The<unk>  muscles are responsible for "wagging" the tail in tailed quadrupeds. These muscles are not as strong in the human, as tail-wagging is more demanding than the support function that the muscles serve in humans.
Levator ani
Morcellator
Dilator
Superior oblique muscle
Inferior oblique muscle
Corpus cavernosum penis
Palatal obturator
Corpora quadrigemina