the third research the muscles of opening the mouth. sheikh alrais may god have mercy on him said as for the muscles of opening and lowering the jaw to his saying as for the muscles of chewing they are two muscles.
البحث الثالث عضل فغر الفم قال الشيخ الرئيس رحمة الله عليه وأما عضل الفغر وإنزال الفك إلى قوله وأما عضل المضغ فهما عضلتان.