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carry impulses to the center; detect changes inside and outside the body; begin in any organ and end in CNS
lie in CNS; process, store, and recieve informationl receive impulses from sensory receptors and madke decisions in repsonse
carry messages away from CNS; employ peripheral neurons to carry message form brain to the effector
Peripheral Nervous System
cranial nerves arise from the brain; spinal nerves arise from the spinal cord
Autonomic Nervous System
connects CNS to viscera; acts on all effectors other than skeleton; unconscious activities sympathetic (emergency), parasymphatic
Central Canal, Dorsal Root, Dorsal Root Ganglion, Gray matter, White Matter, Ventral Root
Parts of the Spinal cord
Dorsal Root and Dorsal Root Ganglion
contains cell bodies of sensory neurons; sensory dendrites carry information to cell body and axon takes it into the spinal cord
highway; glistering white appearance due to myelin; bundles of myelinated axons form nerve tracts up and down the spinal cord; bundles arranged in 3 columns- anterior, posterior, lateral funiculi
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