a. Anat. [f. EP- + L. axi-s + -AL.] Situated on or above the axis (of the body): said of muscles, cartilages, etc., that lie upon or above the vertebral column looked at in a horizontal position.
1872. Mivart, Elem. Anat., 219. Such arches, as they extend above the axis, have been called epaxial arches.
Hence Epaxially adv., in an epaxial position or direction.