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Biology Of The Mind > Sensory Receptors And CNS Pathways > Flashcards

Sensory Receptors And CNS Pathways Flashcards

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0
Q

What does the viscerosensory system respond to?!

A

Internal environment

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1
Q

What does the somatosensory system respond to?!

A

External environment

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2
Q

Through which root do sensory afferents enter the spinal cord?!

A

Dorsal

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3
Q

Through which root do motor efferents leave the spinal cord?!

A

Ventral

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4
Q

What are the three classes of somatosensory receptors?!

A

Thermoreceptors
Nociceptors
Mechanoreceptors

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5
Q

What are poly modal receptors?!

A

Can respond to all forms of stimuli - mechanical, chemical and thermal

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6
Q

What does the dorsal root ganglion contain?!

A

Cell bodies

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7
Q

What are the sensory receptors in the skin?!

A 
Pacinian corpuscle
Merkels disks
Free nerve endings
Ruffini's corpuscle
Meissner corpuscle
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8
Q

Which sensory receptors in the skin detect vibrations?!

A

Pacinian corpuscle and ruffinins corpuscle

Both are located deeper in the dermis

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9
Q

Which sensory receptors detect light touch?!

A

Merkels discs
Free never endings
Meissner corpuscle

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10
Q

What is pacinian corpuscle composed of?!

A

Single sensory neurone surrounded by fluid filled sacs forming an onion shape

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11
Q

What are the meissner corpuscles composed off?!

A

Looping axon terminals intertwined with supporting cells

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12
Q

What is Ruffini’s corpuscle composed of?!

A

Nerve terminals intertwined with collagen fibres

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13
Q

What are merkels discs composed of?!

A

Dome like structure of axon terminals and merkel cells

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14
Q

What do the free nerve endings penetrate?!

A

Epithelial cells

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15
Q

What is the process of sensory transduction?!

A

Stimulus deforms the nerve ending
Alters the membrane potentials = action potential
Travels along the axon to the CNS

16
Q

Which are the faster conducting and larger diameter sensory afferents?!
Alpha groups or C fibres

A

Alpha groups

17
Q

Where does nociceptive information synapse?!

A

Dorsal horn

18
Q

Where does information regarding pressure synapse?!

A

Neurones in the dorsal column nuclei (brain stem)

19
Q

Which follows the anterolateral pathway?!

A

Mechanoreceptor - information carries up the same side it arose from

20
Q

What is the second order neurone in the mechanosensory pathway?!

A

Central neurone (to thalamus)

21
Q

What is the primary neurone in the mechanosensory pathway?!

A

Primary afferents (into dorsal horn)

22
Q

What is the 3rd order neurone in the mechanosensory pathway?!

A

Central neurone (to cortex)

23
Q

Where does transduction of painful stimuli occur?!

A

Free nerve endings of unmyelinated C fibres and thinly myelinated Ad fibres

24
Q

What do chemical nociceptors respond to?!

A

Histamine or other chemicals

25
Q

Where are nociceptors found?!

A

The periphery as simple free nerve endings

26
Q

Where do peripheral nerve fibres for nociceptors end?!

A

In the dermis (unmyelinated)

27
Q

What type of neurotransmitter do pain afferents release?!

A

Excitatory - glutamate

28
Q

What type of pathway does pain undergo?!

A

Contralateral

Biology Of The Mind (16 decks)

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