|
The spinocerebellar tract is a set of axonal fibers originating in the spinal cord and terminating in the ipsilateral cerebellum. This tract conveys information to the cerebellum about limb and joint position (proprioception). ==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 Ib afferent neurons (relatively large, myelinated, quickly conducting). * Muscle spindles fibers are complicated systems of length monitoring within muscles which result in information being carried via Ia neurons (larger and faster than Ib) (from both nuclear bag fibers and nuclear chain fibers) and II neurons (solely from nuclear chain fibers). All of these neurons are "first order" or "primary" and are sensory (and thus have their cell bodies in the dorsal root ganglion). They pass through Rexed laminae layers I-VI of the dorsal horn to form synapses with "second order" or "secondary" neurons in the layer just beneath the dorsal horn (layer VII). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「spinocerebellar tract」の詳細全文を読む スポンサード リンク
|