An Formal Web page of the United States govt. Here's how you know we're official. dot gov icon Good Vocabulary: similar words and phrases and phrases Substances & constructions in the body abductor accessorius acetylcholine ACL ACTH folate follicular foramen foramen ovale fornix myocardium myofibril myofibrillar myofilament myology tegument https://www.youtube.com/watch?v=A07qHOeWON8