The prostration report states:
أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ
Translation: I have been commanded to prostrate on seven bones (body parts).
Masajiduhu here means the parts of the body used in prostration: forehead and nose area, hands, knees and feet. Camphor is applied to these sites during preparation.