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Neuro 2 > Class 7 - Somatic Sensations > Flashcards

Class 7 - Somatic Sensations Flashcards

1
Q

Somatic sensory pathways consist of sets of __ neurons

A

3

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2
Q

First order sensory neurons are found in the _____ and travel to the ___

A

PNS

brain stem & spinal cord

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3
Q

2nd order neurons travel from the ___ to the ___

A

brain stem and spinal cord TO the thalamus

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4
Q

Which neuron in the 3 neuron pathway decussates?

A

2nd order neurons

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5
Q

T/F: all somatosensory information from one side of the body reaches the same side of the thalamus.

A

False

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6
Q

Where are 3rd order neurons found and where do they travel to?

A

in the thalamus, to the primary somatosensory area of the cortex on the SAME SIDE

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7
Q

The postcentral gyrus is found in the ___ lobe and contains the ____

A

PARIETAL, primary somatosensory area

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8
Q

The thalamus is joined by the ___ in 70% of brains

A

interthalamic adhesion

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9
Q

Which sense does NOT travel through the thalamus?

A

olfaction

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10
Q

Axons between the thalamus and cortex pass through the…

A

internal capsule

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11
Q

The ventral group nuclei function in ____

A

movement control

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12
Q

The midline thalamic nuclei plays a role in…

A

memory and olfaction

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13
Q

The anterior, medial and lateral thalamic nuclei all are involved in…

A

emotional memory

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14
Q

Which of the posterior column nuclei is responsible for the lower limb & trunk?

A

gracile nucleus

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15
Q

The posterior column neurons decussate ____ entering the medial lemniscus

A

BEFORE

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16
Q

What sensory information is relayed by the spinothalamic tracts?

A

pain, temperature, crude touch, itch & tickle

17
Q

What are the epicritic sensations?

A

discriminative touch, pressure, vibration, conscious proprioception

18
Q

Where does the spinothalamic tract decussate?

A

near where it enters the spinal cord, before ascending

19
Q

The lateral spinothalamic tract is responsible for _____ and ____

A

pain and temperature

20
Q

The 1st order neuron of the trigeminothalamic pathway has its body found in the ____

A

trigeminal ganglion

21
Q

Where do the 1st order axons of the trigeminothalamic pathway synapse with 2nd order neurons?

A

in the pons OR they will descend to the medulla oblongata to synapse there

22
Q

Where is the trigeminal nuclei?

A

in the pons and medulla

23
Q

Where is the cell body of 2nd order trigeminothalamic pathway neurons?

A

in the trigeminal nuclei

24
Q

True or false: trigeminothalamic 2nd order neurons will decussate in the ___ and then synapse with 3rd order neurons in the opposite side thalamus.

A

fix

25
Q

Where are the anterior & posterior spinocerebellar tracts found?

A

lateral white matter of spinal cord

26
Q

Bowman’s glands are found in the ___ and produce ____

A

olfactory epithelium

mucus to dissolve odorants

27
Q

Olfactory cells have a ___ lifespan

A

1 month

28
Q

Supporting cells & olfactory glands are innervated by the…

A

facial nerve

29
Q

Olfactory receptor cells are ___ neurons (structural type) that synapse with 2nd order neurons in the olfactory bulb.

A

bipolar neurons with a bare dendrite

30
Q

Olfactory receptors adapt by __% in the first second and __ thereafter

A

50%

slowly

31
Q

Complete insensitivity to some strong odors can occur in about __ after exposure

A

1 minute

32
Q

The olfactory nerves are a bundle of about __ unmyelinated axons from the olfactory receptors

A

40

33
Q

The olfactory nerve (CN I) is the __ order neuron in the olfactory pathway

A

1st order`

34
Q

Where is the primary olfactory area found in the brain?

A

inferior & medial surface of temporal lobe AND limbic system

35
Q

True or false: the special senses have 3 order neuron pathways

A

FALSE

36
Q

Meibomian glands purpose is to…

A

prevent the eyelids from sticking to each other

37
Q

Infection of a meibomian gland is called a…

A

chalazion

38
Q

The bulbar conjunctiva extends from the…

A

eyelid to anterior eyeball, NOT covering the cornea

Neuro 2 (11 decks)

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