Constrictor muscu-lus. The trumpeter's muscle, (from a trumpet). It is thus named because of its use in forcing the breath to sound the trumpet. It has two distinct beginnings on each side, one tendinous and fleshy from the lower jaw, between the. last dens molaris and the root of the fore part of the processus coronae; the other is fleshy from the upper jaw, between the last dens molaris and the processus pterigoides, from whose extremity also it arises tendinous, being continued between these two origins to the pterigo pharyngaeus on one side, and the mylo pharyngaeus on the other; from thence proceeding with straight fibres, and adhering to the membrane that covers the inside of the mouth, but without touching the gums of either jaw. It is inserted and lost in the angle of the lip. By its substance on each side it constitutes the cheeks, and through its middle the ductus salivalis superior passes. Its use is not only to move the cheeks with the lips, but also to contract the cavity of the mouth by bringing them inwards, and so thrust the meat between the teeth for its better comminution.