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Flashcards in Section 7 Notes Deck (32)
1

What makes up the cerebral peduncle?

the tegmentum and the crus cerebri

2

rostrally the midbrain merges with the ___

thalamus 

3

the boundary between the midbrain and the diencephalon is marked by the ___

posterior commisure

4

the posterior comiisure forms a bridge between

the prectatal areas on each side of the brain stem

5

What can damage the posterior commisure?

Pinealoma

6

Symptoms of a tumor of the pineal gland

1. can't make upward eye movements

2. puts pressure on prectal area --> block the pupillary light reflex --> fixed dilated pupils

3. hydrocephalus if obstructing the cerebral aqeudct

7

what is the vertical gaze center in the prectal area?

the intersitial nucleus in the pretectum

8

what can cause deficits with upward gaze?

1. damage to the nculeus of cajal (vertical gaze center)

2. damage to the posterior commisure (because axons of Nucleus of Cajal pass through here)

9

What is INC?

What sx would you get with a X here?

Interstial gaze center (Nucleus of Cajal)

can't do an upward gaze

10

the lateral lemniscus travels to the ____

inferior colliculus

11

Where do the fibers of the superior cerebellar peduncle cross?

at the level of the midbrain at the decussation of the superior cerebellar peduncle

12

a lesion of the dorsal tegmentum in the midbrain may imapir

propathic (ALS) and epicritic (MLS) from the opposite side of the body and face

13

where in the thalamus do axons from the superior cerebellar peduncle travel to?

VA and VL 

14

where does the rubrospinal tract originate?

the red nucleus

15

Where does the red nucleus project to inth e thalamus?

VA and VL

16

Nuclei in the midbrain

1. the trochlear nucleus

2. occulomotor nucleus

17

the periaqeudctal gray surrounds the ____

cerebral aqeduct

18

Function of the periaqueductal gray?

important for:

1. intiating some sterotyped emotional behaviors (rage)

2. controlling the perception of pain

 

19

why is the substantia nigra black?

because the dopamergic neurons produce melanin

20

Why do loss of dopamergic neurons in the substantia nigra cause parkinsons?

because there is a loss of input to the striatum

21

where do the dopamergic neurons in the reticular formation of the midbrain project to?

the cerebral cortex and to the limbic structures of the forebrain 

22

What cholinergic neurons are important for regualting the sleep wake cycle?

the cholinergic neurons at the pons mibdrian junction

23

What damage in the midbrain can cause coma

X to the rostral region of the reticular formation

-(cholinergic neurons at the pons and midbrain)

24

what does the basal ncuelus of meynert do?

modulates cortical function

25

where is the basal nculeus of meynert located?

deep to the anterior eprforated substance

26

what is the basal nculeus of meynert implicated in?

in alzheimers disease

27

trochlear nerve innervates the ___ muscle

superior oblique

28

how to sx trochlear nerve palsy

if pt looked nasally..

1./ they couldn't look down from that position

2. would also have double vision here in this positon

29

____ innervates the levator palpebrae muscle

occulomotor nerve

30

the Edinger-Westphal nucleus contains preganglionic parasympathetic neurons that project to the ______

ciliary ganglion. 

31

EW to cicilary ganglion pathway is repsonsible for 

1. pupillary constriction

2. thickening of the lens

accomdation with convergence of the pupils

32

what does damage to the edinger westphal nucleus look like?

1. eye is fixed and deviated outward

2. the downward lid droops

3. pupil is dialted

4. pupil is unresponsive to light be shown in the eye