NBB 301 Chapter Notes - Chapter 1: Stretch Reflex, Camillo Golgi, Dorsal Root Ganglion

• School: Emory University
• Department: Neuroscience & Behavioral Sci
• Course: NBB 301
• Professor: Frenzel Kristen

Document Summary

Chemical synapse (most abundant; neurotransmitters; synaptic vesicles) > electrical synapse (facilitated by gap jxns; rare; special fxns) Cns; maintain chem enviro for neuronal signaling; retain traits of stem cells. Both retain stem cell properties --> more oligodend and schwann cells from hematopietic precursor cells; remove cellular debris; secrete signaling molec; Afferent neurons: info from periphery to brain/spinal cord: myotatic reflex: knee-jerk reflex. Sensory neurons that control reflex: dorsal root ganglia(peripheral) v cranial nerve ganglia(head/neck) Efferent neurons: info away from brain/spinal cord: motor neurons: efferent. Interneurons: receive contact from sensory afferent --> synapses on efferent motor: complementary activation and inactivation of synergistic and antagonistic muscles that control body, electrophysiological recording: measures electrical activity of nerve cell. Extracellular recording: electrode placed near nerve cell of interest. Intracellular recording: electrode placed inside nerve cell of interest. Tracts: bundles of axons: commissures: tracts that cross midline of brain.