Here's a breakdown:
* Corpora cavernosa: These are two cylindrical masses of erectile tissue located on the dorsal side of the penis. They are primarily responsible for penile erection.
* Corpus spongiosum: This is a single, cylindrical mass of erectile tissue located on the ventral side of the penis. It surrounds the urethra and extends to the tip of the penis, forming the glans penis.
The corpus spongiosum plays several important roles:
* Urethral passage: It forms a pathway for the urethra, allowing urine and semen to pass through.
* Erection: It contributes to penile erection, although to a lesser extent than the corpora cavernosa.
* Ejaculation: During ejaculation, it helps to propel semen out of the urethra.
It's important to note that the corpus spongiosum doesn't fully engorge during erection. This ensures that the urethra remains open, allowing for the passage of semen.
