Sensory & Motor Tracts

Question 1

Sensory information arrives where?

Answer 1

information arrives at the spinal cord

Question 2

Motor information exists where?

Answer 2

information exits at the spinal cord

Question 3

What communicates between the central nervous systems and the peripheral nervous system

Answer 3

nerves (fibers, axons)

Question 4

Information that ends in the cerebral cortex how many neurons are involved?

Answer 4

involves 3 neurons

Question 5

Information that ends in the cerebellum how many neurons are involved?

Answer 5

involves 2 nuerons

Question 6

What do sensory receptors do?

Answer 6

Sensory receptors monitor conditions inside the body and in the external environment

Question 7

Name the 3 sensory nuerons

Answer 7

First-order neuron
Second-order neuron
Third-order neuron

Question 8

What do the 3 sensory neurons do?

Answer 8

deliver sensory information to the sensory cortex of the cerebrum or cerebellum

Question 9

Where does the information from the sensory neurons travel to?

Answer 9

spinal cord, brainstem, or cerebral cortex (thalamus)

Question 10

The information that reaches the cerebral cortex has to pass through what?

Answer 10

95% of information that arrives at the cerebral cortex passes through the thalamus

Question 11

What does the first order neuron send the information?

Answer 11

arrives from the PNS to the CNS at the spinal cord level then to the brainstem

Question 12

where does the sensory information arrive from?

Answer 12

dorsal root ganglion

Question 13

One the first order neuron reaches the brain stem what occurs?

Answer 13

synapses with a second order nueron

Question 14

Where does the second order neuron send the information?

Answer 14

goes to the thalamus where it synapses with a third order nueron

Question 15

In your sensory homunculus what parts of your body have more sensory receptors?

Answer 15

hands, lips

Question 16

Body areas that are more lateral are received where in the cerebral cortex?
Body areas that are more medial are received where in the cerebral cortex?

Answer 16

Areas of your body that are more lateral will be received more medial and more medial things will be received more lateral.

Question 17

Sensory neurons can be arranged in three different ways.

Answer 17

Sensory modality arrangement
Medial-lateral rule
Somatotopic Arrangement

Question 18

What is the Sensory Modality Arrangement?

Answer 18

Information that is the same is grouped together and always follows a specific tract

Question 19

What is the Medial-Lateral Rule?

Answer 19

Information coming from more inferior areas of your body run more medial.
Information coming from more superior areas of your body run more lateral.

Question 20

What is the Somatotopic Arrangement?

Answer 20

Sensory information coming from a certain region of the body go through the same tract. So all info from the hand will travel through the same tract,

Question 21

what are the 3 sensory tracts?

Answer 21

Posterior Columns
Spinocerebellar Tract (anterior & posterior)
Spinothalamic Tract (lateral & anterior)

Question 22

Where does the Spinocerebellar Tract start and end?

Answer 22

Spinocerebellar Tract- starts on spinal cord and ends at the cerebellum

Question 23

Where does the Spinothalamic Tract start and end?

Answer 23

Spinothalamic Tract- starts on spinal cord and ends on thalamus

Question 24

How many neurons does the Spinocerebellar tract involve?

Answer 24

Spinocerebellar Tract involves 2 neurons

Question 25

How many neurons Spinothalamic Tract involve?

Answer 25

Spinothalamic Tract involves 3 neurons

Question 26

Where does the posterior columns start and end?

Answer 26

start in the posterior region of the spinal cord in 2 different areas of the posterior region

Question 27

Where does the posterior columns go to?

Answer 27

Thalamus

Question 28

Does a spinocerebellar tract have a 3rd order neuron?

Answer 28

No

Question 29

What are the types of motor neurons?

Answer 29

Upper and Lower Motor Nuerons

Question 30

Where does information from the upper motor neuron go?

Answer 30

Exits the cerebral cortex. 85% of the info crosses at the brain stem and exists via the ventral root 15% comes down straight

Question 31

What does the somatic nervous system do?

Answer 31

directs of skeletal muscles

Question 32

What does the Autonomic nervous system do?

Answer 32

directs theactivity of glands, smooth muscles, and cardiac muscle viseral effectors

Question 33

The Motor homunculus demonstrates tje body parts we use a lot in movement. Name two examples.

Answer 33

hands, tongue

Question 34

What does your first order neuron do to your second order neuron?

Answer 34

It can Inhibit (blocks) or excite your lower motor neuron

Question 35

Name the 6 Descending Motor Tracts that carry SUBCONSCIOUS motor commands

Answer 35

Rubrospinal Tract Vestibulospinal tracts Tectospinal tracts Reticulospinal tracts

Question 36

Name the 2 Descending Motor Tracts that carry CONSCIOUSmotor commands

Answer 36

Lateral corticospinal tracts | Anterior corticospinal tracts

Question 37

Where does motor information leave in the brain? | Where does sensory information arrive at the brain?

Answer 37

Motor information will leave via the anterior part of your brain Sensory information will arrive via the posterior part of your brain

Question 38

Information that is not going to skeletal muscle but is going to your organs is using what nervous system?

Answer 38

Autonomic Nervous System