Caption2 = Diagram of the principal fasciculi of the spinal cord. |
Caption2 = Diagram of the principal fasciculi of the spinal cord. |
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Precursor = |
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DorlandsSuf = 12355858 |
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The '''fasciculus cuneatus''' ('''tract of Burdach''', named for [[Karl Friedrich Burdach]]) is triangularontransverse section, andliesbetween the [[fasciculusgracilis]]andthe[[posteriorcolumn]],itsbasecorrespondingwiththesurface of the [[medullaspinalis]].
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The '''fasciculus cuneatus''' ('''tract of Burdach''', named for [[Karl Friedrich Burdach]]) is abundleofnervesin the spinalcordwhichprimarilytransmitsinformationfromthearms.Itispart of the [[posterior column-mediallemniscus pathway]].
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==Physical characteristics==
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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]].
Its fibers, larger than those of the fasciculus gracilis, are mostly derived from the same source, viz., the [[posterior nerve roots]].
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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]] and [[cuneate nuclei]].
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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]].
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TheFasciculus cuneatus transmits fine touch, fine pressure, vibration and proprioception information from spinal nerves located in dermatomes C<sub>1</sub> through T<sub>6</sub>. 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.
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==Informationtransmitted==
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The Fasciculus cuneatus transmits fine touch, fine pressure, vibration and [[proprioception]] information from [[spinal nerve]]s located in [[dermatome]]s C<sub>1</sub> through T<sub>6</sub>.
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==Neurons==
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The Fasciculus cuneatus tract is composed of 1st order neurons that synapse onto 2nd order neurons in the brain stem.
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The 2nd order neurons [[decussate]] in the [[brainstem]] and continue on to the [[thalamus]] where the 2nd order neurons synapse onto 3rd order neurons.
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The 3rd order neurons carry the received signals to the [[somatosensory cortex]] where the signals, in the form of [[action potential]]s are interpreted.
==Additional images==
==Additional images==
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| [[Image:Gray792.png|thumb|Upper part of medulla spinalis and hind- and mid-brains; posterior aspect, exposed in situ.]]
| [[Image:Gray792.png|thumb|Upper part of medulla spinalis and hind- and mid-brains; posterior aspect, exposed in situ.]]
The Fasciculus cuneatus transmits fine touch, fine pressure, vibration and proprioception information from spinal nerves located in dermatomes C1 through T6.
Edit
Added by Dr Joe Kiff
Added by PhloxBot
