axis /ax·is/ (ak´sis) pl. ax´es [L.]
1. a line through the center of a body, or about which a structure revolves; a line around which body parts are arranged.
2. the second cervical vertebra.ax´ial 
)
Axis. (A), (Top) transverse aspect; (bottom) superior aspect. (B), Position.
basibregmatic axis the vertical line from the basion to the bregma.
basicranial axis a line from basion to gonion.
basifacial axis a line from gonion to subnasal point.
binauricular axis a line joining the two auricular points.
celiac axis see under trunk.
dorsoventral axis one passing from the back to the belly surface of the body.
electrical axis of heart the resultant of the electromotive forces within the heart at any instant.
frontal axis an imaginary line running from right to left through the center of the eyeball.
axis of heart a line passing through the center of the base of the heart and the apex.
optic axis the hypothetical straight line passing through the centers of curvature of the front and back surfaces of a simple lens. 
)
Axes of the eye.
visual axis an imaginary line passing from the midpoint of the visual field to the fovea centralis.
Axes of the eye.
ba·si·breg·mat·ic axis (b  s -br g-m t  k)n. A vertical line connecting the basion to the bregma; the maximum height of the cranium. |
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