8.2 Sensory

Question 1

4 aspects of something that can be perceived

Answer 1

• modality
• intensity
• duration
• location

Question 2

What is modality?

Answer 2

=quality

Type of R

Question 3

Define what is threshold

Answer 3

The point when the stimulus intensity is such that in 50% of cases we can detect a stimulus and 50% we can’t

Question 4

Structure of the sensory neurons

Answer 4

Typically pseudo-unipolar

But can also be Bi-polar (olfactory, retina, auditory, vestibular)

Question 5

What does somatosensory R includes?

Answer 5

Mechano
Thermo
Nociceptors

Question 6

What does rapidly adapting means?

Answer 6

Can only detect a signal if it is quickly on and off.

Surrounded by a capsule

Question 7

Describe slowly adapting R

Answer 7

Don’t have a capsule

Stimulus willlast longer

Question 8

Describe Pacinian R

Answer 8

Deep (subcutaneous)
Rapidly adapting
Detects vibration

Question 9

What are the two somatosensory pathways?

Answer 9

Dorsal column- medial leminiscus

anterolateral (spinothalamic tract)

Question 10

What R does the DC-ML uses?

Answer 10

• Mechano (Pacinian, Ruffini, Meissner, Merkel)

- Proprioceptors

Question 11

What does the DC-ML responsible for?

Answer 11

Detection of fine touch, vibration, proprioception, 2 point discrimination

Question 12

What R does the AnteroLateral pathway uses?

Answer 12

Thermo

Nocioceptors

Question 13

What info does the Ant spinothalamic tract carries?

Answer 13

Crude touch

Question 14

What info does the Lateral spinothalamic tract carries?

Answer 14

Pain and temperature

Question 15

What tract in the head is the analog to spinothalamic tract?

Answer 15

Trigemino-thalamic

Question 16

Where does the somatosensory pathway terminates in the cortex?

Answer 16

Post-central gyrus

Broadman’s area 3,1,2