Blood supply to Tracts Flashcards
What artery supplies the ALS tract in the midbrain?
Medial choroidal A.
What artery supplies the ALS tract in the rostral pons?
Basilar A. branches and the Superior Cerebellar A.
What artery supplies the ALS tract in the caudal pons?
Basilar A. branches and the AICA - Anterior Inferior Cerebellar A.
What artery supplies the ALS tract in the medulla?
PICA - Posterior Inferior Cerebellar A.
Results of an occlusion of the Anterolateral tract/Spinothalamic tract in the brainstem?
CONTRALATERAL loss of pain/nociception, temperature and non-discriminative touch
What artery supplies the ALS in the spinal cord?
Arterial Vasocorona and the Anterior Spinal A.
Results of an occlusion of the Anterolateral tract/Spinothalamic tract in the spinal cord?
Patchy CONTRALATERAL loss of pain/nociception, temperature and non-discriminative touch starting 2 segments BELOW occlusion
What artery supplies the Medial Longitudinal Fasciculus (MLF) most of the time in the brainstem?
Paramedian branches of the basilar A.
What is the blood supply to the CST in the pons and rostral medulla?
Basilar A. and some of its branches
Where does the CST fibers cross?
Pyramids of medulla (caudal)
Where does the ALS fibers cross?
Anterior white commissure at the level they enter the posterior horn of the SC
Results of a lesion to the CST?
CONTRALATERAL spastic paralysis, babinski’s sign, hyperreflexia
Results of a lesion to the LCST?
IPSILATERAL paralysis of distal limb musculature
Results of a unilateral MLF lesion?
CONTRALATERAL horizontal gaze disturbance
- Ipsilateral eye unable to ADDuct
- Contralateral eye has nystagmus
Internuclear Opthalmoplegia
What is the blood supply to the spinal trigeminal nucleus in the medulla?
PICA
Results of a spinal trigeminal nucleus/tract lesion in the medulla or pons?
IPSILATERAL loss of pain and temp. from the face
What will lateral medullary/lateral pontine syndrome most likely affect the most?
ALS and spinal trigeminal nucleus
Damage to the spinal trigeminal tract?
Onion-peel sensory loss
Occlusion of ______ gives lateral medullary syndrome?
PICA
Deficits seen with lateral medullary syndrome?
ALS - contralateral loss of pain and temp
Ipsilateral loss of pain and temp from the face
Dissociated sensory loss
Loss of one sensory modality but another is within normal limits
Occlusion of _____ gives lateral pontine syndrome?
Long circumferential branches of basilar and
i) if rostral = superior cerebellar
ii) if caudal = AICA
Deficits seen with lateral pontine syndrome?
ALS - contralateral loss of pain and temp
Ipsilateral loss of pain and temp from the face
Disturbed horizontal gaze – PPRF
Ipsilateral trigeminal anesthesia and contralateral spastic hemiplegia
Alternating trigeminal hemiplegia
What is destroyed with alternating trigeminal hemiplegia
Spinal trigeminal nucleus and CST fibers
What artery supplies the medial lemniscus in the medulla?
Anterior spinal A.
What tracts are found laterally?
ALS, Spinal trigeminal tract/nucleus
What tracts are found medially?
Medial lemniscus, MLF, CST
What cranial nerves are found medially?
3, 4, 6, 12
What is often also seen with lateral medullary syndrome along with damage to ALS and spinal nucleus?
Damage to nucleus ambiguus - hoarse voice
