Category: E
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Extrinsic muscle
A muscle which is some way away from the part of the body which it operates. A muscle, such as any of those controlling movements of the eyeball, that has its origin some distance from the part it acts on. The muscles outside an organ that control its position, such as the e.m. of the…
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Extrinsic ligament
A ligament between the bones in a joint which is separate from the joint capsule.
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Extrinsic allergic alveolitis
A condition in which the lungs are allergic to fungus and other allergens.
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Extremities
The parts of the body at the ends of limbs, e.g. the fingers, toes, nose and ears.
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Extrasensory
Involving perception by means other than the usual five senses. To forms of perception, such as thought transference, that are not dependent on the five primary senses.
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Extrapleural
Outside the pleural cavity. Relating to the tissues of the chest wall outside the parietal pleura.
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Extraembryonic membranes
Membranes which are not part of the embryo. The membranous structures that surround the embryo and contribute to the placenta and umbilical cord. They include the amnion, chorion, allantois, and yolk sac. In man the allantois is always very small and by the end of pregnancy the amnion and chorion have fused into a single…
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Extradural haemorrhage
A serious condition where bleeding occurs between the dura mater and the skull. Blood is leaking into the area that is between the inside of the skull and the outer surface of the dura mater, which is the exterior layer of the meninges, the protective cover of the brain. An extradural hemorrhage, which typically happens…
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Extradural haematoma
A blood clot which forms in the head outside the dura mater, caused by a blow.
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Extracapsular fracture
A fracture of the upper part of the femur, which does not involve the capsule round the hip joint.