Proprioception predicts Motor

Proprioception predicts Motor

1. Neuropathways of proprioception

   • https://clinicalgate.com/sensory-and-motor-pathways/
   • dorsal column pathway
     • Axons emerge from the dorsal column nuclei and arch anteriorly and medially through the substance of the medulla as the internal arcuate fibres (Latin: arcuate, shaped like a bow). These axons cross the midline as the great sensory decussation. It is important to appreciate that in the dorsal column pathway all the second-order axons cross the midline together (in the great sensory decussation of the medulla). Having crossed the midline, the second-order fibres turn sharply upwards and ascend to the thalamus as the medial lemniscus. This is a strap-like bundle which twists like a ribbon as it passes through the brain stem (Latin: lemniscus, ribbon). The medial lemniscus terminates on third-order neurons in the thalamus, which project to the primary somatosensory cortex in the parietal lobe.
     • The first-order neurons have their cell bodies in the dorsal root ganglia and central processes that enter the spinal cord via the dorsal (sensory) root. Second-order neurons have their cell bodies in the CNS grey matter (brain stem or spinal cord) and give rise to axons that cross the midline, before ascending to the thalamus. The third-order (thalamocortical) neurons project from the ventral posterior (VP) nucleus of the thalamus to the primary somatosensory cortex in the parietal lobe.

2. proprioception

   • Tests for Prop
     • vibration - 128 Hz tuning fork to bony prominences; eyes closed, when starts and stops
     • joint position: Romberg's test- stand with eyes closed
     • Position sense: eyes closed, passive flex/ext wrist

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