Motor System - Pyramidal & Extrapyramidal tracts

Descending pathways from the motor tracts

It is divided as 

1. Pyramidal tracts
2. Extrapyramidal tracts

Pyramidal tracts or Corticospinal tracts

Origin

• Arise from the pyramidal cells in the motor area (4), premotor area (6) and frontal eye field (8).
• It also gets fibers from the sensory area (3,1,2)

Course

Termination

• End on the anterior horn cell of the spinal cord.
• Some fibers give collateral to cranial nerve nucleus which are called corticonuclear fibers

Upper Motor Neuron

• From cerebral cortex to anterior horn cells of spinal cord.

Lower Motor Neuron

• From anterior horn cell to the effector organ.