L7: Motor Cortex and Voluntary movements

Question 1

Where do 90% of corticospinal axons cross? Where do they travel after that?

Where fo the other 10% go?

Answer 1

At the pyramidal decussation and then travel in the lateral corticospinal tract

They remain ipsilateral and project to both sides in the medial motor neurons

Question 2

Where do the subcortical motor projections come from?

Answer 2

• Reticular formation
• Vestibular Nuclei (medial and lateral)
• Red nucleus