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. 2016 Dec 30;9(1):14. doi: 10.3390/toxins9010014

Figure 6.

Figure 6

The illustration of the coronal section of the masseter from superficial to deep (A) and the expected muscle feature showing the masseteric bulging after the BTX-A injection into the masseter muscle during clenching (B). When masseter contracts, paradoxical masseteric bulging may occur at the superficial belly of the superficial part of the masseter because the DIT blocks the toxin’s diffusion. (SB: superficial muscle belly of superficial part of the masseter; DB: deep muscle belly of superficial part of the masseter; DP: deep part of the masseter; DIT: deep inferior tendon; SaM: superficial aponeurosis of the masseter).