BIOLOGY 2A03 Lecture Notes - Lecture 8: Dorsal Root Ganglion, Dorsal Root Of Spinal Nerve, Ventral Root Of Spinal Nerve
13 Mar 2018
School
Department
Course
Professor
Document Summary
Classified based on mode of stimulus they detect. In nose, all odours that are detected are done so by unique sensory receptors. Baroreceptors - detect blood pressure and regulate the heart and vasculature. Chemoreceptors - sense o2, co2, and ph of blood and regulate breathing. Stretch receptors - sense stomach distension after a meal. Can be specialized endings of afferent neurons or separate cell that synapses with an afferent neuron. Sensory unit = single afferent neuron and all associated receptors. Depending on sensory fields movement on skin can be detect more easily on certain areas of the body. Receptor potential = graded potential induced by a stimulus in sensory receptor. Information about stimulus intensity transmitted via ap frequency. Stronger stimuli = increase graded potential = increase ap frequency. Sensory pathway = afferent neuron transmits sensory information to cns. Single afferent neuron can diverge to several second-order interneurons. Second-order interneurons - receive and integrate signals from many afferent neurons (convergence)
