Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Semester 2 Year 1 > Sensory Receptors > Flashcards

Sensory Receptors Flashcards

1
Q

5 Types of sensory receptor:

A

Mechanoreceptors

Thermoreceptors

Nociceptors (pain receptors)

Electromagnetic receptors (rods and cones)

Chemoreceptors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Cutaneous mechanoreceptors - where are they found?

A

Skin tactile senses - epidermis and dermis

Deep tissue senses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Skin tactile senses:

A

Free nerve endings

Expanded tip endings - Merkel’s disks

Spray endings

Ruffini’s endings

Encapsulated endings - Meissner’s corpuscles

Hair end-organs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Deep tissue senses:

A

Free nerve endings

Expanded tip endings

Spray endings- Ruffini’s endings

Encapsulated endings - Pacinian corpuscles

Muscle endings - Muscle spindles + Golgi tendon organs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the touch receptors?

A

Pacini’s corpuscle

Meissner’s corpuscle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Pacini’s corpuscle:

A

Largest mechanoreceptors

Onion of encapsulated NE

Detects high frequency vibration

Rapidly adapting

Low activation threshold- sensitive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Meissner’s corpuscle:

A

Encapsulated NE - smaller than Pacini’s

Stacks of discs

Detects touch, flutter and low frequency vibration

Rapidly adapting

Low activation threshold - sensitive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the pressure/touch receptors?

A

Merkel disks

Hair follicles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Merkel disks:

A

Non-encapsulated NE

Detects static touch and light pressure

Slowly adapting

Low activation threshold - sensitive

Work with Meissner’s corpuscles to help determine texture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Hair follicles:

A

Embedded in skin

NE wrapped around follicle

Detects muscular movements of hair and external displacements of hair

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the stretch receptor?

A

Ruffini corpuscle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Ruffini corpuscle:

A

Encapsulated NE - weave between collagen fibres

Responds to skin stretch

Slowly adapting

Low threshold activation - sensitive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Muscle spindles:

A

Provide info about state of musculature

Within muscles in parallel with skeletal muscle fibres

Innervated by efferents and group Ia and II afferent

Efferents - sensitivity
Afferent - stretch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Golgi tendon organs:

A

Provide info about state of musculature

Within tendons in series with contractile fibres

Respond to degree of tension

Group Ib afferent fibres relay info to CNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Generator potential:

A

Potential caused by stimulus to NE

Generates AP in sensory neuron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Receptor potential:

A

Potential caused by stimulus to receptor cell

Affects amount of neurotransmitter released by receptor cell onto sensory neuron

17
Q

Receptor potential generation in Pacini’s Corpuscle: Myelination

A

Tip of NE is myelinated

18
Q

Receptor potential generation in Pacini’s Corpuscle: central fibre

A

Compression on outside deforms central fibre

19
Q

Receptor potential generation in Pacini’s Corpuscle: receptor potential

A

Induces current that spreads down nerve fibre

Reaches 1st node of Ranvier

20
Q

Receptor potential generation in Pacini’s Corpuscle: 1st Node of Ranvier

A

Current depolarises fibre membrane

APs spread to CNS

21
Q

What must happen for APs to fire?

A

Receptor potential above theshold

22
Q

What happens when receptor potential increases even more above theshold?

A

Greater AP frequency

23
Q

What is AP frequency in sensory nerve directly related to?

A

Stimulus size

24
Q

Slowly adapting sensory receptors:

A

Slow decline in action potentials firing - retain frequency

25
Q

Rapidly adapting sensory receptors:

A

Rapid decline in APs firing

Frequency is high but stops

26
Q

What is localisation of stimulus determined by?

A

Size of individual nerve

Density of sensory units

Amount of overlap in nearby receptive fields

27
Q

Receptive fields of sensory mechanoreceptors:

A

Pacini’s corpuscles - broad field

Meissner’s corpuscle + Merkel disks - very small fields

28
Q

What do small receptive fields allow?

A

High spatial resolution

29
Q

Why is lateral inhibition important?

A

To enable localisation of stimulus

30
Q

Neural pathways in somatosensory system:

A

Dorsal column

First-order neurons

Second-order neurons

Third-order neurons

peripheral receptors

31
Q

Where does sensory information go to?

A

Passes through thalamus to primary sensory cortex

Semester 2 Year 1 (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions