The fasciculus cuneatus is the lateral part of the dorsal columns, present only above about T6. It carries fine touch, vibration and position sense from the upper trunk, arms and neck to the nucleus cuneatus in the medulla.
| Location | Lateral part of the posterior funiculus, between the fasciculus gracilis and the dorsal horn, from about T6 up to the medulla |
|---|---|
| Parts |
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| Connections |
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| Blood Supply | Posterior spinal arteries |
Conveys fine touch, vibration and conscious proprioception from the arms, hands, neck and upper trunk on the same side.
Damage to the fasciculus cuneatus causes loss of position sense in the hands, which may show as pseudoathetosis, wandering finger movements when the eyes are closed. Cervical myelopathy and multiple sclerosis can produce the useless hand syndrome by affecting this tract.
Severe clumsiness of a hand with intact strength from loss of proprioception through the fasciculus cuneatus, often in multiple sclerosis or cervical myelopathy.
Involuntary wandering finger movements seen with eyes closed due to loss of position sense from the arm.
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