What is the symbolism of Ransom's heel wound?

Question

In *Perelandra*, the second book of CS Lewis's planets trilogy, the protagonist Ransom is wounded in the heel by the Un-Man/Weston. We learn in the third book, *That Hideous Strength*, that the wound never really heals.**What is the symbolism behind this wound?** Since there's so much hidden religious significance in the series and Lewis's works in general, I'm sure there's more to this than meets the eye: either the simple fact of the wound itself, how he got it, or maybe its precise placing in his heel.

Answer 1

I would suggest Genesis 3:15 as part of the answer: "...it shall bruise thy head, and thou shalt bruise his heel." (King James version).

Answer 2

Since there's so much hidden religious significance in the series and Lewis's works in general, I'm sure there's more to this than meets the eye: either the simple fact of the wound itself, how he got it, or maybe its precise placing in his heel.