Spinocerebellar tracts
set of axonal fibers originating in the spinal cord and terminating in the ipsilateral cerebellum
The spinocerebellar tracts are nerve tracts originating in the spinal cord and terminating in the same side (ipsilateral) of the cerebellum. The two main tracts are the dorsal spinocerebellar tract, and the ventral spinocerebellar tract. Both of these tracts are located in the peripheral region of the lateral funiculi (white matter columns). Other tracts are the rostral spinocerebellar tract, and the cuneocerebellar tract (posterior external arcuate fibers).
They carry proprioceptive, and cutaneous information to the cerebellum, where movement can be coordinated.
Origins of proprioceptive information
Proprioceptive information is obtained by Golgi tendon organs and muscle spindles.
Golgi tendon organs consist of a fibrous capsule enclosing tendon fascicles and bare nerve endings that respond to tension in the tendon by causing action potentials in type Ib afferents. These fibers are relatively large, myelinated, and quickly conducting.
Muscle spindles monitor the length within muscles and send information via faster Ia afferents. These axons are larger and faster than type Ib (from both nuclear bag fibers and nuclear chain fibers) and type II afferents (solely from nuclear chain fibers).
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