Botulinum Toxin Injection-Site Selection for a Smooth Shoulder Line: An Anatomical Study

Figure 3

Cryosections from the trapezius muscle of a human specimen. The reference line (100%) indicates the start point, which is the most lateral point of external occipital protuberance and the most lateral point of the acromion. (a) 20–40%; (b) 40–60%; (c) 60–80%; (d) 80–100% of reference line.

(a)

(b)

(c)

(d)