???

Question 1

Receptive fields are defined as…

Answer 1

An area surrounding the receptor that when stimulated excites or inhibs the firing of a particular cell

Question 2

What areas of the body have the smallest receptive fields AND the largest number of receptive fields per area?

Answer 2

1. ) Tips of the fingers
2. ) Tongue

Question 3

What are the most sensitive parts of the body?

Answer 3

1. ) Tips of the Fingers
2. ) Tounge

Question 4

As you move ___direction___ receptive field size increases or decreases?

Answer 4

As you move proximal, receptive field size increase

Question 5

As you move \_direction_ density of receptors increase or decrease?

Answer 5

As you move proximal density of receptors decrease

Question 6

As you move proximally does sensitivity decrease of increase?

Answer 6

Decrease

Question 7

Dermatomes are defined as…

Answer 7

The area of the body surface contributing sensory input to one dorsal root

Question 8

What serves to sharpen peak of activity within the brain?

Answer 8

Lateral Inhibition

Question 9

Where does lateral inhibition occur first?

Answer 9

in the dorsal column nuclei and then at subsequent synapses in the CNS

Question 10

Lateral inhibition is also present in what other system?

Answer 10

Visual system

Question 11

Lateral inhibition serves to enhance distinction between what?

Answer 11

Two stimuli

Question 12

Lateral inhibition aids in recognition of what?

Answer 12

pattern and contour

Question 13

Excitatory discharge is greatest where? and inhibitory where?

Answer 13

Greatest at the center of a receptive field and inhibitory at the periphery

Question 15

Lateral inhibition is defined as what?

Answer 15

The capacity of an excited neuron to reduce the activity of its neighbors

Question 16

Lateral inhibition disables the spreading of what?

Answer 16

Action potentials from excited neurons to neighboring neurons in the lateral direction.

Question 17

Areas with the largest receptor density will have the largest what?

Answer 17

Cortical receptive field

Question 18

Orderly mapping of sensations from body surface onto CNS areas is as follows:

Answer 18

1. ) Dorsal Column Nuclei
2. ) Thalamus
3. ) Somatosensory cortex (Sensory homunculus)

Question 19

In the sensory cortex there are cells that respond to 3 aspects of the stimuls. What are those 3 aspects?

Answer 19

1. ) Specific orientation
2. ) Movement
3. ) Shape of stimulus