obelion

obelion puhekieltä A craniometric point on the sagittal suture between the parietal foramen foramina near the lambdoid suture.
1993, Wolfgang Seeger, The Microsurgical Approaches to the Target Areas of the Brain, http://books.google.com.au/books?id=4XcjSdkHzpQC&pg=PA56&dq=%22obelion%22%7C%22obelions%22&hl=en&sa=X&ei=RLQsUenfOMqekQX6j4DABg&redir_esc=yv=onepage&q=%22obelion%22%7C%22obelions%22&f=false page 56,

Obelion is a nearly constant existing anthropological landmark. It is defined as the midpoint between both Foramina parietalia (for typical venous Emissaria connecting veins of galea with Sinus sagittalis sup.). Obelion is located on Suturus sagittalis.

The sagittal border usually runs directly posteriorly from the rounded frontal angle for about two-thirds of its length. This is the position of the obelion, and there may be a parietal notch in the bone (Fig. 4.37) after which the serrations on the border become more fringe-like as it slopes away towards the rounded occipital angle at the posterior fontanelle.

Significant suture closure is found in the lambda, obelion, anterior sagittal, and midcoronal locations, and complete obliteration is found in the bregma, pterion, and sphenofrontal locations.