Brainstem- topography and weigerts

Question 1

What are the cerebral crura?

Answer 1

Two large motor bundles

Question 2

What separates the two cerebral crura?

Answer 2

The interpeduncular fossa

Question 3

What exits the midbrain via the interpeduncular fossa?

Answer 3

The occulomotor nerve

Question 4

Where are the mammillary bodies located?

Answer 4

The interpeduncular fossa

Question 5

What separates the crura from the tegmentum?

Answer 5

The substansia nigra

Question 6

Where is the pretectum located?

Answer 6

Posterior to aqueduct but in front of tectum

Question 7

What do the superior and inferior colliculi contain?

Answer 7

Relay nuclei for the visual and auditory nerve pathways

Question 8

Where does the trochlear nerve exit the midbrain?

Answer 8

Posteriorly, below the inferior colliculus

Question 9

Which cranial nerve exits from the dorsal aspect of the brainstem?

Answer 9

Trochlear nerve

Question 10

What is the main linkage between the cerebrum and the cerebellum?

Answer 10

The pons

Question 11

What connects the pons to the cerebrum?

Answer 11

The middle cerebellar peduncles

Question 12

What is the anterior pons known as?

Answer 12

The basilar pons

Question 13

What is the posterior pons known as?

Answer 13

The tegmentum

Question 14

Where are the superior cerebellar peduncles located?

Answer 14

Lateral to the fourth ventricle

Question 15

What exits the lateral pons?

Answer 15

The trigeminal nerve

Question 16

What do the pyramids of the anterior medulla oblongata contain?

Answer 16

Pyramidal tracts that decussate in the most inferior part of the medulla

Question 17

What are olives?

Answer 17

Ovoid ridges lateral to the pyramids in upper and middle medullas

Question 18

Which nerves exit the brainstem at the pontomedullary junction?

Answer 18

Abducens (CNVI), facial (CNVII), vesitbulocochlear (CNVIII)

Question 19

Which cranial nerves exit the upper medulla posterior to the olives?

Answer 19

Glossopharyngeal (CNIX), vagus (CNX), accessory (CNXI)

Question 20

What do the middle of each crus contain?

Answer 20

Voluntary fibres

Question 21

What do the medial and lateral fifths of each crura contain?

Answer 21

Involuntary fibres

Question 22

Where do the superior cerebellar peduncles decussate?

Answer 22

The lower midbrain

Question 23

Which nerve exits between the pyramids and the olives?

Answer 23

CN XII- hypoglossal

Question 24

What do the inferior cerebellar peduncles link?

Answer 24

The medulla oblongata to the cerebellum

Question 25

Where do the medial lemnisci decussate?

Answer 25

The medulla oblongata

Question 26

What are the medial lemnisci formed from?

Answer 26

Axons of nucleus gracilis and nucleus cuneatus

Question 27

Where do the pyramids decussate?

Answer 27

The lower medulla