Pathways Flashcards
Is the Lemniscal tract motor or sensory?
-Epicritic sensory
Is the Lemniscal tract conscious or unconscious?
-Conscious
Where does the Lemniscal tract begin?
-Dorsal root axons in the spinal cord which enter and rise through the gracile and cuneate fasciculi
Where does the Lemniscal tract end?
- The fasciculi synapse in the medulla at the gracile and cuneate nuclei
- They then cross at the internal arcuate fibers, and become the medial lemniscus.
- The medial lemniscus ascends to the thalamus.
Does the Lemniscal tract cross, and if so, where?
-Yes, at the internal arcuate fibers in the medulla.
What makes up the anterolateral tract?
- Spinothalamic tract
- Spinoreticular tract
- Spinomesencephalic tract
Where does the spinothalamic tract begin?
-Dorsal root axons that synapse immediately at the dorsal horn of the spinal level that they enter at
Where does the spinothalamic tract end?
-After ascending via the anterolateral tract, it terminates at the thalamus on several nuclei (espec. posterior and VPL)
Does the spinothalamic tract cross? If so, where?
-Yes, the majority of neurons cross at the spinal level which they enter.
Is the spinothalamic tract motor or sensory?
-Both conscious and unconscious protopathic sensory from trunk and limbs.
Is the spinoreticular tract motor or sensory?
-Protopathic sensory from the trunk and limbs
Where does the spinoreticular tract begin?
-Dorsal root axons that synapse immediately at the dorsal horn of the spinal level they enter at.
Where does the spinoreticular tract end?
-After ascending via the anterolateral tract, it terminates at the reticular formation
Does the spinoreticular tract cross? If so, where?
-Yes, neurons cross at the spinal level they enter at
Is the spinomesencephalic tract motor or sensory?
-Protopathic sensory from the trunk and limbs
Where does the spinomesencephalic tract start?
-Dorsal root axons of the spinal level at which they enter
Where does the spinomesencephalic tract end?
-After ascending via the anterolateral tract, neurons synapse at the periaqueducatal gray area of the midbrain and superior colliculus.
Does the spinomesencephalic tract cross, and if so, where?
-Yes, neurons cross immediately at the spinal level they enter at.
Is the spinocerebellar tract motor or sensory?
-Sensory regarding position, force production, and movement of limbs
Where does the spinocerebellar tract begin?
- Axons from the lower limb and trunk which ascend from the gracile fasiculus to the nucleus of clark in the thoracic cord.
- Axons from the upper limb and trunk which ascends via the cuneate fascicles to the lateral cuneate nucleus.
Where does the spinocerebellar tract end?
-the cerebellum as either the dorsal spina-cerebellar tract (lower limb and trunk) or the cuneo-cerebellar tract (upper limb and trunk.)
Does the spinocerebellar tract cross, and if so, where?
-No
What are the components of the pyramidal system?
- Cortico-bulbar
- Cortico-pontine
- Cortico-spinal
Does the corticobulbar tract carry motor or sensory info?
-Motor to the head and neck
Where does the corticobulbar tract begin?
-The lobes of the neocortex, primarily frontal and parietal lobes
Where does the corticobulbar tract end?
-Cranial nerve nuclei in the brainstem (11 most caudal)
Does the corticobulbar tract cross, and if so, where?
-Tract does not cross
Does the corticopontine tract cary sensory info or motor info?
-Motor to cerebellum (how the cerebellum gets the plan)
Where does the corticopointine tract start?
-Cortex, primarily frontal and parietal lobes
Where does the corticopontine tract end?
-Pontine nuclei/Cerebellum
Does the corticopontine tract cross, and if so, where?
-Yes, after the synapse at the pontine nuclei
Does the corticospinal tract carry motor or sensory info?
-Motor
Where does the corticospinal tract begin?
-Cortex (frontal and parietal, specifically the motor and premotor areas)
Where does the corticospinal tract end?
-Spinal motor neurons
Does the corticospinal tract cross, and if so, where?
-Yes, caudal medulla
What makes up the extrapyramidal tract?
- Vestibulospinal tract
- Tectospinal tract
- Reticulospinal tract
- Rubrospinal tract
Does the vestibulospinal tract carry sensory info or motor info?
-Motor
Where does the vestibulospinal tract begin?
-Vestibular nucleus
Where does the vestibulospinal tract end?
-Spinal motor neurons
Does the vestibulospinal tract cross, and if so, where?
-Yes, caudal medulla
Does the tectospinal tract carry sensory or motor info?
-Motor
Where does the tectospinal tract begin?
-Tectum
Where does the tectospinal tract end?
-Spinal motor neurons
Does the tectospinal tract cross, and if so, where?
-Yes, caudal medulla
Does the reticulospinal tract carry sensory or motor info?
-Motor
Where does the reticulospinal tract begin?
-Cortex, primarily frontal and parietal lobes, specifically premotor and motor areas
Where does the reticulospinal tract end?
-Spinal motor neurons
Does the reticulospinal tract cross, and if so, where?
-Yes, caudal medulla
Does the rubrospinal tract carry sensory or motor info?
-Motor
Where does the rubrospinal tract begin?
-Red nucleus
Where does the rubrospinal tract end?
-Spinal motor neurons
Does the rubrospinal tract cross, and if so, where?
-Yes, caudal medulla
