PSY 434 Chapter Notes - Chapter 5: Dorsal Root Ganglion, Medial Lemniscus, Dorsal Root Of Spinal Nerve

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Somatosensory feedback - information that is obtained through the sensory system that monitors the bodies system and movements (joints, muscles, skin etc. ) 3 types of somatic information: nociception - pain and temperature, hapsis - fine touch and pressure, propropception - awareness of the body and position in space. Spinal cord is split into two the dorsal and the ventral root ganglia: dorsal root ganglia - sensorimotor, ventral root ganglia - motor, 30 pairs of spinal nerves which consist of one ventral and one dorsal ganglia. Cervical - 1-8, thoracic - 1-12, lumbar 1-5, sacral 1-5: dermatomes - different areas of the skin that are affected differently by each of the 30 dorsal roots of the spinal cord. Dorsal spinothalamic tract - transmitting information about proprioception and hapsis: enter through the spinal cord through the dorsal root and synapses ipsilaterally through the column.

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