Dorsal Column Pathways

1
Dorsal Column Pathways Medial Lemniscus

• Discriminative Touch
• Pressure
• Vibratory Sensation
• Fine Discrimination
• Two-Point Tactile Test
• Proprioception (conscious)
• Sense of movement position (eg is your toe up
  or down?) Muscle Spindles, GTOs Joint Receptors

2
Dorsal Column Pathways

• Input from the lower extremity, up to the level
  of T6 passes into the Fasciculus Gracilis of the
  dorsal funiculus.
• The first order neuron enters the cord ascends
  without either synapsing or crossing to the
  opposite side.

3
Dorsal Column Pathways

• Input from the upper extremity, down to the level
  of T5 passes into the Fasciculus Cuneatus.
• Somatotopic Organization Input from the arm
  (Fasciculus Cuneatus) is lateral to input from
  the leg (Fasiculus Gracilis)

4
Dorsal Column Pathways Medial Lemniscus

• Cerebral Cortex
• VPL Thalamus (Synapses again here)
• Nucleus Cuneatus Gracilis
• Fasciculus Cuneatus
• Fasciculus Gracilis
• Dorsal Root Ganglia

Synapses and Crosses now as the Medial
Lemniscus