17. Peroneus longus (helps to keep foot arched).
18. Annular ligament of ankle.
19. Platyama.
20. Brachialis (moves elbow joint).
21. Biceps (flexor of arm).
22. Supinator longus (turns hand).
23. Extensor carpi radialis (extensor of forearm and wrist).
24. Flexor carpi radialis (bends wrist and turns hand).
25. Rectus abdominis (retracts abdominal wall).
26 and 27. Vastus externus and internus. These, with 14 and an abductor muscle, together make up the quadriceps extensor, the largest muscle in the body. It extends the leg.