formative assessment

Question 1

where does corticobubar tract originate from?

Answer 1

primary motor cortex in precentral gyrus

Question 2

which 2 CN dont have bilateral innervation in corticobulbar tract ?

Answer 2

CN 12
lower part of CN 7
- if you wnat to have motor output to 3rd nerve, both left and right ocroticobular tract innervate the occulomotor nerve
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Question 3

wehre does corticobubar tract leave?

Answer 3

in the brainstem at the revelant CN

Question 4

7th nerve palsy

Answer 4

lower motor neurone - unilateral complete facial palsy (no forehead sparing)
central / upper lesions eg stroke, tumour - if you have on left side, the right side will still supply input to upper faical nucleu –> forehead sparing

Question 5

where does rubrospinal tract originate from?

Answer 5

red nucleus

Question 6

decorticate –

Answer 6

arms on top

Question 7

decerbrate

Answer 7

arms at side

upper limbs extended

Question 8

why does decorticate / decerbrate posture happen?

Answer 8

no injury to brain - corticospinal
lesion above midbrain - no corticospinal to spinal cord so only rubro and reticulo left
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