How do you make in "urchin" in illustrator

Hi everyone,
So, I'm new to these boards; if there is a problem in how I ask this, please let me know
I am making figures for research I am doing that involves sticking molecules on nanoparticles.
In illustrator, what I've done so far was making a semi circle and rotated it to form a sphere (my nanoparticle), and now I'm working on coating it so I have a simplified model of what I am pursuing. Basically, I want it to look like an "urchin": a ball with protrusions around it.
At first, I tried making a symbol of these protrusions and mapping it on the surface, but I can't extrude and bevel the symbol (unless I am missing something). Using invisible geometry won't work either because, well, I want to show the particle at the center of it all, too!
If you want the file I'm working with to see what I've done so far, all you need to do is ask.
Thanks!

Illustrators 3D effects don't support bump mapping.
You'll have to illustrate it manually.

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