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Sensory pathways

Sensation

Receptor

First order neuron in

Second order

neuron in

Third order

neuron in

Center

Fine touch

Posterior

nerve root

ganglion

Nucleus gracilis

and

Tactile localization, tactile discrimination, vibratory sensation, stereognosis.

Meissner's corpuscles

and Merkel's

disc

Ganglion –

Fibers form fasciculus

gracilis and fasciculus

cuneatus

Nucleus cuneatus-

Internal arcuate

fibers

Ventral postero-

lateral nucleus

of thalamus

Sensory cortex

Pressure,

crude touch

Pacinian

corpuscle

Posterior

nerve root

ganglion

Chief sensory cells-

Fibers form anterior spinothalamic tract

Ventral postero-

lateral nucleus

of thalamus

Sensory cortex

Temperature

Warmth-

Raffini's

end bulb, cold-Krause's end

bulb

Posterior

nerve root

ganglion

Substantia gelatinosa-Fibers form lateral spinothalamic tract

Ventral postero-

lateral nucleus

of thalamus

Sensory cortex

Conscious kinesthetic sensation

Proprioceptors— muscle spindle, Golgi tendon apparatus, etc.

Posterior

nerve root

ganglion-

-Fibers form fasciculus

gracilis and fasciculus

cuneatus.

Nucleus gracilis and nucleus cuneatus— Internal arcuate

fibers

Ventral postero-

lateral nucleus

of thalamus

Sensory cortex

Subcon-

scious kine-sthetic

sensation

Proprioceptors— muscle spindle, Golgi tendon apparatus, etc.

Posterior

nerve root

ganglion

Clarke's column

of cells and marginal cells— Fibers form

dorsal and ventral spinocerebellar tracts

Cerebel-

lum

Pain

Free nerve

endings

Posterior

nerve root – Ganglion –

Fast pain –

A 5 fibers

Slow pain –

С fibers

Fast pain—marginal

cells in spinal cord.

Slow pain-substantia gelatinosa

Ventral postero-

lateral nucleus

of thalamus.

Reticular forma-

tion and midbrain

Sensory cortex

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