Motor And Sensory Systems Of The Brain ⛑

Question 1

What is discriminative sensation

Answer 1

Touch and pressure

Question 2

Where do the sensory nerves terminate (e.g c8 -L arm )

Answer 2

The cuneate fascicules

Question 3

The cuneate nucleus and Gracile nucleus =

Answer 3

Decussation/ crossing over

Located in the lower medulla

Question 4

The medial is a

Answer 4

White matter tract

Question 5

First, second and third order neutrons go to …

Answer 5

The primary sensory cortex

Question 6

The pathway of discriminative sensation aka

Answer 6

Dorsal column / medial lemniscal system

Question 7

The pathway for touch and pressure

Answer 7

. Cuneate/ glacial fascicules - Cuneate/ glacial nucleus - medial lemniscus medulla/pons/midbrain -internal causal

Question 8

Spinothalamic tract

Answer 8

Pain and temperature

Question 9

Sensory Input for p/t….

Answer 9

From free nerve ending

Question 10

Pain and temperature decussation…at

Answer 10

The anterior white commissure in sp

Question 11

A+C fibres in dorsolateral tract

Answer 11

= the zone of lissaure

Question 12

Where do the sensations of p/t and t/p meet?

Answer 12

In the medial lemniscus

Question 13

T/p first order end = cuneate or gracile nucleus …second order end =

Answer 13

Thalamus

Question 14

Partway for p/t

Answer 14

Free nerve ending- spinothalamic fibres in sp/ medulla/pons/ midbrain- internal capsule - primary sensory cortex

Question 15

Myelination

Answer 15

T/p= heavily 
P/t= none

Question 16

Conduction speed

Answer 16

T/p=50m/s

P/t=1m/s

Question 17

Function

Answer 17

T/p and p/t

Question 18

The first neuron terminates where ? (Both t/p and p/t)

Answer 18

T/p=cuneate/ gracile nucleus

P/t= great matter 1 and 2

Question 19

Corticospinal tract/ pyramidal tract has how many neurones and travels form …to

Answer 19

Only takes 2 neurones and travels from the motor cortex to the spinal cord

Question 20

Legion of the upper motor neurone results in

Answer 20

Spastic paralysis

Question 21

Legion to the lower motor neurones results in ..

Answer 21

Flasied paralysis

Question 22

What % of neurones cross and what is the tract called

Answer 22

Tract = lateral corticospinal tract = 85% - pyramidal decussation (for fine movements )

Question 23

What % take the anterior corticospinal tract

Answer 23

10 - 30 %

For big movements

Question 24

What is the basal ganglia 5

Answer 24

. Covate nucleus 
. Putamen 
. Globus palidus 
. Subthalonic nudeus 
. Substantial nygria

Question 25

85 % of dopamine is made in

Answer 25

The substrancra nygria

Question 26

What are the treatments for Parkinson’s

Answer 26

Pallidotmy = pill rolling termma - cut pyramidal neuron however cut both sides and you will have Parkinson’s
. Deep brain stimulation = pacemaker
. Levi-dopa
Highs and lowes

Question 27

Why do some parts of the body have a larger representation in the primary motor cortex than others?

Answer 27

Fine/Precise motor movements require more motor neurons, thus have a larger representation.

Question 28

A patient presents with a sudden stroke, which causes a spastic paralysis of the muscles on the left side of the face and left upper limb, a loss of sensation on the left hand, a loss of hearing in the left ear, and problems with nonverbal communication. Chose the answer with the correct areas affected in this stroke.

Answer 28

Right primary motor cortex; Right primary somatosensory cortex; Right auditory cortex; Non-dominant hemisphere

Question 29

A patient presents with Parkinson’s disease symptoms on the left side of the body. Choose the answer that best describes the major motor symptoms that the patient would show.

Answer 29

Bradykinesia, tremors at rest, muscle rigidity