1. Anterior to the axis of the body or a limb, the latter being in the anatomical position. 2. Denoting the portion of a limb bud that lies cranial to the axis of the limb : the radial aspect of the upper limb and the tibial aspect of the lower limb.
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pre·ax·i·al .prē-'ak-sē-əl adj situated in front of an axis of the body <\preaxial muscles>
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pre·ax·i·al (pre-akґse-əl) anterior to an axis; in anatomical usage, this refers to the lateral (radial) aspect of the upper limb, and the medial (tibial) aspect of the lower limb.Medical dictionary. 2011.