Mechanosensation

Question 1

What is mechanosensation?

Answer 1

Touch, pressure, vibration

Question 2

What is proprioception

Answer 2

Joint and muscle position

Question 3

What is thermosensation

Answer 3

Temperature

Question 4

What is nociception

Answer 4

Pain

Question 5

What are the different types og high threshold unita

Answer 5

High threshold mechanoreceptors, thermal nociceptors, Chemical nociceptors, and polymodal nociceptors

Question 6

Slowy adapting response

Answer 6

Continuos information to CNS while terminal deformed.
E.g. stretch receptors

Question 7

Rapidly adapting response

Answer 7

Detects change in stiumuls strength.
No of impulses proportional to rate of change of stimulus

Question 8

Very rapidly adapting response

Answer 8

Respodns only to very fast movement e.g vibrations

Question 9

A-alpha neurons

Answer 9

Thick myleination, propiroceptors in the skin

Question 10

A-beta neurons

Answer 10

Moderate myelination, Mechanoreceptors of the skin

Question 11

A-delta neurons

Answer 11

Thin myelination, fast pain and cool temps

Question 12

C neurons

Answer 12

No myelination, slow pain

Question 13

Receptive field

Answer 13

The region, that when stimulated with an adequate stimulus, causes a response in that neuron

Question 14

Cutaneous receptors

Answer 14

Free nerve endings
Meissner’s corpuscles
Merkel’s discs
Hair-end organs
Ruffini endings
Pacinian curpuscles
(fuck me man, her racks perfect)

Question 15

Where do sensory neurons enter the spinal cord

Answer 15

Dorsal horn

Question 16

What is a dermatome

Answer 16

Area of skin innervated by the left and right dorsal roots of a signle segment

Question 17

How can dermatomes be mapped

Answer 17

Set of 4 bands on the body, seen clearer on all fours

Question 18

When do A-alpha and beta fibres cross to the contralateral side of the spinal cord?

Answer 18

2nd order neuron

Question 19

when do A-delta, C fibres cross over

Answer 19

Bottom of the spinal cord

Question 20

What are the two components of the dorsal colum?

Answer 20

Fasciculus gracilis, Fasciculus cuneatus

Question 21

What is the major route by which touch and proprioception information ascends into the cebral cortex

Answer 21

Dorsal column medial leminiscal pathway

Question 22

What are the steps of the DCML pathway

Answer 22

1. PA neuorns enter dorsal horn and form branches which synapse in the dorsal horn with second order neurons, and an ascending component that synapses in the medulla
2. Axons of second order neurons cross in the great sensory decussation and ascend into the medial lemniscus to the ventroposterolater (VPL) nucleus of the thalamus
3. Third order neurons project to the primary somatosensory cortex (S1) via the posterior interal capsule

Question 23

What is the secondary somatosensroy cortex

Answer 23

Recieves and integrates info from S1 and other cortical areas and sub-cortical areas

Question 24

What is S2 important for

Answer 24

tactile touch and object recognition

Question 25

What is the posterior parietal cortex

Answer 25

Involved in sensory fuidance of movement

Question 26

What can damage to the posterior parietal cortex result in

Answer 26

asterognosia, hemispatial neglect syndrome