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"Tail muscles mainly consisted of the following 6 muscles on both sides, M. sacrocaudalis dorsalis medialis (SDM), M. sacrocaudalis dorsalis lateralis (SDL), M. coccygeus lateralis (CL), M. coccygeus medialis (CM), M. sacrocaudalis ventralis lateralis (SVL) and M. sacrocaudalis ventralis medialis (SVM)."
So as each type of muscle is paired on each side of the tail that would be 12 muscles total.
Hope this helps you!