| cx | cervix; complex; cylinder axis |
|---|---|
| EA | early antigen; educational age; egg albumin; electric affinity; electrical activity; electroacupunct... |
| ECA | electrical control activity; electrocardioanalyzer; endothelial cytotoxic activity; enterobacterial ... |
| EIT | electrical impedance tomography; erythroid iron turnover |
| EMS | early morning specimen; early morning stiffness; electrical muscle stimulation; Electronic Medical S... |
| secondary axis | Any ray passing through the optical centre of a lens. (05 Mar 2000) |
|---|---|
| pupillary axis | A line perpendicular to the surface of the cornea, passing through the centre of the pupil; the "direction of gaze." (05 Mar 2000) |
| neural axis | The central nervous system; the brain and spinal cord. Synonym: encephalomyelonic axis, neural axis. (05 Mar 2000) |
| neutral axis of straight beam | The axis perpendicular to the plane of loading of a beam at stresses within the proportional limit; it lies at the gravity axis of the cross-section of the beam. (05 Mar 2000) |
| symmetry axis | <radiobiology> The straight line (usually vertical) through the centre of a configuration, when the configuration is symmetric to all (axisymmetric, like the tokamak) or some (periodic, like the stellarator) rotations about this line. Usually the z-axis. (09 Oct 1997) |
| internal axis of eye | <anatomy> That part of the optic axis from the midpoint of the posterior surface of the cornea to the anterior surface of the retina opposite the posterior pole. Synonym: axis bulbi internus. (05 Mar 2000) |
| opening axis | An imaginary line around which the mandibular condyles may rotate during opening and closing movements. Compare: fulcrum line. (05 Mar 2000) |
| optical axis | <physics> The line passing through both the centres of curvature of the optical surfaces of a lens, the optical centreline for all the centres of a lens system. (09 Oct 1997) |
| optic axis | The axis of the eye connecting the anterior and posterior poles; it usually diverges from the visual axis by five degrees or more. Synonym: axis opticus. (05 Mar 2000) |
| orbital axis | The line from the centre of the optic foramen (apex of orbit) extending anteriorly, laterally, and inferiorly to the middle of the orbital opening. (05 Mar 2000) |
| thoracic axis | <anatomy, artery> Origin, axillary; distribution, muscles and skin of shoulder and upper chest; anastomoses, branches of superior thoracic, internal thoracic, lateral thoracic, posterior and anterior circumflex humeral, and suprascapular. Synonym: arteria thoracoacromialis, acromiothoracic artery, thoracic axis, thoracoacromial trunk. (05 Mar 2000) |
| thyroid axis | A short arterial trunk arising from the subclavian artery, giving rise to the suprascapular (which may instead arise directly from the subclavian artery) and terminating by dividing into the ascending cervical and inferior thyroid arteries. Synonym: truncus thyrocervicalis, thyroid axis. (05 Mar 2000) |
| electron optical axis | <physics> The path of an electron through an electron optical system along which it suffers no deflection due to lens fields. This axis does not necessarily coincide with the mechanical axis of the system. (05 Aug 1998) |
| embryonic axis | The cephalocaudal axis established in the embryo by the primitive streak. (05 Mar 2000) |
| encephalomyelonic axis | The central nervous system; the brain and spinal cord. Synonym: encephalomyelonic axis, neural axis. (05 Mar 2000) |