Final answer:
The ischiocavernosus muscle is superior to the corpus spongiosum, which is the erectile tissue surrounding the urethra.
Step-by-step explanation:
The ischiocavernous muscle is superior to what structure? The answer to this question is C) Corpus spongiosum. The ischiocavernosus muscle is part of the deep muscles of the perineum and lies superior to the corpus spongiosum, which is the column of erectile tissue that surrounds the urethra and fills with blood during an erection. This muscle helps to maintain penile rigidity during erection by compressing the root of the corpora cavernosa and thereby obstructing venous return.