21 Descending Motor Systems Flashcards
Localizing Lesions: what do tracts do? Where do they cross? How are they mapped? Tracts Lateral Corticospinal and Corticobulbar Tracts: a 2-3 neuron pathway pathway composed of a large upper motor neuron that synapses onto a lower motor neuron in the spinal chord's ventral horn 1. cortex: pyramidal layer 2. cortex: corona radiata 3. deep cerebrum: internal capsule 4. midbrain: cerebral peduncles 5. pons: corticofugal fibers, basis pontis 6. medulla: pyramid 7. spinal chord (caudal
1
Q
vulernable zone
A
T4-T8
2
Q
ventral spinal chord: arterial supply
A
anterior spinal artery
subclavian>vertebral artery>anterior spinal artery> ventral spinal chord (motor)su
3
Q
dorsal spinal chord: arterial supply
A
posterior spinal artery
subclavian> vertebral artery>basillar>pica> posterior spinal artery
4
Q
radical artery
A
go directly from aorta to spinal chord
5
Q
Artery of Adamkiewicz
A
primary supply for lumbar and sacral spinal chord
6
Q
lateral spinal chord: decussation
A
pyramidal decussation
7
Q
leison: above pyramidal decussation
A
contralateral side
8
Q
lesion: below pyramidal decussation
A
ipsilateral side
