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Encyclopedia > Vestibulospinal tract
Vestibulospinal tract
Vestibulospinal tract is 2c, in red at bottom center.
Diagram of the principal fasciculi of the spinal cord. (Vestibulospinal fasciculus labeled at bottom right.)
Latin tractus vestibulospinalis
Gray's subject #185 760
Dorlands/Elsevier t_15/12817329

The vestibulospinal tract is one of the descending spinal tracts of the ventromedial pathway. It originates from the vestibular nuclei of the medulla, which conducts information from the vestibular labyrinth in the inner ear. Motion of fluid in the vestibular labyrinth activates hair cells that signal the vestibular nuclei via cranial nerve VIII. One part of the vestibulospinal tract project bilaterally down the spinal cord and triggers the cervical spinal circuits, controlling a right position of the head and neck. The second part of the vestibulospinal tract projects ipsilateral down to the lumbar region. There it helps to maintain an upright and balanced posture by stimulating extensor motor neurons in the legs. Image File history File links Download high-resolution version (761x903, 63 KB) [edit] Summary Created with Inkscape by User:Polarlys. ... Image File history File links Gray672. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Elseviers logo. ... The vestibular system, or balance system, is the sensory system that provides the dominant input about our movement and orientation in space. ... Medulla in general means the inner part, and derives from the Latin word for marrow. In medicine it is contrasted to the cortex. ... The vestibular system, or balance system, is the sensory system that provides the dominant input about our movement and orientation in space. ... The inner ear comprises both: the organ of hearing (the cochlea) and the labyrinth or vestibular apparatus, the organ of balance located in the inner ear that consists of three semicircular canals and the vestibule. ... Hair cells are the sensory cells of the auditory system that are found within the cochleas organ of Corti. ... The vestibulocochlear nerve is the eighth of twelve cranial nerves, and also known as the auditory nerve. ... The anatomical planes The anatomical position is a schematic convention for describing the relative morphology of the human body. ... The Spinal cord nested in the vertebral column. ... The anatomical planes The anatomical position is a schematic convention for describing the relative morphology of the human body. ... In vertebrates, motoneurons (also called motor neurons) are efferent neurons that originate in the spinal cord and synapse with muscle fibers to facilitate muscle contraction and with muscle spindles to modify proprioceptive sensitivity. ...


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Neurological background : Descending spinal tracts (425 words)
In the spinal cord, the axons of the lateral corticospinal tract are located internal to the posterior spinocerebellar tract and posterior to the lateral spinothalamic tract.
The axons of the anterolateral corticospinal tract synapse in the ventral horn with second-order neurons.
The neurons of the corticospinal tracts leaving the precentral gyrus and descending in the spinal cord to terminate their course in the ventral horn are called upper motor neurons.
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