Medical terms/definitions - O

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Oesophagus - the muscular tube down which food is carried extends from the pharynx (throat) to the stomach

Oestrogen - a female sex hormone, produced mainly in the ovaries, that stimulates the development of secondary sexual characteristics in women and regulates the menstrual cycle

Olfactory nerves - the nerves of smell that run from the nose directly into the underside of the brain

Optic nerves - the two nerves of vision that run from the retina of each eye and carry visual information to the brain, each is made up of about one million nerve fibres

Ossicle - one of the three tiny bones of the middle ear


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