There are various workarounds to emulate this. Some suggestions can be found here: Animate Hide Edge?
It occurs to me with the addition of animated shape ordering in v.11, you could make the segments their own shape (naming them helps tremendously) and move them below a larger shape to hide them. This diagram shows it better than I can explain:
NOTE: The bottom part is illustrating the shape order only. Shapes can share points, so this isn't 20 points (5 sets of 4 points), but only 4 points. Also, the base shape has a stroke with the same color as the fill.
To make this work, in the layer settings, under General, enable "Allow animated layer effects' and under Vectors, enable "Animated shape order".
Here's one example of how this might work in the shoulder area, using a smart bone actions in the upper arm:
It's kind of an obvious thing really, but I hope this is helpful anyway.
Being able to expose the line in two directions is really useful. Here's an example of a 
(I guess for ASP, when in doubt press the alt key 
