Somatic Sensory System

Question 1

Sensory receptors differ by

Answer 1

shape of ending
axon diameter
sensitivity
presence/absence of myelin

Question 2

classification of peripheral nerves (fiber diameter)

Answer 2

A-alpha, A-beta, A-gamma, A-delta, B, C
or
Ia, Ib, II, III, IV

Question 3

A-alpha

Answer 3

alpha-motoneurons
muscle spindle primary endings
golgi tendon organs
touch

Question 4

A-beta

Answer 4

touch
kinesthesia
muscle spindle secondary endings

Question 5

A-gamma

Answer 5

touch
pressure
gamma-motoneurons

Question 6

A-delta

Answer 6

pain
crude touch
pressure
temperature

Question 7

B

Answer 7

preganglionic autonomic

Question 8

C

Answer 8

pain
touch
pressure
temperature
postganglionic autonomic

Question 9

Ia

Answer 9

muscle spindle primary endings

Question 10

Ib

Answer 10

golgi tendon organs

Question 11

II

Answer 11

touch
kinesthesia
muscle spindle secondary endings

Question 12

III

Answer 12

pain
crude touch
pressure
temperature

Question 13

IV

Answer 13

pain
touch
pressure
temperature

Question 14

4 attributes of a stimulus

Answer 14

1. modality
   2 intensity
2. duration
3. location

Question 15

what sensory: dorsal column medial lemniscal pathway

Answer 15

fine touch, proprioception

Question 16

how does DCML travel

Answer 16

ipsilaterally in spinal cord to medulla
crosses contralateral side to thalamus
then sensory cortex

Question 17

what sensory: anterolateral (spinothalamic) pathway

Answer 17

coarse touch
pain
temperature

Question 18

how does anterolateral travel

Answer 18

enters spinal cord, synapses onto another neuron
and then crosses to opposite side of spinal cord
travels contralaterally to brain stem, thalamus, sensory cortex

Question 19

what sensory: spinocerebellar tract

Answer 19

proprioceptive information to cerebellum

Question 20

what receptor provides cutaneous feedback

Answer 20

skin mechanoreceptors

Question 21

Superficial receptors

Answer 21

Meissner’s - spatial acuity

Merkel’s

Question 22

Deeper receptors

Answer 22

Ruffini - detect movement, skin stretch

Pacinian

Question 23

Slow adapting

Answer 23

Merkel disk receptors

Ruffini endings

Question 24

Rapid adapting

Answer 24

Meissner’s corpuscles

Pacinian corpuscles

Question 25

dermatomes

Answer 25

cutaneous regions innervated by individual DRGs

Question 26

Shingles

Answer 26

-reactivation of herpes and virus travels along peripheral axon branches - pain

Question 27

What does two-point discrimination test do

Answer 27

measures tactile spatial discriminatory ability

-limited by overlapping of receptive fields