lecture 13 somatic sensory

Question 1

special senses examples

Answer 1

vision, 
hearing, 
taste, 
smelling (including pheromones), 
vestibular (balance)

Question 2

somatic and visceral sensations examples

Answer 2

touch
pain
warm/cold
body position

Question 3

2 types of input into the CNS

Answer 3

direct- endocrine (hormonal)
nervous system (somatic, visceral, special)

Question 4

transduction

Answer 4

sensory receptor converts sensory stimulus into APs

Question 5

4 types of information sensory stimulus

Answer 5

Modality
Intensity
Duration
Location

Question 6

Proprioception structures (2)

Answer 6

how body detects itself in space- stretch reflex

1) muscle spindles- change in muscle length
2) golgi tendon organs- excessive stretch of tendon

Question 7

Touch structures (5)

Answer 7

merkel endings/disc = light pressure
pacini’s corpuscle = deep pressure high freq vibration
Meissner’s corpuscle = low frequency vibration
Ruffini’s corpuscle = crude/persistent stimuli
Krause’s end bulb = textural sensation

Question 8

Pain nerve endings (nociceptors) (2)

Answer 8

fast (acute)

slow/deep

Question 9

Medial Lamniscal Pathway (dorsal column)

Answer 9

“up and across”
1 neuron
2 neuron
3 neuron

Question 10

Lateral Spinothalamic Pathway (anterolateral)

Answer 10

“across and up”
1 neuron
2 neuron
3 neuron

Question 11

Primary somatosensory cortex

Answer 11

sensation = post central gyrus
perception = association/secondary region

Question 12

somatotopic organisation

Answer 12

areas of cortex correspond to areas of the body
densely innervated areas of body= large cortex
pathways cross over, left cortex represents right body