vascular brainstem syndrome Flashcards
the vertebral arterires supply the
brainstem and portions of diencephalon.
from the ventral view the vertebral arteries travel
within the subarachnoid space, paralleling the pyramids of the medulla.
each vertebral artery emit
a posterior spinal artery
posterior spinal artery travels
dorsally to supply the dorsal columns of the medulla before decending to exit the skull and supply the dorsal spinal cord.
vertebral arteries emit second
the anterior spinal arteries
the anterior spinal arteries unify
along the midline before exiting the skull to supply the ventral spinal cord.
verterbral arteries emit third
the posterior inferior cerebellar arteries
the posterior inferior cerebellar travel
laterally then dorsally to enter the fourth ventricle and forament of magendie and also supply the inferior cerebellar peduncle and the posterior and inferior cerebellar hemispheres
posterior inferior cerebellar can also be the source of
the posterior spinal artery
the verterbral arteries unify near
the juntion of the medulla and pons.
anterior inferior cerebellar artery arises from basilar near
the roots of craniel nerve VI and travel laterally along the pontomedullary junction reaching the cerebello pontine angle in route to the foramina of luscka and lateral fourth ventricle, middle cerebellar peduncles and anterior and inferior portions of the cerebellar hemisphere.
either the basilar or the anteiror inferior cerebellar artery will emit
a labryinthe artery that travels laterally to follow cranial nerves VII and VIII to inner ear.
basialr supplies the
pons and cerebellar peduncles
at the junction of the pons and midbrain the basialr artery emits
the superior cerebellar arteries
the superior cerebellar arteries supply the
superior cerebellar peduncles the caudal mid brain and the superior vermis and hemispheres of the cerebellum
the posterior cerebral artery arises
just rostral to cranil nerve II
posterior cerebral artery travels
laterally and dorsally
posterior cerebral artery supplies the
midbrain, third and lateral ventricles, the thalamus and epithalamus.
Medial medullary syndrome
anterior spinal artery –Contralateral paresis:pyramid –contralateral somatosensory loss(DCML):medial leminiscus –ipsilateral weakness of the hypoglossal nerve
Lateral meduallry syndrome
Posterior inferior cerebellar artery –ipsilateral facial anesthesia/thermanesthesia:spinal nucleus and tract of trigeminal nerve –contralateral anteshtesia/thermanesthesia:ALS –vertico and ocular disturbances:vestibular nuclei –Dysphagia/Dysarthria: efferents of the nucleus ambiguus –ipsilateral ataxia: inferior cerebellar peduncle –ipsilateral horner syndrome
Pons-Locked in syndrome
bilateral involvement of the ventromedial basilar branches –bilateral paralysis often awith preservation of vertical movements of the eyes and opening of the eyelids: inframesencephalic corticospinal and corticobulbar fibers plus cranil nerve VI(sensory may be spared
Midbrain-Weber syndrome arteries
paramedian branches of basilar bifurcation, proximal branches of the psoterior cereberal arteris, short circumferential branches of the posteror medial choroidal and quadrigeminal arteries.
Weber syndrome symptoms
Contralateral paresis often greater in upper body: cotrical spinal fibers –ipsilateral deviaton of the eyes:corticobulbar fibers –contralateral lower facial paresis: corticobulbar fibers –contralateral lingaual paresis: corticobulbar fibers –ipsilateral opthalmoplegia: CN III
Claude syndrome artery
paramedian branches of the basilary pifurcation, proximal branches of the posterior cerebral arteries, short circumferential branches of the posterior medial choroidal and quadrigeminal arteris
Claude syndrome symptoms
–ipsilateral opthalmoplegia: CN III – contralateral postrual instability: red nucleus
