Author: Glossary
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Opisthoglyphous
Rear-fanged or grooved; said of certain mildly venomous snakes with fangs in the upper posterior portion of their oral cavity.
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Opisthion
The craniometric point at the middle of the lower border of the foramen magnum.
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Endogenous opioid peptide
Any of a group of more than 15 substances present in the brain, certain endocrine glands, and the gastrointestinal tract. They have morphine-like analgesic properties, behavioral effects, and neurotransmitter and neuromodulator functions. Included in this group of chemicals are endorphins, enkephalins, and dynorphin.
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Opiate receptor
A specific site on a cell surface that interacts in a highly selective fashion with opiate drugs. These receptors mediate the major known pharmacological actions and side effects of opiates and the functions of the endogenous opiate-like substances — endorphins and enkephalins,
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Metric ophthalmoscopy
The use of ophthalmoscopy to determine the refractive error of the lens of the eye.
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Medical ophthalmoscopy
The use of ophthalmoscopy to diagnose systemic disease.
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Indirect ophthalmoscopy
Observation of an inverted image in the ocular fundus.
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Direct ophthalmoscopy
Observation of an upright image in the ocular fundus.
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Ophthalmoplegia totalis
Paralysis that affects both internal and external ocular muscles.
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Ophthalmoplegia progressiva
Ocular muscle paralysis in which all the muscles become involved slowly due to deterioration of the motor nerve nuclei.