Embedded Files
Tract
Info. Conveyed
1° → 2° Order Neuron
Crossed
3° Order Neuron
Termination
Dorsal column–medial lemniscus
Two-point touch, light touch, joint position sense, vibration, pressure
Dorsal root ganglia (DRG) → Gracilis and cuneate nuclei
Yes; internal arcuate fibers (in medulla)
Ventral posterior (lateral) nucleus of thalamus (VPL)
Postcentral gyrus and paracentral lobule (posterior part)
Feature
- Convey Fine Touch, vibration, and proprioception
- Posterior intermediate septum starts at T6, divides the fasciculus gracilis and cuneatus
- Most lower limb group I afferent fibers go to Clarke’s column and the dorsal spinocerebellar tract, not the fasciculus gracilis and posterior columns.
- Lower limb fibers are medial.
- Note: group Ia (muscle spindles), Ib (Golgi tendon organs)
- Descending fibers in the posterior column go to layer VI.
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