Anatomy and Cell Biology 3319 Lecture Notes - Lecture 9: Dorsal Root Ganglion, Medial Lemniscus, Posterior Grey Column
24 Oct 2018
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Three main ascending pathways: dorsal column/medial lemniscus sensory system, spinothalamic and spinoreticular pathways, spinocerebellar pathways. Sensory system discriminative touch, pressure, vibratory sensation, and conscious joint position unconscious joint position=proprioception. Sensory info in the mixed spinal nerve (contains both motor and sensory sensation) If we leave the lumbar spinal to the cervical, the same thing happens: we have dorsal root ganglia, this info from upper body at cervical body is turning and ascending to go towards. Info comes into the dorsal horn the brain: when we look at cerebral cortex we said it has topographical organization (map/homunculus, the body is mapped in spinal cord too. Lower body is represented more medial than parts of the upper body, so there is a medial to lateral representation in the dorsal funinculus. Info from lower body is ascending in the gracile funinculus. Info from upper body ascending in cuneate funinculus: at this stage, obviously, info has not crossed the midline (still ipsilateral)
