anatomy : brain stem

Question 1

components of midbrain : nuclei

Answer 1

red nucleus —contains blood vessels and recieves info from cerebr and cerebe

substantia nigria
nuclei of oculomotor and trochlear nerves

Question 2

components of midbrain : tracts

Answer 2

motor and sensory tracts -

cerebral peduncles - the efferent projections include corticobulbar and cortispinal axons

Question 3

corticobulbar axons

cortispinal axons

Answer 3

cortex to brain stem

cortex to spinal cord

Question 4

midbrain anterior and posterior section divided by

Answer 4

cerebral aqueduct

Question 5

The corpora quadrigemina found in midbrain consists of

Answer 5

superior and inferior colliculus

Question 6

function of superior colliculus in midbrain

Answer 6

part of visual system , relaying input from optic tract to the lateral geniculate body

Question 7

function of inferior colliculus in midbrain

Answer 7

part of auditory pathway sends info to medial geniculate body

Question 8

midbrain - the reticular activating system

Answer 8

present throughout brainstem and involved in sleep wake cycles

Question 9

pons : nuclei

Answer 9

• sensory and motor nuclei cranial nerves 5-8
• apneustic and pneumotaxic centres w medulla to maintain respiratory rhythm
• raphe nuclei and recticular act. sys

Question 10

pons : tracts

Answer 10

• sup , middle and inf cerebellar peduncles (process and relay info to/from cerebellum)
• Motor and sensory tracts (sensory fibres post to motors fibres)

-

Question 11

• medulla associated with

- types of nuclei

Answer 11

autonomic control, cranial nerves and motor&sensory relays

-autonomic nuclei , cranial nerve nuclei and relay nuclei

Question 12

medulla : autonomic nulcei

Answer 12

cardiovascular centres : alter rate and force of cardiac contractions , and tone of vascular smooth muslce

Respiratory rhythmicity centers: recieve input from pons

Additional Centers : coughing , sneezing , hiccuping

Question 13

medulla : Sensory & Motor Nuclei of 5 cranial nerves:

Answer 13

8-12

for reference : Vestibular (VIII), Glossopharyngeal (IX), Vagus (X), Accessory (XI), and Hypoglossal (XII)

Question 14

medullary : relay nuclei

Answer 14

nucleus gracilis and nucleus cuneatus : pass somatic sensory info to thalamus

olivary nuclei : relay info from spinal cord , cerebral cortex and brainstem to cerebelluar cortex

Question 15

medullary tracts

Answer 15

ventrally 2 ridges (medullary ridges ) formed by large corticospinal tracts

right above this , most of these fibres cross over

Question 16

Origin of the Cranial Nerves:

which nerve originate in cerebrum

Answer 16

olfactory I

optic II

Question 17

Origin of the Cranial Nerves:

midbrain

Answer 17

trochlear nerve IV …. on post side of midbrain

Question 18

Origin of the Cranial Nerves:

Midbrain-pontine junction

Answer 18

oculomotor III

Question 19

Origin of the Cranial Nerves

PONS

Answer 19

trigeminal V

Question 20

Origin of the Cranial Nerves:

Pontine-medulla junction

Answer 20

abducens VI , facial VII , vestibulocochlear VII

Question 21

Origin of the Cranial Nerves

Medulla oblongata

Answer 21

post to olive : glossopharyngeal, vagus, accessory (IX-XI).

ant : hypoglossal XII