Cat limb muscles from life.
Hi queue, I missed you!
Here are shark epaxial muscles (dorsal or back-side muscles), hypaxial muscles (ventral or stomach-side muscles), horizontal septum that separates both sets of muscles, and then the siphon adductors (abductors? Still confused STOP QUOTING ME) in the modified clasper fins of the mail as well as the tendons where all them hypaxials and epaxials insert into the tail.
SPOT ALL THEM SHARK BITS in the drawings, it’s a FUN GAME. Also the shark on top is smug as hell in the drawing. He is not nearly so smug in the photographs I referenced these from in the lab manual.