Exam #3: Organization of the Brainstem Flashcards Preview

Neuroanatomy > Exam #3: Organization of the Brainstem > Flashcards

Flashcards in Exam #3: Organization of the Brainstem Deck (24):
1

What is the only pure sensory CN nucleus located in the brainstem?

CN VIII

2

What is the importance of the sulcus limitans?

This is the anatomic demarcation of motor & sensory function:
- Medial= motor
- Lateral= sensory
- Intermediate= both

3

Embryologically, what structure are the sensory nuclei derived from?

Alar plate

4

Embryologically, what structure are the motor nuclei derived from?

Basal plate

5

What cell type lines the ventricular system/ central canal?

Ependymal

6

What is the mylencephalon?

Medulla

7

What is the landmark for the rostral medulla?

Open 4th ventricle

8

What is the significance of the open 4th ventricle in the medulla, from an embryological standpoint?

Formation of the 4th ventricle causes the sensory nuclei to transition from a dorsal position to a dorsolateral position

9

What is the mesencephalon?

Midbrain

10

What is the metencephalon?

Cerebellum & pons

11

What are the landmarks for the caudal medulla?

Caudal= closed 4th ventricle
- Olivary nuclei
- Pyramids

12

What long tracts are contained in the pyramids of the medulla?

Corticospinal tract

13

What is the function of the corticospinal tracts?

Motor output (UMN)

14

What is the function of the medial lemniscus?

Proprioception & discriminative touch

15

What are the internal arcuate fibers associated with?

DC/ML

*These are the fibers that cross from the DC to the ML

16

What does the open 4th ventricle signify on cross-section?

Rostral medulla

17

What are the landmarks for the caudal pons?

Basis pontis
Open 4th ventricle
Cerebellum

18

What is the landmark for the caudal midbrain?

SCP decussation

19

What CN nuclei is associated with the caudal midbrain?

Trochlear

20

What is the landmark for CN IIII?

Red nucleus

21

Where do the pyramids decussate?

Caudal medulla (spinomedullary junction)
- Lateral cross
- Anterior don't

22

Where does the spinothalamic tract cross?

At the spinal level innervated

23

Where does the DC/ML decussate?

Caudal medulla via the internal arcuate fibers

24

What is the function of the solitary nucleus?

Taste from CN X, IX, & VII

Thus, it is in the medulla ( CN IX & X) and the pons (VII)