What is Spinal Tracts?

The long tracts for clinical practice: dorsal columns, spinothalamic, and corticospinal, where each decussates, and the deficit a lesion gives, in an interactive cord cross-section.

Why does Spinal Tracts matter for clinical practice?

Spinal Tracts is a high-yield board topic; this deep dive walks the pathophysiology, presentation, diagnosis, and management with original clinical vignettes.

Why does Spinal Tracts matter for clinical practice?

Spinal Tracts is a high-yield board topic; this deep dive walks the pathophysiology, presentation, diagnosis, and management with original clinical vignettes.

Spinal Tracts: DCML vs Spinothalamic vs Corticospinal (Medical Education)

Section 1 · The One Rule

One Rule. Every Tract.

If you only remember three things on cord questions, remember these.

The Decussation Cheat

Motor (CST) crosses HIGH at the lower medulla (pyramidal decussation). Lesion above the cross gives contralateral weakness; lesion below gives ipsilateral weakness.

Fine touch / vibration / proprioception (DCML) rides the SAME side all the way up the cord, then crosses HIGH at the medulla (internal arcuate fibers).

Pain / temperature / crude touch (Spinothalamic) crosses LOW within 1 to 2 spinal segments of where it enters. That mismatch with DCML is the engine behind every Brown-Sequard question.

Section 2 · The Cord, Axially

Tap a Tract on the Axial Cord

Cervical-level cross-section. Motor tracts in red and orange. Sensory tracts in blue and purple. Tap any shaded zone to see what it carries, where it crosses, and what falls out when it dies.

Cervical Cord · Axial View

Posterior up · Anterior down · Left = patient's left