Lab 4: Brainstem

Question 1

What types of info do dorsal columns (fasciculus gracilis/cuneatus) carry?

Answer 1

discriminative touch + propioception

Question 2

What are the distinguishing structures of the caudal medulla?

Answer 2

crossing fibers (pyramidal decussation) of corticospinal tracts

Question 3

What is the appearance of the ventricular system in the caudal medulla?

Answer 3

central canal

Question 4

What are the distinguishing features of the rostral medulla?

Answer 4

olives on lateral medulla + caudal portion of 4th ventricle

Question 5

What is the appearance of the ventricular system in the rostral medulla?

Answer 5

transition between 4th ventricle and central canal

Question 6

What are the distinguishing features of the middle pons?

Answer 6

cerebellar peduncles, descending fibers of corticospinal fascicles + crossing fibers to cerebellum

Question 7

What are the distinguishing features of the midbrain?

Answer 7

cerebral peduncles, substantia nigra, red nuclei, cerebral aqueduct, periaqueductal gray + colliculi

Question 8

Which cranial nerves have a parasympathetic function?

Answer 8

III, VII, IX, X

Question 9

Where are the cell bodies of MNs for spinal nerves and CNs located?

Answer 9

spinal nerves -> SC anterior horn
CNs -> brainstem nuclei

Question 10

Where are the cells bodies of sensory neurons for spinal and CNs located?

Answer 10

spinal nerves -> dorsal root ganglia
CNs -> brainstem ganglia, except CN V sensory fibers

Question 11

What are some of the motor nuclei found in the brainstem?

Answer 11

oculomotor, trochlear, trigeminal, facial, abducens, hypoglossal, spinal accessory

Question 12

What are the sensory nuclei found in the brainstem?

Answer 12

trigeminal, vestibular, dorsal + ventral cochlear, nucleus solitaris

Question 13

What are the levels of the brainstem?

Answer 13

midbrain, pons, medulla

Question 14

What are the regions of the brainstem?

Answer 14

tectum, tegmentum, basis

Question 15

What cranial nerve has a level of cerebrum?

Answer 15

CN I

Question 16

What cranial nerve has a level of diencephalon?

Answer 16

CN II

Question 17

What cranial nerves have a level of midbrain?

Answer 17

CN III, CN IV

Question 18

What cranial nerve has a level of pons

Answer 18

CN V

Question 19

What cranial nerves have a level of pontomedullary junction?

Answer 19

CN VI, CN VII, CN VIII

Question 20

What cranial nerves have a level of medulla?

Answer 20

CN IX, CN X, CN XII

Question 21

What cranial nerve has a level of medulla and spinal cord?

Answer 21

CN XI

Question 22

What cranial nerve exits dorsally in the brainstem?

Answer 22

CN IV