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Flashcards in Intro into Brainstem Deck (24)
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1

If you see cerebral aquedeuct, what par tof brain are you in?

midbrain

2

if you see 4th ventricle, what part of brain are you in

pons/rostrol medulla (cerebellum behind)

3

if you see central canal, what part of brian are you in

caudal medulla
-continuous w/ the central canal of the cord

4

what is the tectum of the brainstem?
where is it located
what does it contian

lumpy, bumpy back of the midbrain
-in the midbrain, located behind the ventricular space (cerebral aqueduct)
-contains sup and inf colliiculi

5

what doe the tegmentum contain
where is it located in the pons/medulla? in the midbrain?

ascending long tracts
cranial nerve nuclei
reticular formation

-located in the floor of the ventricular spaces: floor of the 4th ventricle in the pons/medulla
-floor of the cerebral aqueduct in midbrain

6

what are the functions of the brainstem

transmission of motor and sensory info
control of cranial nerves (3-12)
control of breathing, heart rate, consciousness (RAS)

7

what happens to a lesion in the pyramidal, medial lemniscus, and spinothalamics tract in the brainstem? what about in the cord?

contral clinical deficits

8

where do afferent cranial nerve fibers start? what do they head towards

start in the periphery and head towards nuclei in the brainstem-they will enter the VENTRAL (usually) aspect of brainstem

9

where do efferent cranial nerve fibers start

start in the brainstem (in CN nuclei) and "exit" the VENTRAL (usually) brainstem towards the head or body

10

where does CN3 exit

the midbrain btwn the crus cerebri of the cerebral peduncles in the interpedunclar fossa

11

where does CN4 exit?

THE EXCEPTION-exits from the dorsal brainstem

12

where does CN 5 exit

exit/enters out laterally in the middle of the pons

13

where does CN 6, 7, 8 exit

pontomedullary junction

14

where does CN 9 and 10 exit

lateral medulla

15

where does CN 12 exit

btwn the pyramids and inf olive

16

cranial nerves exit.....
but the nuclei reside in...

the brainstem ventrally
dorsal tegmentum

17

what are the nerve fibers that columns of nuclei share

discontinuous columns of motor nuclei
continuous columns of sensory nuclei

18

what do cranial nerve nuclei do?
what do some cranial nerves

nucleus: subserves a single sensory or motor task (in column of similar function)
nerves: conveys many tasks (can use nuclei in multiple columns)

19

which are the mixed CN?

5, 7, 9, 10

20

which CN has an additional autonomic component (while still being motor)

CN3

21

what happens in lesions of the reticular formation in the lower brainstem?

fatal since it controls the cardiorespiratory centers (breathing, heart rate, bp)

22

lesions of the reticular formation in the midbrain cause what

coma

23

what is reticular formation in the midbrain

ascending sensory info to stimulate the cerebral cortex and maintain consciousness
-called reticular activating system (RAS)

24

what is reticular formation in the pons and medulla

vital centers for control and cardiac and respiratory