Page 552 - First Aid for the USMLE Step 1 2020, Thirtieth edition [MedicalBooksVN.com]_Neat

508 SecTioN iii Neurology aNd Special SeNSeS ` neurology—AnAtomy And Physiology Neurology aNd Special SeNSeS ` neurology—AnAtomy And Physiology

Spinal cord and Legs (Lumbosacral) are Lateral in Lateral corticospinal, spinothalamic tracts. Thoracic spinal cord
associated tracts section in A .
Dorsal columns are organized as you are, with hands at sides. “Arms outside, legs inside.”

A
Central canal

Dorsal column

Posterior horn Intermediolateral column (sympathetic)
(T1 - L2/L3)
Lateral corticospinal tract
Anterior white commissure

Lateral spinothalamic tract

Anterior spinothalamic tract
Anterior horn

ASCENDING
Dorsal column
(pressure, vibration, fine touch, proprioception)
Central canal
• Fasciculus graciLis (Lower body, legs)
• Fasciculus cUneatus (Upper body, arms)
Posterior horn
Sacral Lumbar
DESCENDING Thoracic Cervical Gray matter
Lateral corticospinal tract Intermediate horn (sympathetic)
(voluntary motor) (T1 - L2/L3)
• Sacral
• Cervical
ASCENDING
Anterior corticospinal tract
(voluntary motor) Lateral spinothalamic tract (pain, temperature)
• Sacral
White matter • Cervical
Anterior spinothalamic tract (crude touch, pressure)
Anterior horn

FAS1_2019_12-Neurol.indd 508 11/8/19 7:39 AM