Compression and tension levels arising from jaw movements.

A) Hydrostatic stress field averaged across one cycle of mouth opening and closure (termed “average stress”) at 4 and 4.5 dpf. Red arrowheads indicate a peak of compression at the level of the jaw joint. Results are displayed in 3D views and in one section in the mid-lateral plane. B) Hydrostatic stress fields at peak opening and peak closure showing a change from compression to tension along the ventrodorsal axis. Results are displayed in 3D views and in one section in the mid-lateral plane. Results in the mid-ventral plane are displayed in S3 Fig. An: Anterior, Dr: Dorsal, L: Lateral, M: Medial, P: Posterior, V: Ventral.