Propriospinal tracts are three
tracts
Tract may refer to:
Geography and real estate
* Housing tract, an area of land that is subdivided into smaller individual lots
* Land lot or tract, a section of land
* Census tract, a geographic region defined for the purpose of taking a census
...
, collections of
nerve fiber
An axon (from Greek ἄξων ''áxōn'', axis) or nerve fiber (or nerve fibre: see spelling differences) is a long, slender projection of a nerve cell, or neuron, in vertebrates, that typically conducts electrical impulses known as action pot ...
s ascending, descending, crossed and uncrossed, that interconnect various levels of the
spinal cord
The spinal cord is a long, thin, tubular structure made up of nervous tissue that extends from the medulla oblongata in the lower brainstem to the lumbar region of the vertebral column (backbone) of vertebrate animals. The center of the spinal c ...
. They are located in the white columns (
funiculi) of the spinal cord where the columns meet the spinal central gray. Shorter fibers are located closer and longer fibers further from the gray. The tracts include the
ventral propriospinal tract, the
lateral propriospinal tract and the
dorsal propriospinal tract. Some authors include the semilunar tract in this category. A few other fibers intrinsic to the cord run in the dorsolateral
fasciculus
''Fasciculus vesanus'' is an extinct species of stem-group ctenophores known from the Burgess Shale of British Columbia, Canada. It is dated to and belongs to middle Cambrian strata.
The species is remarkable for its two sets of long and sho ...
of the spinal cord and the septomarginal tract.
References
External links
* More information a
BrainInfo
Spinal cord tracts
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