Radience

Nervous System and the Eye

Science

autonomic nervous system

the part of the nervous system that controls involuntary actions
autonomic nervous system Simple Definition

axon

an extension of the neuron that carries messages away from the nerve cell body
axon Simple Definition

brain

the organ that is the control center of the nervous system
brain Simple Definition

brain stem

the structure that connects the brain to the spinal cord, it includes the pons and the medulla oblongata
brain stem Simple Definition

central nervous system

the brain and spinal cord, which form the control center of the nervous system
central nervous system Simple Definition

cerebellum

the part of the brain that coordinates movement and balance
cerebellum Simple Definition

cerebrum

the largest part of the brain, it controls the senses, learning, movement, and memory
cerebrum Simple Definition

cochlea

a fluid-filled spiral structure in the ear that converts sound vibration into nerve impulses
cochlea Simple Definition

cornea

the transparent front part of the eye, through which light enters it
cornea Simple Definition

dendrite

a threadlike extension of a neuron that receives impulses from other neurons
dendrite Simple Definition

eye lens

the structure in the eye that focuses light onto the retina
eye lens Simple Definition

iris

the colored part of the eye, it controls how much light enters the eye
iris Simple Definition

neuron

a nerve cell that carries impulses in the nervous system
neuron Simple Definition

peripheral nervous system

the nerves that carry signals between the entire body and the central nervous system
peripheral nervous system Simple Definition

pupil

the opening at the center of the iris, through which light enters the eye
pupil Simple Definition

reflex

an automatic response to stimulus without conscious control, like a blink or blush
reflex Simple Definition

retina

the light-sensitive layer at the back of the eye, it contains rods and cones
retina Simple Definition

stimulus

anything that causes an organism to react
stimulus Simple Definition

synapse

the small gap where impulses travel from one neuron's axon to another neuron's dendrite
synapse Simple Definition

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