MindTractsDT

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Biological Mind Tracts

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This page is intended to describe set of descending tracts

Tract Details

(generated)

TRACT SET: Descending Tracts


ATS - autonomic tracts system

  • external:
  • synonyms: descending autonomic fibers
  • function:directs activity of glands, smooth muscles, and cardiac muscle
  • generic path: {cortex, HT, AM, RF} -> {sympathetic and parasympathetic}


HTST - hypothalamospinal tract

  • external: http://en.wikipedia.org/wiki/Hypothalamospinal_tract
  • function:control autonomic components
  • comments: descend in dorsolateral funiculus; oculosympathetic pathway; next to superior cervical ganglion to common carotid - internal carotid - long ciliary nerves to pupillary dilator
  • notes to function:
    • descend in dorsolateral funiculus
    • oculosympathetic pathway
    • next to superior cervical ganglion to common carotid - internal carotid - long ciliary nerves to pupillary dilator
  • generic path: {paraventrical nucleus of hypothalamus} -> {IML, sympathetic and parasympathetic preganglionic neurons; ciliospinal center of IML (T1,T2)}


Tract path details:


SSS - solitariospinal system

  • external: http://en.wikipedia.org/wiki/Respiratory_system
  • function:autonomic control of breathing
  • comments: respiratory, vomiting and micturition functions
  • notes to function:
    • respiratory, vomiting and micturition functions
  • generic path: {ventrolateral solitary nucleus, retroambiguus nucleus} -> {diaphragm}


SSET - solitariospinal expiratory tract
  • external: http://en.wikipedia.org/wiki/Ventral_respiratory_group
  • function:facilitate expiratory motor neurons to intercostal muscles
  • comments: nucleus ambiguus - cranial division innervates muscles of the ipsilateral accessory muscles of respiration, principally via the vagus; nucleus retroambiguus - caudal division provides inspiratory and expiratory drive to the motor neurones of the intercostal muscles
  • notes to function:
    • nucleus ambiguus - cranial division innervates muscles of the ipsilateral accessory muscles of respiration, principally via the vagus
    • nucleus retroambiguus - caudal division provides inspiratory and expiratory drive to the motor neurones of the intercostal muscles
  • generic path: {parabrachial nucleus to nucleus ambiguus, nucleus retroambiguus} -> {internal intercostal muscles and abdominal muscles}


Tract path details:


SSIT - solitariospinal inpiratory tract
  • external: http://en.wikipedia.org/wiki/Dorsal_respiratory_group
  • function:facilitate inspiratory motor neurons in phrenic nucleus
  • comments: neck muscles, external intercostal muscles - conscious forced inspiration; pneumotaxic center = medial parabrachial nucleus + kolliker-fuse nucleus, breathing frequency
  • notes to function:
    • neck muscles, external intercostal muscles - conscious forced inspiration
    • pneumotaxic center = medial parabrachial nucleus + kolliker-fuse nucleus, breathing frequency
  • generic path: {kolliker-fuse nucleus, receptors to solitary nucleus} -> {phrenic nucleus, inspiratory; diaphragm}


Tract path details:


ESS - extensor somatic system

  • external:
  • function:control extensor muscles


ACST - anterior corticospinal tract


Tract path details:


MLFS - medial longitudinal fasciculus system

  • external: http://en.wikipedia.org/wiki/Medial_longitudinal_fasciculus
  • function:connects the cranial nerve nuclei III (oculomotor nerve), IV (trochlear nerve) and VI (abducens nerve) together, and integrates movements directed by the gaze centers (frontal eye field) and information about head movement (from cranial nerve VIII, vestibulocochlear nerve)
  • comments: connects together III, IV, and VI; integral component of saccadic eye movements as well as vestibulo-ocular and optokinetic reflexes; tectospinal and vestibulospinal
  • notes to function:
    • connects together III, IV, and VI
    • integral component of saccadic eye movements as well as vestibulo-ocular and optokinetic reflexes
    • tectospinal and vestibulospinal
  • generic path: {vestibular nucleus} -> {}


TCST - tectospinal tract
  • external: http://en.wikipedia.org/wiki/Tectospinal_tract
  • function:mediate reflex postural movements of head in response to visual and auditory stimuli
  • comments: extrapyramidal; in response to bright and sudden movements and loud noises
  • notes to function:
    • extrapyramidal
    • in response to bright and sudden movements and loud noises


Tract path details:

  • path TCST.DEEP: coordinates head and eye movements; mediate reflex postural movements of head in response to visual stimuli (from deep layers of the superior colliculus; projects to contralateral and ipsilateral portion of first cervical neuromeres of spinal cord, oculomotor and trochlear nuclei and abducens nucleus) - Deep Superior Colliculus,LRC.MM.SC.DEEP -> Spinal Accessory Nucleus,LPC.SC.VH.SAN
  • path TCST.INT: coordinates head and eye movements; mediate reflex postural movements of head in response to auditory and somatosensory stimuli (from intermediate layers of the superior colliculus; projects to contralateral and ipsilateral portion of first cervical neuromeres of spinal cord, oculomotor and trochlear nuclei and abducens nucleus) - Deep Superior Colliculus,LRC.MM.SC.DEEP -> Spinal Accessory Nucleus,LPC.SC.VH.SAN


VST - vestibulospinal tract
  • external: http://en.wikipedia.org/wiki/Vestibulospinal_tract
  • function:alter muscle tone, extend, and change position of limbs and head with goal of supporting posture and maintaining balance of body and head; maintain balance and to stabilize the visual image on the retina during head movements
  • comments: extrapyramidal; proximal muscles, postural control; activates extensors, inhibits flexors; vestibular nuclei receive their primary input from the vestibular portion of C.N. VIII - vestibular-auditory
  • notes to function:
    • extrapyramidal
    • proximal muscles, postural control
    • activates extensors, inhibits flexors
    • vestibular nuclei receive their primary input from the vestibular portion of C.N. VIII - vestibular-auditory


LVST - lateral vestibulospinal tract
  • external: http://en.wikipedia.org/wiki/Lateral_vestibulospinal_tract
  • function:maintain an upright and balanced posture by stimulating extensor motor neurons in legs
  • comments: also innervates muscles of the trunk, thus additionally aiding in body posture; lateral vestibular nuclei receive input from cerebellum
  • notes to function:
    • also innervates muscles of the trunk, thus additionally aiding in body posture
    • lateral vestibular nuclei receive input from cerebellum
  • generic path: {lateral vestibular nucleus; additional input from superior and inferior vestibular nuclei} -> {extensor muscles of legs}


Tract path details:


MVST - medial vestibulospinal tract
  • external: http://en.wikipedia.org/wiki/Medial_vestibulospinal_tract
  • function:controls position of the head, neck, and eyes in response to changes in posture
  • comments: controlling lower motor neurons associated with the spinal accessory nerve - CN XI; additionally, projects superiorly to the paramedian pontine reticular formation, indirectly innervating the nuclei of CN VI and III
  • notes to function:
    • controlling lower motor neurons associated with the spinal accessory nerve - CN XI
    • additionally, projects superiorly to the paramedian pontine reticular formation, indirectly innervating the nuclei of CN VI and III
  • generic path: {medial vestibular nucleus} -> {spinal accessory nucleus, paramedian pontine reticular formation; found only in cervical spine and above}


Tract path details:


RTSS - reticulospinal system

  • external: http://en.wikipedia.org/wiki/Reticulospinal_tract
  • function:locomotion and postural control
  • comments: extrapyramidal; proximal muscles, postural control; integrates information from the motor systems to coordinate automatic movements of locomotion and posture; facilitates and inhibits voluntary movement; influences muscle tone; mediates autonomic functions; modulates pain impulses; influences blood flow to lateral geniculate nucleus of the thalamus
  • notes to function:
    • extrapyramidal
    • proximal muscles, postural control
    • integrates information from the motor systems to coordinate automatic movements of locomotion and posture
    • facilitates and inhibits voluntary movement
    • influences muscle tone
    • mediates autonomic functions
    • modulates pain impulses
    • influences blood flow to lateral geniculate nucleus of the thalamus


MRST - medullary reticulospinal tract
  • external:
  • synonyms: lateral reticulospinal tract
  • function:inhibiting excitatory axial extensor muscles of movement
  • generic path: {Gigantocellular Reticular Nucleus} -> {extensor muscles, all levels of spinal cord}


Tract path details:


PRST - pontine reticulospinal tract
  • external:
  • synonyms: medial reticulospinal tract
  • function:exciting anti-gravity, extensor muscles; mediate postural adjustments in response to startling stimuli
  • generic path: {Pontine Reticular Formation } -> {extensor muscles, all levels of spinal cord}


Tract path details:


FSS - flexor somatic system

  • external:
  • function:control flexor muscles


CBT - corticobulbar tract

  • external: http://en.wikipedia.org/wiki/Corticobulbar_tract
  • function:carrying the motor function of the non-oculomotor cranial nerves
  • comments: V, VII, XI, and XII; indirectly - via IX and X in nucleus ambiguus
  • notes to function:
    • V, VII, XI, and XII
    • indirectly - via IX and X in nucleus ambiguus


Tract path details:


LSTT - lateral corticospinal tract

  • external: http://en.wikipedia.org/wiki/Lateral_corticospinal_tract
  • function:flexor motor, pyramidal tract, conscious; volitional skilled motor activity
  • comments: 90 percents of corticospinal fibers; 80 percents - contrallateral; 10 percents - unilateral; cervical-medial, thoracic, lumbar-lateral, distal muscles, decussating to contralateral and ipsilateral
  • notes to function:
    • 90 percents of corticospinal fibers
    • 80 percents - contrallateral
    • 10 percents - unilateral
    • cervical-medial, thoracic, lumbar-lateral, distal muscles, decussating to contralateral and ipsilateral
  • generic path: {cortex BA 1-4,6} -> {muscle groups that require concentration and conscious thought to control; upper limb digits}


Tract path details:


RBST - rubrospinal tract

  • external: http://en.wikipedia.org/wiki/Rubrospinal_tract
  • function:mediation of voluntary movement, upper limbs; control of flexor tone
  • comments: extrapyramidal; activates flexors, inhibits extensors; pattern locomotion, inhibit reflex activity in spinal cord; terminate into dorsal horn and in the intermediate region of the ventral horn; fibers terminated in contralateral laminae 5, 6, and the dorsal part of lamina 7 at all spinal cord levels
  • notes to function:
    • extrapyramidal
    • activates flexors, inhibits extensors
    • pattern locomotion, inhibit reflex activity in spinal cord
    • terminate into dorsal horn and in the intermediate region of the ventral horn
    • fibers terminated in contralateral laminae 5, 6, and the dorsal part of lamina 7 at all spinal cord levels


Tract path details:

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