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- Glossary
Pupil
The opening in the eye through which light enters. The size of the pupil is determined by the iris and changes reflexively (pupillary reflex). This process of adjusting to the brightness of the environment is called adaptation.
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Glossar
15.03.2017
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- Grundlagen
- Anatomy
The Mesencephalon
Important neurotransmitters, an astonishing array of colors, and a water pipe – that's the midbrain.
20.09.2025
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- Glossary
Adaptation
Adaptation refers to the process by which the sensory organs, the perceptual system, or the entire organism adjusts to the intensity and quality of stimuli and to changes in environmental conditions. In visual adaptation, for example, the pupil and the sensitivity of the photoreceptors regulate themselves according to the prevailing light conditions.
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- Glossary
Superior colliculus
The upper pair of hills of the four hills of the midbrain (tectum) are also referred to in the plural as colliculi superiores. They form a switching center in the optical system for reflex movements of the eyes and for pupil reflexes.
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- Glossary
Brightness
Brightness is one of the dimensions of visual perception: the perception of light intensity. It influences the size of the pupil.
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- Glossary
Iris
The (German) name "rainbow membrane" refers to the pigment coloration of the iris. Its size changes depending on the brightness of the surroundings, and with it the size of the pupil.
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- Discover
- Milestones
Andreas Vesalius – Founder of modern Anatomy
Vesalius replaced belief in authority with empiricism – and taught others about the structure of the body.
01.05.2016
