Neuro Tracts

Question 1

what is the function of the rubrospinal tract?

Answer 1

excites flexor and inhibits extensor

Question 2

where does the dorsal column synapse?

Answer 2

nucleus cuneatus - ul t6 and above nucleus gracillus - ll t6 and below

Question 3

what is the direct pathway

Answer 3

silencing of neurons in globus pallidus which frees thalamus of inhibitory effects of basal ganglia – allows movement

Question 4

long term memory

Answer 4

hippocampus

Question 5

nigrostriatal

Answer 5

connects pars compacta to striatum - dopamine

Question 6

short term memory

Answer 6

prefrontal cortex

Question 7

where does the dorsal column dessucate?

Answer 7

contralateral medial leminiscus

Question 8

what does the corticobulbar tract do?

Answer 8

umn to cn

Question 9

what is the indirect pathway

Answer 9

subthalamic nucleus increases suppression of unwanted movement

Question 10

what is the function of the tectospinal tract?

Answer 10

coordinates movements of the head and neck

Question 11

where do the fibres cross in the vestibulospinal tract?

Answer 11

vestibular nucleus in the pons

Question 12

where does the reticulospinal tract cross and what is the function?

Answer 12

reticular formation in the pons and medulla pontine fascilitates and medullary inhibites voluntary movement and tone

Question 13

skill memory

Answer 13

cerebellum

Question 14

what is the function of the vestibulospinal tract?

Answer 14

extensors of legs and flexors of arms - muscles of anti gravity

Question 15

what does the basal ganglia do?

Answer 15

constantly inhibits thalamus to prevent unwanted movements

Question 16

what are the 3 spinocerebellar pathways

Answer 16

dorsal spinocerebellar - ll ventral spinocerebellar - ll cuneocerebellar - ul

Question 17

where does the rubrospinal tract originate from

Answer 17

red nucleus in the midbrain

Question 18

how does a movement occur?

Answer 18

thought occurs in the prefrontal cortex - speaks to primary motor cortex – goes to basal ganglia which checks it – cerebellar puts in proprioceptive info – back to motor cortex – funnels through internal capsule – then down across and out via the anterior horn at the app level of the spinal cord

Question 19

vascular/ alzheiemrs

Answer 19

amyloid

Question 20

lewy body / parkinsons

Answer 20

alpha synuclein

Question 21

where do the fibres in the spinocerebellar pathways cross?

Answer 21

they don’t! transmits ipsilaterally

Question 22

frontotemporal

Answer 22

tau

Question 23

what are the 4 components of the limbic system?

Answer 23

cingulate gyrus ; hypothalamus; amygdala (emotional reactions) ; hippocampus

Question 24

tuberinfundibular

Answer 24

prolactin under dopamine inhibition

Question 25

where does the tectospinal tract originate from

Answer 25

the superior colliculus in the midbrain

Question 26

what are the functions of the two csts and where do they dessucate

Answer 26

lateral - distal limb and desuccates at the desucation of pyramids anterior - proximal and desuccates via the anterior white commissure

Question 27

what are the two parts of the substantia nigra\>

Answer 27

pars reticulata - relays to thalamus and inhibits movement pars compacta - nigrostriatal pathway uses dopamine to send signals to the striatum

Question 28

stt travels via the tract of

Answer 28

lausseur

Question 29

mesolimbic

Answer 29

dopamine reward pathway