Pons Flashcards
(35 cards)
Caudal bondary of the pons marker
2 vestibular areas connecting to one another, line across the 4th ventricle at its widest point.
Rostral bounadary of pons
narrowing of 4th ventricle into cerebral aqueduct
Facial colliculus is composed of
deep to it are abducens nucleus and motor axons from facial nucleus
Where do facial nucleus axons exit the facial colliculus?
over abducens at cerbellar-medullary eangle between pyramids and pons
when do pyramids disappear?
ventral surface transition of medulla to pons
what forms the crus cerebri?
pyramidal tract corticospinal axons
Key charactersitics of transitions of medulla to pons
- vestiibular nuclei appear
2. ICP blends with cerebellum white matter
What can be seen at all levels of pons?
MCP
SCP
Pontine reticular formation
MCP carries
axons from pontine nuclei to cerebellum (opposite side of body). Pontine nuclei get information from cerebral cortex, esp. frontal lobe
Deep cerebellar nuclei are made of what four cells?
Fastigial
Globose
Emboliform
Dentate
Describe SCP path
starts at cerebellum proceeds rostrally and ventrally goes topons tegmentum caudal to the Inferior colliculus
What composes most of the gray matter of the tegmentum? Its function
Pontine reticular formation contributes to sleep, arousal and eye movements
What does the loop of the facial nerve form and what is it called?
forms the bump of the facial colliculus called the genu of the facial nerve
Regions of the RF adjacent to the abducens nerve is responsible for what motor?
orofacial
motor nucleus of 5- mastification
7- smiling, crying
MLF- eye movements
What serotonin producing nucleus is in pons?>
raphe nucleus
function of raphe nucleus
modulating neuron response in hypothalamus and cerebrum
Where do noradranergic neurons involved in autonomic reflexes and pain sensation send projections to ?>
Spinal cord
Name a group of noraderenergic nerons in the rostral pons and caudal midbrain
Locus ceruleus
LC projections include:
sPINAL CORD, CEREBRAL AND CEREBELLAR CORTICES
What is LC important for
vigilance and responsiveness to unexpected stimuli
Auditory axons form what structure in pons?
Lateral lemniscus
Where doe sthe auditory portion of CN 8 synapse?
cochlear nuclei
where do second order neurons of the cochlear nuclei send axons/>
1/2 cross the midline via the medial lemniscus
What does lateral lemniscus carry and terminate?
carry auditory axons from bothe ears and ends on inferior colliculus
