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Dilation and constriction of the pupil. Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve.. A constriction response (), [1] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti-hypertension medications.
A mydriatic pupil will remain excessively large even in a bright environment. The excitation of the radial fibres of the iris which increases the pupillary aperture is referred to as a mydriasis. More generally, mydriasis also refers to the natural dilation of pupils, for instance in low light conditions or under sympathetic stimulation.
Nerves involved in the resizing of the pupil connect to the pretectal nucleus of the high midbrain, bypassing the lateral geniculate nucleus and the primary visual cortex. From the pretectal nucleus neurons send axons to neurons of the Edinger-Westphal nucleus whose visceromotor axons run along both the left and right oculomotor nerves .
From fascinating bite-size tidbits about science, to celebrities, history, and the plain weird and bizarre. The “Today I Learned” (TIL) page is a go-to corner of the internet, where a whopping ...
Opiate overdose symptoms and signs can be referred to as the "opioid toxidrome triad": decreased level of consciousness, pinpoint pupils and respiratory depression. Other symptoms include seizures and muscle spasms. Sometimes an opiate overdose can lead to such a decreased level of consciousness such that the person will not wake up.
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Content warning: The following article contains disturbing descriptions of abuse. A Texas foster mother is facing serious criminal charges after the teenaged girl in her care died weighing just 78 ...
A science book is a work of nonfiction, usually written by a scientist, researcher, or professor like Stephen Hawking (A Brief History of Time), or sometimes by a non-scientist such as Bill Bryson (A Short History of Nearly Everything).