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sensory impulse

Electrical signal propagated along the nerve fibers (axons) enabling the nerve cells to communicate and to transmit messages within the organism.

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motor end plate

Contact zone between the axonal end of the motor neuron and the muscle fiber that causes muscle movement.

white matter

Section of the spinal cord made up of nerve fibers (axons) and surrounding the gray matter.

gray matter

Central part of the spinal cord primarily made of the cell bodies of neurons.

muscle fiber

Component tissue of the muscle; it contracts in response to a nerve impulse from the central nervous system.

sensory neuron

Neuron transmitting information gathered by sensory receptors to the central nervous system.

chain of neurons

sense receptor

Peripheral terminal of the sensory neuron receiving a stimulus (touch, noise or other) and transmitting it to the spinal cord in the form of nerve impulses.

skin

The body’s outer protective casing whose internal layer (dermis) is rich in veins and nerves.

skin

spinal cord

Part of the central nervous system located in the vertebral column; it receives and transmits nerve information and releases the reflexes.

cervical vertebra

synapse

Contact zone between two neurons through which nerve impulses are transmitted.

chain of neurons

motor root

Bundle of motor nerve fibers (axons) communicating information from the spinal cord to the periphery of the body, especially the muscles.

motor neuron

Neuron conducting nerve impulses from the central nervous system to the peripheral organs, such as the muscles.

chain of neurons

spinal nerve

Nerve formed by the union of the sensory and motor roots; it communicates nerve messages between the spinal cord and the various parts of the organism.

protoneuron

First neuron of the sensory tract; it transmits information from a sensory organ to the spinal cord.

spinal ganglion

Bulge of the posterior sensory root of the spinal nerve; it encloses the cell bodies of the neuron sensors.

sensory root

Bundle of sensory nerve fibers (axons) communicating information from the periphery of the body to the spinal cord.