BIOL 4370 Lecture Notes - Dorsal Root Ganglion, Lamellar Corpuscle, Posterior Grey Column
16 Mar 2014
School
Department
Course
Professor
Document Summary
Sept 26th: dermatomes: certain areas are related to certain areas of the spinal chord. Section are cervical, thoracic, lumbar, or sacral: skin: we have specialized receptors in skin. Underneath fingerprint we have free nerve endings (end of axons) are responsible for thermoreceptive and noiciceptive touch (mechanoreceptors) have 4 different axon endings. Adaptation is reduction of aps firing over time during constant stimulus: slow. Merkel cellneurite complex: detect texture or spactial tactile acuity. Adaptation: rapidly some axons for pain, temp, or itch are thin and unmyelinated (c ) take 1s to travel 1m. Some axons for pain and temp are less thing and a little myelinated (a delta) take. Some axons for touch are thick (a beta) take 20ms to travel 1m dorsal root ganglion cells contain cell bodies outside of cns. Ap (primary order neuron) of a delta and c enters spinal cord at dorsal root and synapse in gray matter of dorsal horn.
