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Action potential
Momentary change in electrical potential on the surface of a cell, especially of a nerve or muscle cell, that results in the transmission of an electrical impulse
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Arachnoid mater
Middle layer of meninges that has spider web appearance and covers larger blood vessels
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Autonomic nervous system
Group of motor neurons that connect CNS to smooth muscles, cardiac muscles, and endocrine glands and is associated with involuntary control of body functions
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Axon
Cytoplasmic extension of neuron that acts to transmit impulse away from the cell
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Axon hillock
Area where axon where it emerges from the soma and is the area where nerve impulse is initiated
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Axon terminal
Terminal end of axon containing a presynaptic membrane that releases a neurotransmitter to elicit a response on another neuron or other tissue
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Blood brain barrier
Biological structure that restricts the passage of various substances and microscopic objects between the bloodstream and the CNS, while still allowing the passage of substances essential to metabolic function
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Brain
Organ of CNS that serves as the primary center for the regulation and control of bodily activities
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Central nervous system
Section of vertebrate nervous system that includes the brain and spinal cord which is involved in receiving sensory information, integrating or interpreting information and generating response
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Cerebrospinal fluid
Fluid that surrounds brain and spinal cord
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CNS
Section of vertebrate nervous system that includes the brain and spinal cord which is involved in receiving sensory information, integrating or interpreting information and generating response
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CSF
Fluid that surrounds brain and spinal cord
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Dendrite
Cytoplasmic extensions of neuron that act as receptors to external stimuli or other neurons
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Dura mater
Tough inflexible outer layer of meninges that restricts movement
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Exteroceptors
Sensory neurons that respond to external stimuli or stimuli outside the body
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Gap junction Protein structures found between neurons at the synapse that allow communication
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Interoceptors
Sensory neurons that monitor visceral organ and their function
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Meninges
Group of membranes that surround CNS & serves to protect it from the environment
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Motor neuron
Neurons that carry impulses from brain to skeletal, smooth, and cardiac muscles and endocrine glands in the body to elicit a response
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Myelin sheath
Phospholipids layer located on axon that increase the speed of impulse in providing insulation to electrical current
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Nervous system
System that functions by allowing animal to interact with internal and external environments
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Neuron
Specialized, electrically excitable cell that processes and transmits information by electrical and chemical signaling
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Nodes of Ranvier
Area between myelin sheath in which the axon has no protection
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Parasympathetic neuron
Group of autonomic neurons that are involved in energy conservation and digestive tract control and tends to inhibit stress responses
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Peripheral nervous system
All nervous tissue except the brain and spinal cord and includes sensory neurons responsible for collecting sensory information and motor neurons responsible for eliciting responses from brain
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Pia mater
- Inter layer of meninges that is very thin fibrous covering that is essentially
- attached to brain/spinal cord
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PNS
All nervous tissue except the brain and spinal cord and includes sensory neurons responsible for collecting sensory information and motor neurons responsible for eliciting responses from brain
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Proprioceptors
Sensory neurons that monitor muscles and joints
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Sensosry neuron
Neurons that collect information from internal and external environment and sends this information to CNS for processing
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Soma
Cell body of neuron that nucleus, ribsomes, smooth and rough endoplasmic reticulum, mitochondria and golgi apparatus
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Somatic nervous system
Group of motor neurons that is associated with voluntary control of body movements via skeletal muscles
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Spinal cord
Nervous tissue that extends from brain through vertebral canal
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Sympathetic neuron
Group of autonomic neurons that are involved in fight or flight or emergency situations and mediates increases in alertness, heart rate, blood pressure, sweating & energy mobilization
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Synapse
Junction between two neurons that the impulse crosses either a chemical reactions or an electrical channel
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