyrus

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10
Q

What supplies the S1 cortical area

A

Anterior and MCA

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11
Q

What do ACA lesions do for S1

A

Affect contralateral lower limb

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12
Q

What do MCA lesions do for S1

A

Tactile loss over contralateral upper body and face

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13
Q

What are the subdivisions of S1

A

3a and b, 1 and 2

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14
Q

Where is S2

A

deep in inner face of upper bank of lateral sulcus

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15
Q

What does S2 represent

A

body surface

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16
Q

What is agnosia caused by

A

lesions in parietal association area

17
Q

What is agnosia

A

contralateral body parts lost from body map, limb is not recognized as part of body

18
Q

Function of spinocerebellar pathways

A

propioceptive and limited cutaneous info to cerebellum, so joint angles and limb position. Role in guiding control of body muscle tone, movement an posture

19
Q

Function of Trigeminal n

A

sensory n. for head; muscles of mastication

20
Q

Where does Trigeminal n. attach on brainstem

A

adjacent roots on ventrolateral aspect of pons

21
Q

Four parts of trigeminal nuclei

A

main sensory nucleus
trigeminal motor nucleus
spinal nucleus
mesencephalic nucleus

22
Q

Function of main sensory nucleus of CN V

A

touch and pressure

23
Q

Function of trigeminal motor nucleus

A

muscles of mastication

24
Q

Function of spinal nucleus of CN V

A

pain and temperature

25
Q

Function of mesencephalic nucleus

A

proprioceptive afferents from TMJ and masticatory m.

26
Q

What are the two parts of the main sensory nucleus

A

dorsomedial division: oral cavity

ventrolateral division: afferents from V1-V3

27
Q

Where do second order fibers of ventrolateral division project

A

contralaterally via trigeminothalamic tract

28
Q

Where do second order fibers of dorsomedial division project

A

ipsilateral vai trigeminothalamic tract

29
Q

What plays a role in the jaw-jerk reflex

A

mesencephalic nucleus

30
Q

Function of Pars interpolaris

A

proprioceptive input from jaw related to chewing and jaw placement

Neuro 1 Exam 2 (13 decks)

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