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. Author manuscript; available in PMC: 2010 Jan 29.
Published in final edited form as: Anat Rec A Discov Mol Cell Evol Biol. 2004 Feb;276(2):150. doi: 10.1002/ar.a.20002

Fig. 3.

Fig. 3

Sutural strain and masseter activity during mastication. An approximate baseline (neutral) strain was assessed for each power stroke of strain channels. The power strokes are indicated by vertical broken lines. For one power stroke in each tracing, the baselines are shown as horizontal broken lines. Compared to baseline, in 3-month-old pigs (#299, A), interfrontal suture (IF) power stroke strains were compressive (arrow), while those of the interparietal suture (IP) were tensile (arrowhead); in 7-month-old pigs (#307, B), the interparietal suture strain was still tensile (arrowhead) but the interfrontal suture demonstrated a tensile peak (arrowhead) followed by a smaller compression at each power stroke. Chewing side was identified by late activity in the ipsilateral masseter and/or contralateral temporalis compared to the contralateral masseter and ipsilateral temporalis. RMa, right masseter; LMa, left masseter; R: right chew; L, left chew. Scale bar, 200 microstrain.