Sea dragon

The sea dragon eats stinging hydroids but it does not digest everything, it plants some of the creature’s cells in its own skin and lets them grow. This is why the sea dragon can give a painful sting because it has eaten the stinging cells of a hydroid and they are growing fully functional inside of it. It is also why they spread out under the sun because they have eaten algae and are growing a veggie patch in their own flesh.
My question is, what if they ate your brain, would your brain cells continue to grow inside of it?
Green Island, Ocean free