Hi, Thanks a lot buddy XD, here's the method I put the Youtube video down below, u can use alt+s to change size and E to extrude the object. This method is super useful when u want to create hair and lots of stuff. If u have any other question,ask me again ok!!!! XD, I will try my best to explain what I know. Have fun!!!!

I use path curve to create this, i duplicate it to make those branch, can also use low poly first to design the nerve + brance and then remesh it to high poly or subdivision .... If u have any other method pls share with me too .