The term TYPE OF MUSCLE can refer to four different types of muscles: ABDOMINAL, Flexor, Tensor, and Pectoral. ABDOMINAL muscles are located in the abdomen and are responsible for helping with posture and movement. Flexor muscles are located in the arms and legs and help with bending and flexing. Tensor muscles are located in the neck and back and help with posture and stability. Pectoral muscles are located in the chest and help with breathing and movement. Retentor muscles are located in the face and help with facial expressions.