NRSC 2100 1st Edition Lecture 13 Mammalian Nervous System Anatomy The structure of the nervous system tells us about brain function Brain organization Mammalian plan Main Nervous System divisions CNS central and PNS peripheral Some jargon for neural projections of groups of neurons Track group of axons traveling together in the central nervous system CNS Nerve group of axons traveling together in the peripheral nervous system PNS Cerebral Spinal Fluid produced by the choroid plexus it cushions the brain and spinal cord against impact The Central Nervous System Cerebrum cerebellum brain stem Brain Spinal Cord Peripheral Nervous System Somatic Spinal nerves innervating the skin joints and muscles controlling voluntary movements Autonomic Spinal nerves innervating internal organs blood vessels and glands unconsciously Sensory Carries sensory signals from skin skeletal muscles proprioception joints bones and other sensory systems to central nervous system afferents to CNS Motor Carries motor information from the central nervous to skeletal muscles efferents from CNS These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Cranial Nerves are also part of the somatic nervous system carries info from special senses taste smell vision hearing and equilibrium in addition to somatosensory and motor info axons enter and exit brain via cranial nerves Autonomic Nervous System All preganglionic neurons Symp Parasymp use acetylcholine as neurotransmitter Symp postganglionic neurons use noradrenaline Parasymp postganglionic neurons also use acetylcholine
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