Quiz 8: Brainstem Tracts & Cranial Nerves

Question 1

2 major descending white matter tracts

Answer 1

Pyramidal tract

Extrapyramidal tract

Question 2

Pyramidal tract

Answer 2

Controls patterns of movement (raising hand, etc)

Direct system for motor control from cortex to LMN

2 primary components: corticobulbar tract (travels bilaterally) and corticospinal tract (contralateral with crossing at pyramids of medulla)

Question 3

Extrapyramidal tract

Answer 3

Controls posture and tone of movement

Indirect system for motor control from cortex and subcortical areas

Passes through specialized nuclei in brain stem and forms 3 tracts to LMN: rubrobulbar, rubrospinal, and tectospinal

Question 4

Cranial nerves

Answer 4

12 total

Contralateral control for limbs

Bilateral control for corticobulbar system

Question 5

Non-speech cranial nerves

Answer 5

1 - olfactory

2 - optic

3 - oculomotor

4 - trochlear

6 - abducens

Question 6

Speech cranial nerves

Answer 6

5 - trigeminal (jaw control)

7 - facial

8 - auditory/vestibulocochlear

9 - glossopharyngeal

10 - vagus (phonation and swallowing)

11 - spinal accessory (braces neck and posture)

12 - hypoglossal (tongue control)

Question 7

Mnemonic

Answer 7

On old Olympus towering tops a Finn and German viewed a horse

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