- Medial vestibulospinal tract
Brain: Medial vestibulospinal tract Vestibulospinal tract is 2c, in red at bottom center. Diagram of the principal fasciculi of the spinal cord.
The medial vestibulospinal tract is one of the descending spinal tracts of the ventromedial pathway.
The medial part of the vestibulospinal tract is the smaller part, and is primarily made of fibers from the medial vestibular nucleus. It projects bilaterally down the spinal cord and triggers the ventral horn of the cervical spinal circuits, particularly controlling lower motor neurons associated with the spinal accessory nerve (CN XI). Additionally, the pathway projects superiorly to the paramedian pontine reticular formation, indirectly innervating the nuclei of CN VI and III. Through this superior projection, the medial vestibulospinal tract is involved in "yoking" the eyes together in response to rapid movement of the head. Thus, cumulatively it controls position of the head, neck, and eyes in response to changes in posture.
Anatomy of torso (primarily): the spinal cord (TA 14.1.02, GA 9.749) External, dorsalPosterior median sulcus · Posterolateral sulcus Grey matter/
Rexed laminaeI–VI: Posterior hornVII: Lateral hornVIII–IX: Anterior hornX: OtherCentral gelatinous substance · Gray commissure
External, ventralAnterior median fissure · Anterolateral sulcus External, general Human brain, rhombencephalon, metencephalon: pons (TA A14.1.05.101–604, GA 9.785) Dorsal/
(tegmentum)SurfaceWhite: Sensory/ascendingWhite: Motor/descendingOther grey
(base)White: Motor/descendingSurfaceBasilar sulcus
Other grey: Raphe/
Brain and spinal cord: neural tracts and fasciculi Sensory/
ascending3°: → Posterior limb of internal capsule → Postcentral gyrusFast/lateralSlow/medial
descendingPyramidalMidbrain tectum → Tectospinal tract → muscles of neck
direct: 1° (Motor cortex → Striatum) → 2° (GPi) → 3° (Lenticular fasciculus/Ansa lenticularis → Thalamic fasciculus → VL of Thalamus) → 4° (Thalamocortical radiations → Supplementary motor area) → 5° (Motor cortex)
indirect: 1° (Motor cortex → Striatum) → 2° (GPe) → 3° (Subthalamic fasciculus → Subthalamic nucleus) → 4° (Subthalamic fasciculus → GPi) → 5° (Lenticular fasciculus/Ansa lenticularis → Thalamic fasciculus → VL of Thalamus) → 6° (Thalamocortical radiations → Supplementary motor area) → 7° (Motor cortex)nigrostriatal pathway: Pars compacta → Striatum
CerebellarAfferentEfferentFastigial nucleus in Flocculonodular lobe/vestibulocerebellum → Vestibulocerebellar tract → Vestibular nucleusBidirectional:
Auditory and vestibular pathways Auditory VestibularVestibulo-oculomotor fibers
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