ANAT20006 Lecture Notes - Lecture 4: Autonomic Nervous System, Postganglionic Nerve Fibers, Preganglionic Nerve Fibers

• School: University of Melbourne
• Department: Anatomy and Neuroscience
• Course: ANAT20006
• Professor: Junhua Xiao

Document Summary

* the spinal nerves that run off come from 31 spinal segments (so there are 31 pairs of spinal nerves) * the cervical cord 8 segments involving the arms (muscles in arm and sensory) * the thoracic cord involves organs of the body. * the lumbar sacral cord involves limb muscle legs. * at the spinal levels supplying nerves to the limbs, the segmental spinal nerves come together to form complex nerve plexuses (the brachialand lumbosacral plexus) which redistribute axons from different segmental levels into different peripheral nerve branches. * peripheral nerve axons can be either efferent (carrying signals from the cns) or afferent (carrying signals to the cns) * although mixed in the peripheral nerves, they have separate pathways, spinals roots, connecting to the cns. * dorsal spinal roots has sensory function and ventral nerve roots has a motor function.