ANAT 321 Lecture Notes - Lecture 3: Dorsal Root Ganglion, Posterior Grey Column, Posterior Column

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

Document Summary

Synapses on dendrites, epsps integrated on dendrites/soma, action potentials down axon. Long axon starts in skin surface, through periphery into dorsal (back) spinal cord. Cell body in stalk (dorsal root ganglia) just outside spinal cord. Action potentials pass through right by cell body into spinal cord. Dorsal root: spinal nerve that enters dorsal horn. 2 separate pathways of somatic sensory information to brain. Separate labelled lines organized into separate parallel pathways. Fine touch/proprioception enters dorsal horn (grey) of spinal cord go into spinal cord white matter. Don"t make synapses in spinal cord; head upward toward brain. Info stays on same side of spinal cord. Excitatory synapse in brainstem; to neurons in dorsal column nuclei axons cross to other side of brain to thalamus (vpl nucleus) Somatic sensory touch info from body on opposite side of brain. Sensory axons also enter dorsal horn of spinal cord synapse in spinal cord grey matter onto.