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The cuneate fasciculus, fasciculus cuneatus, cuneate tract, (tract of Burdach, named for Karl Friedrich Burdach) is a tract of nerves in the dorsal column of the spinal cord that primarily transmits information from the upper part of the body (the neck, trunk, and arms). It is part of the dorsal column-medial lemniscus pathway.

Cuneate fasciculus
Spinal cord tracts - English.svg
Cuneate fasciculus is labeled in blue at upper right.
Gray672.png
Diagram of the principal fasciculi of the spinal cord.
Details
Identifiers
Latinfasciculus cuneatus medullae spinalis
TAA14.1.02.244
A14.1.04.016
A14.1.04.108
FMA73941
Anatomical terminology

Contents

StructureEdit

The cuneate fasciculus is triangular on transverse section, and lies between the gracile fasciculus and the posterior column, its base corresponding with the surface of the medulla spinalis.

Its fibers, larger than those of the gracile fasciculus, 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.

FunctionEdit

The cuneate fasciculus transmits fine touch, fine pressure, vibration, and proprioception information from spinal nerves located in dermatomes C1 through T6.

NeuronsEdit

The cuneate fasciculus tract is composed of first-order neurons that synapse onto second-order neurons in the brain stem.

The second-order neurons decussate in the brainstem and continue on to the thalamus where the second-order neurons synapse onto third-order neurons.

The third-order neurons carry the received signals to the somatosensory cortex, where the signals, in the form of action potentials, are interpreted.

Additional imagesEdit

See alsoEdit

External linksEdit