Orientation, anatomic terms of
See Anatomic terms of orientation.
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- Orifice
An opening. For example, the mouth is an orifice.
- Ornithine
An amino acid that is not found in protein but is important in the formation of urea and the disposal of excess nitrogen. Ornithine is produced when urea is split off from arginine and ornithine is itself converted into citrulline.
- Ornithine transcarbamylase (OTC) deficiency
A rare metabolic disorder, OTC is one of the urea-cycle disorders. The urea cycle is a series of five liver enzymes that help rid the body of ammonia, a toxic breakdown product of protein. When one of these enzymes is missing or deficient, ammonia accumulates in the blood and travels to the brain, causing coma, […]
- Ornithophobia
An abnormal and persistent fear of birds. Sufferers from ornithophobia experience undue anxiety about encountering and even being attacked by birds although they may realize their fears are quite irrational. Ornithophobia was epitomized in a 1963 film scripted by the novelist Daphne Du Maurier and the detective story writer Evan Hunter and directed by the […]
- Oromandibular dystonia
Botox) have been used as a treatment.