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):
1

Name the ventromedial descending tracts

Pontine
Tectal
Vestibular

2

Name the dorsilateral descending tracts

Corticospinal
Rubral/ Rubrospinal
Hypothalamospinal

3

What is the difference between pyramidal and extra pyramidal tracts?

Pyramidal - Corticospinal and corticobulbar
Extra pyramidal - all the other descending tracts

4

Which descending tract innervates the pectoral girdle?

Rubrospinal

5

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

Rubrospinal

6

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

Hypothalamospinal

7

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

Hypothalamospinal

8

What are the symptoms of Horner's syndrome?

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

9

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

Internal capsule

10

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

85-90%

11

What effect does the pontine tract have on extensor muscles?

Excitates them

12

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

Corpus callosum

13

What is the only descending tract to remain ipsilateral?

Pontine

14

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

Corticospinal
Pontine

15

Where does the tectal spinal tract run?

Superior colliculus -> Cervical spinal cord

16

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

Tectal

17

What is ballistic reaching?

Moving with your shoulder more than with your hands

18

What input does the vestibular tract get?

Cranial nerve VIII

19

What tract helps keep us upright?

Vestibular

20

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?

Vestibular

21

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

Motor

22

Which lobe is most associated with motor function?

Frontal