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Central Nervous System
The central nervous system (CNS) is the part of the nervous system that coordinates the activity of all parts of the bodies of bilaterian animals-that is, all multicellular animals except sponges and radially symmetric animals such as jellyfish. TERM 2
Peripheral Nervous System
DEFINITION 2 The Peripheral Nervous System (PNS) resides or extends outside the central nervous system (CNS), which consists of the brain and spinal cord. TERM 3
Neuron
DEFINITION 3 A neuron ( , also known as a neurone or nerve cell) is an electrically excitable cell that processes and transmits information by electrochemical signaling, via connections with other cells called synapses. TERM 4
Cell body
DEFINITION 4 The soma (pl. TERM 5
Fibers
DEFINITION 5 Fiber, also spelled fibre, is a class of materials that are continuous filaments or are in discrete elongated pieces, similar to lengths of thread.
Axons
An axon or nerve fiber is a long, slender projection TERM 7
Dendrites
DEFINITION 7 Dendrites (from Greek dndron, -tree-) are the branched projections of a neuron that act to conduct the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project. TERM 8
Myelin Sheath
DEFINITION 8 Myelin is a dielectric (electrically insulating) material that forms a layer, the myelin sheath, usually around only the axon of a neuron. TERM 9
Interneuron
DEFINITION 9 An interneuron (also called relay neuron, association neuron or local circuit neuron) is a multipolar neuron which connects afferent neurons and efferent neurons in neural pathways. TERM 10
Resting Potential
DEFINITION 10 Relatively static membrane potential of quiescent cells is called resting membrane potential (or resting voltage), as opposed to the specific dynamic electrochemical phenomenona called action potential and graded membrane potential.
