(aks’-is) 1. An imaginary line passing through the center of a body. 2. The second cervical vertebra. A., Basicranial, in craniometry, a line drawn from the basion to the middle of the anterior border of the cerebral surface of the sphenoid bone. A., Basifacial, in craniometry, a line drawn from the anterior border of the cerebral surface of the sphenoid to the alveolar point. A., Binauricular, in craniometry, the imaginary line joining the two auricular points. A., Cerebrospinal, the central nervous system. A. Cylinder It is also called the axis-cylinder of Purkinje. A., Frontal A., Optic, the line from the comeal apex to the macula lutea. A., Optical, an imaginary line passing from the center of the eye-piece of a microscope through the body, objective, stage and sub-stage, to the mirror. A., Sagittal A., Visual, the line from the object through the nodal point to the macula.
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