The Brainstem Flashcards Preview

Hugh's MD1 Neuro > The Brainstem > Flashcards

Flashcards in The Brainstem Deck (35):
1

What are the three major fibre tracts of the spinal cord?

Ascending

1. Dorsal column - medial lemnicus system (touch)

2. Anterolateral system (pain)

 

Descending

3. Corticospinal tract 

2

Apart from the face, what else do certain cranial nerve supply?

CN9,10 and 11 also supply visceral, sensory and motor innervation to neck, chest and most of abdominal organs

2

Which CNs exit from the medulla?

9-12

2

Where does decussation occur in the anterolateral system (pain)?

In the spinal cord

3

Are cranial nerve nuclei located in the tectum or tegmentum?

Tegmentum

4

Ancephalic babies, if born, are able to do what?

Swallow, cry, breathe and suckle

5

How is the tegmentum located in relation to the rest of the CNS?

It is the central pathway of the brainstem which is continuous with the spinal cord - everything coming or going to PNS goes through it

5

Where does decussation occur in the corticospinal tract?

Pyramidal decussation

6

Where does decussation occur in the dorsal column tract (touch)

Medial lemniscus of the medulla

 

7

What are 3 parts of the brainstem in decending order?

Midbrain

Pons

Medulla oblongata

7

What is the function of the caudal reticular formation?

Crucial functions in motor reflexes and automonic functions

eg vomiting

8

What embryological feature do the sensory nuclei develop from?

The alar plate

9

What are the general functions of the brainstem?

Reflexive and unconscious behaviour

Modulation of various arousal and conscious states

9

Are the CN motor nuclei located closer or further from the midline cf. to the sensory nuclei?

Motor are closer

Sensory are more lateral

11

How many colliculi are there on the midbrain?

4

12

Where in the brainstem is the reticular formation located?

At all level - also extends rostrally into the thalamus and caudally into the grey matter of the spinal cord

13

What is on the dorsal aspect of the medulla?

Dorsal columns and nuclei

14

What embryological feature do the motor nuclei develop from?

The basal plate

15

Which cranial nerves are a mixture of motor and sensory?

5,7,9,10

16

Where are the cerebral peduncles found?

Ventral aspect of the midbrain

17

Is the recticular formation on the dorsal or ventral aspect?

Dorsal

18

Which cranial nerves exit from the midbrain?

3,4

19

Where do the cranial nerve nuclei lie during development?

Next to the ventricles

21

What is on the ventral aspect of the midbrain?

Cerebral peduncles - motor tract from the motor cortex

22

What is the tectum?

The roof of the midbrain - located superiodorsal

24

T/F the colliculi of the midbrain are located in the tegmentum?

False, they're in the tectum

25

In general, in the brainstem the ventral aspect contains ... while the dorsal aspest contains ...

Motor control tracts

Cranial nerves

26

The basis of the brainstem is important for what?

Descending motor control

28

What the features of the posterior aspect of the pons?

4th ventricle lies on top

Facial colliculi formed by the abducens nucleus and CN7

 

30

Which CNs exit from the pons?

5-8

31

Which cranial nerves exit from above the midbrain

1,2

32

What is the function of the midbrain colliculi?

Eye movement control

Hearing

33

Where in the cranium is the braistem located?

In the posterior cranial fossa

34

Where is the pyramidal decussation found?

At the base of the medulla

35

What are the bumps on the posterior aspect of the midbrain called? 

Colliculi (meaing hills)