how muscles wrapping is considered in Joint Reaction Analysis

[Giulia Ghielmi]

Hello everyone!
I'm writing you because I need help to understand how Joint Reaction Analysis works, in particular how muscle forces are considered in the equilibrium equation for each time step.
For each time step I have equation made by F muscle + F weight + F constrain = F inertia.
When I haven't wrapping on the body I can use the plugin to extract the muscle lines, but it seems to be not useful when there is it. In this last case, how the wrapping affects Joint Reaction Analysis? How can I find information about which muscle forces are considered (also their directions) in Joint Reaction Analysis?

Thanks in advance