Phys 48-49: Sensations

Question 1

Meissners corpuscle

Answer 1

Type Αβ myelinated sensory fiber

Sensitive to movement over skin and low frequency vibrations

Rapid adaptation

Question 2

Merkel’s disks

Answer 2

aka expanded tip receptor

Continous touch

Initially strong but then weak continous signal

type Aβ myelinated nerve fiber

Question 3

Hair end organ

Answer 3

Detects hair movement

Question 4

Ruffinis endings

Answer 4

Prolonged heavy touch and pressure

Question 5

Pacini corspuscle

Answer 5

Vibration (rapid)

Adapt quickly

Question 6

Free nerve ending fiber type

Answer 6

Aδ

slow af

Also type C for tickling sense

Question 7

Tickle and itch detected by

Answer 7

Free nerve endings

Question 8

Sensory info enters spinal cord through

Answer 8

Dorsal root of spinal nerve

Question 9

Dorsal column/medial lemniscal transmits

Answer 9

Discriminative touch, proprioception

Question 10

Anterolateral system transmits (spinothalmic)

Answer 10

Pain, thermal, crude touch, tickle, itch, sex

Question 11

Bilateral excision of somatosensory area 1 symptoms

Answer 11

cannot judge characteristics of touch, just crude parts

Question 12

somatosensory association areas numbers

Answer 12

5 and 7

Question 13

Anterolateral column crosses at

Answer 13

Level of spinal cord root

Question 14

Dorsal column crosses at

Answer 14

lower medulla

Question 15

Spinothalmic tracts aka

Answer 15

anterior/lateral tracts

Question 16

Pain resulting from heat correlates to

Answer 16

RATE of tissue damage destruction

Question 17

Fast pain fibers

Answer 17

Aδ

Question 18

slow pain fibers

Answer 18

C

Question 19

Fast pain tract

Answer 19

Neospinothalmic

Question 20

Slow pain tract

Answer 20

Paleospinothalmic

Question 21

Neurotransmitter of Aδ nerve fibers

Answer 21

Glutamate

Question 22

Type C nerve fiber neuro transmitter

Answer 22

Substance P

Question 23

Slow pain ends up in

Answer 23

Reticular system (no sleep when pain)

Question 24

Cordotomy

Answer 24

Spinothalmic tract is cut to reduce pain. Lasts a few months before other tracts take over

Question 25

3 parts of anlgesia system

Answer 25

Periventricular/Periaquedutal

Raphe magnus nucleus/ Nucleus reticularis

Pain inhibitiroy complex in dorsal horns of cord

Question 26

Enkaphalin

Answer 26

AKA endogenous opiate in brain and spinal cord

Question 27

Endorphin

Answer 27

Endogenous opiate in hypothalmus and pituitary

Question 28

Visceral pain transmitted by ____ fibers

Answer 28

C

Question 29

Why is parietal pain localized

Answer 29

follows parietal tract

(think pleuritic chest pain)

Question 30

What stimulates pain nerve endings in ischemia

Answer 30

Bradykinin, proteolytic enzymes

Question 31

Parietal vs visceral pain

Answer 31

Parietal is sharp

Visceral is dull

Question 32

Hyperalgesia primary vs secondary

Answer 32

Primary: nerve endings too sensitive (eg sunburn)

Secondary: Too much transmission (seen on spinal or thalmic lesions)

Question 33

Herpes zoster shingles affects

Answer 33

A single DRG

Question 34

Tic douloreux

Answer 34

Stabbing pain in face (trigeminal or glossopharyngeal)

Causes by mechanorecptors, not pain nerve endings

Question 35

Brown-Sequard syndrome

Answer 35

Transection of half of spinal cord

flacid paralysis at level of injury

Ipsilateral loss of discriminative touch and proprioception

Contralateral pain and thermal loss

Question 36

Cerebral vault headache location

Answer 36

Front

Question 37

Brainstem and cereballar vault headache location

Answer 37

back

Question 38

Headache of meningitis felt over

Answer 38

entire head

Question 39

Alcohol headache reasons

Answer 39

Alcohol is toxic and damages meninges

Dehydration exacerbates

Question 40

Cold pain fiber range

Answer 40

less than 10 degrees C

Question 41

Cold fiber range

Answer 41

10 C to 40C

Peaks at 24 C

Question 42

Warm receptor range

Answer 42

30 C to 45 C

Question 43

Heat pain receptor range

Answer 43

45 and up

also cold fibers due to damage