L06 Sensory Pathways Flashcards

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1
Q

which of the 5 sensory modalities does not go through the thalamus?

A

smell

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2
Q

which senses does the spinothalamic tract serve?

A

nociception
temperature
crude touch

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3
Q

which senses does the dorsal columns/medial lemniscus pathways serve?

A

light touch
proprioception
vibration

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4
Q

postcentral gyrus is for what?

A

1º somatosensory cortex

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5
Q

precentral gyrus is for what?

A

1º motor cortex

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6
Q

where is the primary gustatory cortex?

A

inferior region of the postcentral gyrus

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7
Q

where is the primary auditory cortex?

A

transverse temporal gyri on superior surface of superior temporal gyrus

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8
Q

where is the primary visual cortex?

A

sup and inf to the calcarine fissure in the occipital lobe

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9
Q

where is the primary olfactory cortex?

A

uncus and amygdala

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10
Q

where are 1º sensory cell bodies for the body?

A

dorsal root ganglion

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11
Q

where are 1ºsensory cell bodies for the face?

A

trigeminal ganglion

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12
Q

where can you find the 2º sensory neuron bodies? where do their axons project?

A

in the dorsal horn or a brainstem nucleus. axons go to the contralateral thalamus.

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13
Q

the dorsal columns can be further divided into two symmetrical sets of what?

A
fasciculus cuneatus (lateral)
fasciculus gracilis (medial)
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14
Q

name the route of spinothalamic tract

A

1º neuron cell body in DRG
2º neuron cell body in STT, and decussates very early on. axon project to:
3º neuron cell body in VP thalamus. axon projects to 1º SS ctx in postcentral gyrus

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15
Q

how are the cervical, thoracic, lumbar, and sacral segments arranged in the STT?

A

medial to lateral: C, T, L, S

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16
Q

what kind of neurons are 1º SS?

A

pseudounipolar

17
Q

which sulci bound the fasciculus gracilis?

A

dorsal median and dorsal intermediate

18
Q

which sulci bound the fasciculus cuneatus?

A

dorsal intermediate and dorsal lateral

19
Q

fasciculus gracilis contains neurons for which part of the body?

A

lower body

20
Q

fasciculus cuneatus contains neurons for which part of the body?

A

upper body

21
Q

what is the medial lemniscus?

A

a collection of dorsal column axons that travels (post decussation) through the brainstem

22
Q

at which spinal level does fasciculus cuneatus begin?

A

T6

23
Q

the trigeminal nucleus has which three nuclei?

A

mesencephalic
chief sensory
spinal trigeminal

24
Q

what does the mesencephalic nucleus do?

A

1º SS neurons
proprioception from jaw
reflex arc with masticator nucleus of V

25
Q

what does the chief sensory nucleus do?

A

2º SS neurons

encodes touch/vibration info DC/ML

26
Q

what does the spinal trigeminal nucleus do?

A

2º SS neurons
encodes noc/temp info STT
continuous with dorsal horn of spinal cord