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Questions and Answers
Where are the cell bodies located for the axons that carry up the spinal cord within the Fasciculus Gracilis?
Where are the cell bodies located for the axons that carry up the spinal cord within the Fasciculus Gracilis?
- Gracile Nucleus
- Spinal Cord
- Cuneate Nucleus
- Dorsal Root Ganglion (DRG) (correct)
Which part of the body has the most lateral axons in the spinal cord according to somatotopic arrangement?
Which part of the body has the most lateral axons in the spinal cord according to somatotopic arrangement?
- Thoracic spine
- Lumbar spine
- Cervical spine
- Sacral spine (correct)
Where do the axons carrying sharp, well-localized pain and temperature sensations synapse?
Where do the axons carrying sharp, well-localized pain and temperature sensations synapse?
- Gracile Nucleus
- Cuneate Nucleus
- Ventral Posterior Lateral nucleus of thalamus (correct)
- Dorsal Root Ganglion (DRG)
Which tract crosses in the Dorsal Medulla/tegmentum of the caudal medulla?
Which tract crosses in the Dorsal Medulla/tegmentum of the caudal medulla?
Which tract primarily stimulates flexors and inhibits extensors?
Which tract primarily stimulates flexors and inhibits extensors?
Which tract facilitates axial and limb extensors and inhibits flexors?
Which tract facilitates axial and limb extensors and inhibits flexors?
Which tract descends uncrossed and affects antigravity muscles?
Which tract descends uncrossed and affects antigravity muscles?
Which tract maintains head position in response to vestibular nuclei?
Which tract maintains head position in response to vestibular nuclei?
Which tract is associated with reflexive head movements in response to visual or auditory stimuli?
Which tract is associated with reflexive head movements in response to visual or auditory stimuli?
Which tract facilitates flexor motor neurons and inhibits extensor motor neurons?
Which tract facilitates flexor motor neurons and inhibits extensor motor neurons?
Where do upper motor neuron fibers stimulate the interneurons that inhibit motor neurons?
Where do upper motor neuron fibers stimulate the interneurons that inhibit motor neurons?
Where does 85 to 90% of the corticospinal tract cross at?
Where does 85 to 90% of the corticospinal tract cross at?
Which tract descends in the same way as the corticospinal tract and synapses on different nuclei for voluntary movement of muscles in the head/neck?
Which tract descends in the same way as the corticospinal tract and synapses on different nuclei for voluntary movement of muscles in the head/neck?
Which tract starts from stimulation from the cortex and cerebellum to the red nucleus and descends down the cord to end in the upper cervical cord?
Which tract starts from stimulation from the cortex and cerebellum to the red nucleus and descends down the cord to end in the upper cervical cord?
Which tract will be associated with the Medial Longitudinal Fasciculus and reflexes?
Which tract will be associated with the Medial Longitudinal Fasciculus and reflexes?
Where do the fibers of the lateral vestibulospinal tract terminate?
Where do the fibers of the lateral vestibulospinal tract terminate?
Which spinal cord tract carries fast, precise pain signals via Alpha delta fibers?
Which spinal cord tract carries fast, precise pain signals via Alpha delta fibers?
Which tract is responsible for carrying achy pain signals?
Which tract is responsible for carrying achy pain signals?
Which tract contributes to pain modulation and reflexes for visual, auditory, and cutaneous stimuli?
Which tract contributes to pain modulation and reflexes for visual, auditory, and cutaneous stimuli?
Which tract arouses the cortex to maintain consciousness and alertness in response to dull or achy pain?
Which tract arouses the cortex to maintain consciousness and alertness in response to dull or achy pain?
Which tract carries unconscious proprioception and does not cross?
Which tract carries unconscious proprioception and does not cross?
Which tract carries unconscious proprioception and crosses twice, ending in the cerebellum?
Which tract carries unconscious proprioception and crosses twice, ending in the cerebellum?
Which tract carries unconscious proprioception from the upper extremity and does not cross?
Which tract carries unconscious proprioception from the upper extremity and does not cross?
Which tract carries unconscious proprioception to the cerebellum and crosses in the ventral white commissure?
Which tract carries unconscious proprioception to the cerebellum and crosses in the ventral white commissure?
Which tract carries information from the inferior olivary nucleus to the cerebellum?
Which tract carries information from the inferior olivary nucleus to the cerebellum?
Which tract is responsible for voluntary skeletal movement and crosses at the pyramidal decussation?
Which tract is responsible for voluntary skeletal movement and crosses at the pyramidal decussation?
What happens if lesions occur above the pyramidal decussation?
What happens if lesions occur above the pyramidal decussation?
What happens if lesions occur below the pyramidal decussation?
What happens if lesions occur below the pyramidal decussation?
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Study Notes
Overview of Spinal Cord Tracts
- Neospinalthalamic tract synapses in Lamina 1 or Lamina 5 and ascends to the Thalamus, via Lissauer’s Tract.
- The tract is somatotopically arranged, carrying fast, precise pain signals via Alpha delta fibers.
- The Paleospinalthalamic Tract, part of the ALS, is slower and carries achy pain signals.
- The Spinomesencephalic Tract contributes to pain modulation and reflexes for visual, auditory, and cutaneous stimuli.
- The Spinal Reticular Tract arouses the cortex to maintain consciousness and alertness in response to dull or achy pain.
- The Dorsalspinocerebellar Tract carries unconscious proprioception and does not cross.
- The Ventralspinocerebellar Tract carries unconscious proprioception and crosses twice, ending in the cerebellum.
- The Cuneorspinocerebellar Tract carries unconscious proprioception from the upper extremity and does not cross.
- The Spino-olivary Tract carries unconscious proprioception to the cerebellum and crosses in the ventral white commissure.
- The Olivocerebellar Tract carries information from the inferior olivary nucleus to the cerebellum.
- The Corticospinal Tract is responsible for voluntary skeletal movement and crosses at the pyramidal decussation.
- Lesions above the decussation result in contralateral loss, while lesions below cause ipsilateral loss, with associated upper motor neuron signs.
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