ANAT 321 Lecture Notes - Lecture 4: Dorsal Root Ganglion, Postcentral Gyrus, Medial Lemniscus

• School: McGill University
• Department: Anatomy and Cell Biology
• Course: ANAT 321
• Professor: David Ragsdale

Document Summary

Ganglion: collection of cell bodies in the pns. Nucleus: collection of cell bodies in the cns. Sensory information destined to the cortex passes through the thalamus. Processing is done in hierarchal levels (from basic to complex) Initial cortical processing occurs in primary sensory areas unimodal association multimodal association. Perceptions are constructed by the brain and represent the real word but do not replicate it. This is the pathway for somatosensory processing. Information crosses the midline in the brainstem (pons/medulla): axons of primary afferents stay on the same side, synapses are mostly glutamatergic, somatosensory input is less branched than pain because it is a neutral source of. Note: there are branches into gray matter which provide information for reflexes (ex: stretch information reflex) This is the pathway for pain processing. Important in arousal and knowing where the pain is from. Information crosses the midline in the spinal cord: synapses are mostly glutamatergic, pain and temperature are experiences which affect us.