A. Fasciculus gracilis

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A. Fasciculus gracilis
B. Fasciculus cuneatus
Thalamic radiations to lower limb area of
postcentral gyrus
Thalamic radiations to upper limb area of
postcentral gyrus
Dorsal columns convey well-localized touch,
pressure and vibratory sense from legs
(fasciculus gracilis) and arms (fasciculus
cuneatus)
Third order neuron in ventral postero-lateral
nucleus of thalamus
Third order neuron in ventral postero-lateral
nucleus of thalamus
Second order fibers in dorsolateral part of
medial lemniscus in pons midbrain
Second order fibers in ventromedial part of
medial lemniscus in pons midbrain
Synapse with second order neuron in the cuneate
nucleus
Second order fibers in dorsal part of medial
lemniscus in medulla
Second order fibers in ventral part of medial
lemniscus in medulla
Synapse with second order neuron in the gracile
nucleus
Internal arcuate fibers are second order fibers
that decussate
Internal arcuate fibers are second order fibers
that decussate
First order fiber ascends spinal cord in
fasciculus cuneatus
First order fiber ascends spinal cord in
fasciculus gracilis
First order neuron in cervical dorsal root
ganglion
Cervical cord
First order neuron in lumbar dorsal root ganglion
Lumbar cord
Fig. 12