B5 CNS: Anatomy of the Motor Nervous System Flashcards Preview

Phase I Medicine > B5 CNS: Anatomy of the Motor Nervous System > Flashcards

Flashcards in B5 CNS: Anatomy of the Motor Nervous System Deck (22)
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1
Q

Name the ventromedial descending tracts

A

Pontine
Tectal
Vestibular

2
Q

Name the dorsilateral descending tracts

A

Corticospinal
Rubral/ Rubrospinal
Hypothalamospinal

3
Q

What is the difference between pyramidal and extra pyramidal tracts?

A

Pyramidal - Corticospinal and corticobulbar

Extra pyramidal - all the other descending tracts

4
Q

Which descending tract innervates the pectoral girdle?

A

Rubrospinal

5
Q

A patient presents with intention tremors and impaired distal arm and hand movement. Which tract has been affected?

A

Rubrospinal

6
Q

Which tract is most closely associated with Horner’s syndrome?

A

Hypothalamospinal

7
Q

What tract is responsible for the sympathetic input to the facial muscles?

A

Hypothalamospinal

8
Q

What are the symptoms of Horner’s syndrome?

A

Anhydrosis- Loss of sweat glands
Ptosis- Droopy eyelids
Miosis- Dilated pupil

9
Q

What structure would have to be damaged for you to get a complete descending tract lesion?

A

Internal capsule

10
Q

What percentage of fibres that go on to supply the trunk in the cortical pathway decussate in the medulla?

A

85-90%

11
Q

What effect does the pontine tract have on extensor muscles?

A

Excitates them

12
Q

Where would you find the biggest bundle of commissure fibres in the brain?

A

Corpus callosum

13
Q

What is the only descending tract to remain ipsilateral?

A

Pontine

14
Q

Which tracts can project to the dorsal gray and modify sensory information?

A

Corticospinal

Pontine

15
Q

Where does the tectal spinal tract run?

A

Superior colliculus -> Cervical spinal cord

16
Q

What tract is responsible for innervating the proximal shoulder girdle and neck?

A

Tectal

17
Q

What is ballistic reaching?

A

Moving with your shoulder more than with your hands

18
Q

What input does the vestibular tract get?

A

Cranial nerve VIII

19
Q

What tract helps keep us upright?

A

Vestibular

20
Q

A patient is brought in by a friend- they are not able to navigate themselves and they have no sense of balance though they can still use their extremities. Which tract is this most likely to affect?

A

Vestibular

21
Q

Is the pre-central gyrus sensory or motor in function?

A

Motor

22
Q

Which lobe is most associated with motor function?

A

Frontal