| PAG | periaqueductal gray [matter]; polyacrylamide gel; pregnancy-associated globulin; proliferation-assoc... |
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| SCID | severe combined immunodeficiency [syndrome]; soft copy image display; Structured Clinical Interview ... |
| SSD | shaded surface display; single saturating dose; Social Security disability; source-skin distance; so... |
| VDT | vibration disappearance threshold; visual display terminal; visual distortion test |
| VDU | video display unit |
| gray wing | A prominence in the floor of the inferior fovea of the fourth ventricle that overlies the dorsal motor nucleus of the vagus. Synonym: trigonum nervi vagi, ala cinerea, ashen wing, gray wing, trigone of vagus nerve, va'gi eminentia. (05 Mar 2000) |
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| middle gray layer of superior colliculus | See: gray layer of superior colliculus. Molecular layer, term applied to any layer of brain tissue that contains few nerve-cell bodies and is composed largely of terminal arborizations of dendrites and axons; notable examples are the superficial layer (first layer) of the cerebral cortex and the molecular layer of cerebellum. Synonym: plexiform layer, stratum moleculare. (05 Mar 2000) |
| pontine gray matter | The massive gray matter filling the basilar pons. The nuclei are of fairly homogeneous architecture and project to the cortex of the contralateral cerebellar hemisphere by way of the middle cerebellar peduncle. Their main afferents come from the entire extent of the cerebral neocortex by way of the longitudinal pontine bundles (corticopontine fibres); thus, the pontine nuclei form a major way-station in the impulse conduction from the cerebral cortex of one hemisphere to the posterior lobe of the opposite cerebellum. Synonym: nuclei pontis, pontine gray matter. (05 Mar 2000) |
| heterotopic gray matter | <radiology> Presence of cortical neurons in an abnormal location secondary to arrest of migrating neuroblasts from ventricular walls to brain surface between 7-24 weeks of gestational age, frequency: 3% of healthy population associated with: agenesis of corpus callosum, aqueductal stenosis, microcephaly, schisencephaly, encephalocele X-ray: single/multiple bilateral subependymal nodules along lateral ventricles Differential diagnosis: subependymal spread of neoplasm, subependymal haemorrhage, vascular malformation, tuberous sclerosis, intraventricular meningioma, neurofibromatosis (12 Dec 1998) |
| superficial gray layer of superior colliculus | See: gray layer of superior colliculus. (05 Mar 2000) |
| deep gray layer of superior colliculus | A layer of myelinated fibres, the deepest layer of the colliculus superior, delimiting the latter from the central gray substance surrounding the cerebral aqueduct. Synonym: stratum album profundum. (05 Mar 2000) |
| abbreviated injury scale | Classification system for assessing impact injury severity developed and published by the american association for automotive medicine. It is the system of choice for coding single injuries and is the foundation for methods assessing multiple injuries or for assessing cumulative effects of more than one injury. These include maximum ais (mais), injury severity score (iss), and probability of death score (pods). (12 Dec 1998) |
| absolute scale | An obsolete term for Kelvin scale. (05 Mar 2000) |
| activities of daily living scale | A scale to score physical activity and its limitations, based on answers to simple questions about mobility, self-care, grooming, etc; widely used in geriatrics, rheumatology, etc. (05 Mar 2000) |
| Angstrom scale | A table of wavelengths of a large number of light rays corresponding to as many Fraunhofer's lines in the spectrum. (05 Mar 2000) |
| Baume scale | A hydrometer scale for determining the specific gravity of liquids heavier and lighter than water, respectively: for liquids lighter than water, divide 140 by 130 plus the Baume degree; for liquids heavier than water, divide 145 by 145 minus the Baume degree. (05 Mar 2000) |
| Binet scale | A measure of intelligence designed for both children and adults. (05 Mar 2000) |
| Binet-Simon scale | Forerunner of individual intelligence tests, particularly the Stanford-Binet intelligence scale, and sometimes referred to as the Binet scale. (05 Mar 2000) |
| Brazelton's Neonatal Behavioural Assessment Scale | A scale used by obstetricians, paediatricians, and paediatric psychologists to assess the sensory, motor, emotional and physical development of the neonate, usually beginning at birth or in the first month of life. (05 Mar 2000) |
| brief psychiatric rating scale | A scale comprising 18 symptom constructs chosen to represent relatively independent dimensions of manifest psychopathology. The initial intended use was to provide more efficient assessment of treatment response in clinical psychopharmacology research; however, the scale was readily adapted to other uses. (12 Dec 1998) |