Figure 4.

Circular representation of the human skull network and the NNM. In general, bones in the NNM are less connected than in the human skull; the most extreme case is the ethmoid, with 5 vs. 13 connections, respectively. Missing connections do not form in the NNM precisely because they deviate from the main assumption of the model: unconstrained bone growth. Labels: occ, occipital; tem, temporal; par, parietal; sph, sphenoid; zyg, zygomatic; fro, frontal; eth, ethmoid; nas, nasal; max, maxilla; lac, lacrimal; pal, palatine; con, inferior nasal concha; vom, vomer; l, left; r, right.