| ACTA | American Cardiology Technologists Association; automatic computerized transverse axial [scanning] |
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| radiatio optica | The massive, fanlike fibre system passing from the lateral geniculate body of the thalamus to the visual cortex (striate or calcarine cortex, area 17 of Brodmann); the fibres follow the retrolenticular and sublenticular limbs of the internal capsule into the corona radiata but they curve back along the lateral wall of the temporal and occipital horns of the lateral ventricle to the striate cortex on the medial surface and pole of the occipital lobe. Synonym: radiatio optica, geniculocalcarine radiation, geniculocalcarine tract, Gratiolet's fibres, Gratiolet's radiation, occipitothalamic radiation, Wernicke's radiation. (05 Mar 2000) |
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| pars optica retinae | The internal layer of the retina containing the neural elements, as distinguished from the outer leaf of the retina, or pigmented layer. Synonym: pars optica retinae, neural layer of retina, optic part of retina, stratum cerebrale retinae. (05 Mar 2000) |
| hyperesthesia optica | Extreme sensitiveness of the eyes to light. See: photophobia, photosensitivity. (05 Mar 2000) |
| neuromyelitis optica | A demyelinating disease of the optic nerve chiasma, optic tract, and spinal cord characterised by acute bilateral optic neuritis and acute myelitis. (12 Dec 1998) |
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