Which is the only muscle in the human body that is NOT attached at both the ends?

The Bitter taste receptors are located at the back of the tongue . These taste receptors confer the protection against the ingested toxic substances which provoke the repulsion towards the bitter food. They are also the most sensitive taste receptors in the tongue. The adductors are a group of muscles that primarily function to adduct the femur at the hip joint. Although they are all located somewhere along the medial side of the thigh, they all originate in different places at the front of the pelvis.