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Bio 3310 Exam 3 Nervous Sys

Terms in this set (65)

sensory (afferent) division
--carries sensory signals from various receptors to CNS
--two divisions
somatic sensory: carries signals from receptors in the skin, muscles, bones, and joints
visceral sensory: carries signals from the viscera of the thoracic and abdominal cavities
motor (efferent) division
carries signals from the CNS to gland and muscle cells that carry out the body's response
two divisions
divisions of the motor (efferent) division
--somatic motor division: carries signals to skeletal muscles
--visceral motor division(autonomic nervous sys): carries signals to glands, cardiac muscle, and smooth muscle
divisions of autonomic nervous system
--sympathetic and parasympathetic
+
excitability (irritability)
responds to stimuli
conductivity
neurons respond to stimuli by producing electrical signals that are quickly conducted to other cells at distant locations
secretion
when electrical signal reaches end of nerve fiber, a chemical neurotransmitter is secreted that crosses the gap and stimulates the next cell
sensory (afferent) neurons
--specialized to detect stimuli
--conduct signals toward CNS
interneurons (association) neurons
--entirely within the CNS
--recieve signals from many neurons and carry out the integrative function
-- process, store, and retrieve information and make decisions' that determine how the body will respond to stimuli
motor (efferent) neurons
send signals out to muscles and gland cells (the effectors)
away from CNS
multipolar neuron
-one axon and multiple dendrites
-most common
-most neurons in the brain and spinal cord
bipolar neuron
--one axon and one dendrite
--olfactory cells retina, inner ear
unipolar neuron
--single process leading away from the soma
--sensory from skin and organs
anaxonic neuron
--many dendrites but no axon
--helps with vision
axonal transport
--two way passage of proteins, organelles, and other material along the axon
--two types
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