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axis cylinderan AXON.
pl. axes [L., Gr.]
1. a line through a center of a body, or about which a structure revolves.
2. the second cervical vertebra.
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. See also mean electrical axis.
external bulbar axis
the optical axis that connects the anterior and posterior poles of the eyeball. Called also optic 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.
see external bulbar axis (above).
a line passing through the apex of the bony orbit and the center of the opening of the orbit.
an imaginary line extending through the anterior and posterior poles of the eye.
an imaginary line passing from the midpoint of the visual field to the fovea centralis.