Herewith some comments belonging to the medial motor systems and the somatosensory

25 important questions on Herewith some comments belonging to the medial motor systems and the somatosensory

Where does the rubrospinal tract originate?

  • Originates in the midbrain
  • Associated with the red nucleus

At which levels are the vestibulospinal and reticulospinal tracts located?

  • Origin in the pons and medulla
  • Located at a lower level

What happens to the rubrospinal tract and vestibulospinal tracts in case of lesions above their level?

  • They remain intact
  • Not affected by the lesions
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How does the posterior column ascend in the spinal cord?

  • Located at the back side
  • Contains gracile and cuneate fascicles

Where does the posterior column terminate?

  • Ends in the somatosensory cortex
  • Located in the parietal lobe

Where does the spinothalamic tract project?

  • Projects to the thalamus
  • Connects to the parietal lobe or prefrontal cortex

What does the neospinothalamic tract localize?

  • Localization and nature of pain
  • Types include pricking and dull

What is the paleospinothalamic tract associated with?

  • Involved in suffering from pain
  • Seeks medical help

What belongs to the extrapyramidal system and is crucial for muscle tone, posture, and balance?

Medial motor systems play a crucial role in:
  • Muscles tone
  • Posture
  • Balance

Where does the origin of the rubrospinal tract lie?

The origin is in the midbrain.

What happens in case of an infarction of the middle cerebral artery (MCA)?

It damages cortex and subcortical areas, but not certain nuclei.

What explains the typical hemiparesis/hemiplegia observed?

Damaged cortical pathways to medial motor systems cause spasticity.

What role does the rubrospinal tract play in body movement?

It plays a role in flexion of the arm.

What are the two ascending sensory systems mentioned?

The posterior column and anterolateral pathway.

What happens to the posterior column at the caudal medulla?

It crosses over via arcuate fibres.

What is the final target of the posterior column?

The somatosensory cortex in the parietal lobe.

What are the three parts of the anterolateral pathway?

They are:
  1. Spinoreticular tract
  2. Spinomesencephalic tract
  3. Spinothalamic tract

Where does the spinoreticular tract project?

It projects to the locus coeruleus at the pons.

Which tract is crucial for the localization and nature of pain?

The neospinothalamic tract serves that function.

How are the neospinothalamic and paleospinothalamic tracts categorized?

They are categorized into:
  1. Lateral pain system
  2. Medial pain system

Where do A-delta, C, and A-beta fibres meet?

In Lamina V of the dorsal horn.
  • Location of projection cells
  • Afferent nerve fibres

Which type of fibre has the highest transmission speed?

The A-beta fibres have the highest transmission speed.
  • Thin myelinated
  • Thick myelinated

What might happen when rubbing over a painful area?

It could stimulate A-beta fibres, inhibiting pain stimuli.
  • Gate control theory
  • Incoming pain stimuli

Where do most A-beta fibres ascend?

They ascend directly in the posterior column.
  • Largest part of A-beta
  • Sensory pathways

At which lamina levels do some A-beta fibres enter the dorsal horn?

At the levels of Lamina II, III, and IV.
  • Join A-delta and C fibres
  • Dorsal horn layers

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