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15 terms

Functional Classification of Neurons

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Sensory neurons
carry impulses to the center; detect changes inside and outside the body; begin in any organ and end in CNS
Interneurons
lie in CNS; process, store, and recieve informationl receive impulses from sensory receptors and madke decisions in repsonse
Motor neurons
carry messages away from CNS; employ peripheral neurons to carry message form brain to the effector
Sensory, inter, motor
Functional classification of neurons
Central, Peripheral, Somatic, Autonomic
Divisions of the Nervous system
Central Nervous System
spinal cord, brain
Peripheral Nervous System
cranial nerves arise from the brain; spinal nerves arise from the spinal cord
Somatic Nervous System
connects to skin and skeletal muscles' conscious activities (voluntary)
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
Central Canal
contains cerebrospinal fluid
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
Gray Matter
majority of this area is interneurons and some motor neurons (lacks myelin)
White Matter
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
Ventral Root
contains axons of motor neurons whose cell bodies are in the gray matter