- Spinal Cord 117
Ventral commissure
Peripheral
Nerve
Posterior
column
Gracile &
cuneate nuclei
Anterolateral
system fiber
Lateral
corticospinal
tract
Motor
neuron
Internal arcuate fasciculus
(1PCP)
(2PCP)
(1CST)
Primary sensory cortex
Corticospinal tract
Medial
lemniscus
Thalamus
(2ALS)
(2CST)
Cervico-medullary junction
Primary motor cortex
Anterolateral
system
(1ALS)
Posterior column pathway - PCP
Anterolateral system - ALS
Lateral corticospinal tract - CST
(3 PCP)(3ALS)
Posterior column fiber
(Right)
(Left)
Axon
Posterior
nerve root
Anterior
nerve root
Spinal
nerve
DRAWING 7-4 Major Ascending & Descending Tracts