QS Study

The tract of Fasciculus Cuneatus and Burdach

Fasciculus Cuneatus and Burdach are a continuation of the dorsolateral column of the spinal cord into the medulla oblongata. It is a tract of nerves in the dorsal column of the spinal cord that primarily transmits information from the upper part of the body, ex., the neck, trunk, and arms. They are made up mainly of the axons of the bipolar cells of the posterior root ganglia of the spinal nerves.

Location

In the posterior funiculus of the white matter of spinal cord. It is responsible for transmitting vibration, conscious proprioception, and fine touch sensations from the upper body.

Extention

  • The tract of Gall extends throughout the cord.
  • Tract at Burdach extends only above the mid-thoracic level.

Fig: Fasciculus Cuneatus and Burdach

Origin

  • The tract of Gall and Burdach are formed by the axons of the pseudounipolar cells of the dorsal not ganglia.
  • The tract of Gall contains the long ascending fibers from the sacral, lumbar and lower six thoracic spinal nerves.
  • The tract of Burdach contains the long ascending fibers from the upper six thoracic and all the cervical spinal nerves.

Course

  • Dorsal root ganglia (1st order neuron),
  • Entering into the spinal cord,
  • Ascend ipsilaterally and terminate by synapsing, on the nucleus gacilis (Gall) and nucleus cuneatus (Burdach).
  • Internal arcuate fiber (axons of nucleus gracilities and cuneatus) (2nd order neuron).
  • Fibers cross the median plane.
  • Ascend as medial lemniscus through the medulla, pons, and midbrain.
  • Ventral posterolateral nucleus of thalamus (3rd order neuron begins).
  • Axons pass through posterior limb of the internal capsule.
  • Corona radiate.
  • Somesthetic area of the postcentral gyrus of the cerebral cortex.