An official Web site of the United States govt. This is how you are aware of we are official. dot gov icon SMART Vocabulary: related text and phrases Substances & structures in your body abductor accessorius acetylcholine ACL ACTH folate follicular foramen foramen ovale fornix myocardium myofibril myofibrillar myofilament https://www.youtube.com/watch?v=A07qHOeWON8