Is it the 1-corpora cavernosa or 2-corpus spongiosum that runs in to glans of penis? Which During erection or sex causes feeling of rigidness in glans?

Corpus spongiosum. surrounds urethra & runs into glans. Each corpus spongiosum, there are two is like a rod which becomes engorged & traps blood during an erection. There are 2 corpora cavernosa (plural of cavernosum). They are above corpus spongiosum, which is in a groove between them.

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