Neuro2 Flashcards
Can a Pineal tumor affect the pons?
No. the pineal body is at the level of the midbrain. The pons is too far caudal to be affected by a pineal tumor
What is primarily contained in the superior cerebellar peduncle?
Efferent projections from the cerebellum
What clinical symptoms would result from damage to the superior cerebellar peduncle?
Cerebellar signs: e.g., intention tremor, dysmetria (lack of coordination of movement)
What is parinaud sundrome?
paralysis of conjugate verticle gaze due to a lesion in the superior colliculi.
This can be due to a pinealoma
Function of superior colliculi
conjugate vertical gaze center
Function of inferior colliculi
auditory
Function of Pineal gland
melatonin secretion, circadian rhythms
Physical exam shows paralysis of upward gaze, bilateral papilledema, and pupils that react to accomodation, but not to direct light. CT scan shows a tumor.
What is this clinical sydrome?
Parinaud’s Syndrome.
The papilledema is do to compression of the cerebral aqueduct by the pinealoma that is causing the syndrome, leading to non-communicating hydrocephalus.
What structures form the cerebellopontine angle?
the cerebellum, upper medulla, and middle cerebellar peduncle.
What nerves pass through the cerebellopontine angle?
CN VII and VIII
facial and vestibulocochlear
What are the most common nerves in the cerebellopontine angle?
acoustic neuromas (80%) and meningiomas (20%)
Result of lesion of the optic tract
Homonymous hemianopia of the contralateral visual field
Result of lesion of the left lateral geniculate nucleus
Right homonymous hemianopia
Result of lesion in the left temporal lobe?
Upper right quadrantinopia
Meyer’s loop is located in the temporal lobe
Result of lesion in the left parietal lobe?
Lower right quadrantinopia
dorsal optic radiation is located in the parietal lobe
Part of the ear supplied: auriculotemporal nerve
anterior half of the external ear canal
Part of the ear supplied: auricular branch of the vagus nerve
posterior half of the external ear canal