| mean electrical axis | The average magnitude and direction of all the electromotive forces developed during the cardiac event under consideration; e.g., atrial or ventricular depolarisation, or ventricular repolarization. See: axis deviation. (05 Mar 2000) |
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| visual axis | The straight line extending from the object seen, through the centre of the pupil, to the macula lutea of the retina. Synonym: line of vision. (05 Mar 2000) |
| cephalocaudal axis | cephalocaudal axis |
| pelvic axis | A hypothetical curved line joining the centre point of each of the four planes of the pelvis, marking the centre of the pelvic cavity at every level. Synonym: axis pelvis, plane of pelvic canal. (05 Mar 2000) |
| cerebrospinal axis | The central nervous system; the brain and spinal cord. Synonym: encephalomyelonic axis, neural axis. (05 Mar 2000) |
| right axis deviation | A mean electrical axis of the heart pointing to the right of +90 |
| rotational axis | An imaginary line around which a removable partial denture tends to rotate. Synonym: rotational axis. (05 Mar 2000) |
| coeliac axis | Origin, abdominal aorta just below diaphragm; branches, left gastric, common hepatic, splenic. Synonym: truncus coeliacus, arteria coeliaca, coeliac artery, coeliac axis, Haller's tripod. (05 Mar 2000) |
| condylar axis | A line through the two mandibular condyles around which the mandible may rotate during a part of the opening movement. Synonym: condyle cord. (05 Mar 2000) |
| conjugate axis | Distance from the promontory of the sacrum to the upper posterior edge of the pubic symphysis. Synonym: anteroposterior diameter of the pelvic inlet, conjugata vera, conjugate axis, conjugate diameter of pelvic inlet, diameter mediana, internal conjugate, true conjugate. (05 Mar 2000) |
| craniofacial axis | A straight line passing through the mesethmoid, presphenoid, basisphenoid, and basioccipital bones. (05 Mar 2000) |
| principal optic axis | A line passing through the centre of the lens of a refracting system at right angles to its surface. (05 Mar 2000) |
| Helmholtz' axis ligament | <anatomy> A ligament forming the axis about which the malleus rotates; it consists of two portions extending from the anterior and the posterior border, respectively, of the tympanic notch to the malleus. Synonym: axis ligament of malleus. (05 Mar 2000) |
| hinge axis | An imaginary line around which the mandible may rotate through the horizontal plane. Synonym: hinge axis, mandibular axis. (05 Mar 2000) |
| secondary axis | Any ray passing through the optical centre of a lens. (05 Mar 2000) |