sagittally

adjective

1. of or like an arrow or arrowhead
2. Anat.
   1. designating or of the suture between the two parietal bones along the length of the skull
   2. designating, of, or in the longitudinal plane of this suture, regarded as dividing the body into right and left halves
   3. of or in any plane parallel to this

Origin: ModL sagittalis < L sagitta, arrow