Everything about The Fasciculus Cuneatus totally explained
The
fasciculus cuneatus (
tract of Burdach, named for
Karl Friedrich Burdach) is a bundle of nerves in the spinal cord which primarily transmits information from the arms. It is part of the
posterior column-medial lemniscus pathway.
Physical characteristics
The fasciculus cuneatus is triangular on transverse section, and lies between the
fasciculus gracilis and the
posterior column, its base corresponding with the surface of the
medulla spinalis.
Its fibers, larger than those of the fasciculus gracilis, are mostly derived from the same source, viz., the
posterior nerve roots.
Some ascend for only a short distance in the tract, and, entering the
gray matter, come into close relationship with the cells of the
dorsal nucleus; while others can be traced as far as the
medulla oblongata, where they end in the
gracile nucleus and
cuneate nucleus.
Information transmitted
The Fasciculus cuneatus transmits fine touch, fine pressure, vibration and
proprioception information from
spinal nerves located in
dermatomes C
1 through T
6.
Neurons
The Fasciculus cuneatus tract is composed of 1st order neurons that synapse onto 2nd order neurons in the brain stem.
The 2nd order neurons
decussate in the
brainstem and continue on to the
thalamus where the 2nd order neurons synapse onto 3rd order neurons.
The 3rd order neurons carry the received signals to the
somatosensory cortex where the signals, in the form of
action potentials are interpreted.
Additional images
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