How to create a muscle fiber pattern on a mesh

I want to be able to create muscle fiber patterns on a mesh.

it could be good you give more detail. Because what you show is surely a texture like this one.

from this model

To do that you must model the muscle and then apply a texture. For sure it is doable in Rhino, not sure it is the best tool specially for texture painting.

Why Grasshopper to do that ?
To do that ?

sorry about that. I meant I would to put a pattern similar to this one

on a mesh or subd. I want to be able to change the amount of striations on the mesh or subd like this wavy pattern