Depressor anguli oris muscle
Structure
Structure
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The depressor anguli oris arises from the lateral surface of the [mandible](/wiki/Mandible "Mandible"). Its [fibers](/wiki/Fibre "Fibre") then converge. It is inserted by a narrow fasciculus into the angle of the [mouth](/wiki/Mouth "Mouth"). At its origin, it is continuous with the [platysma muscle](/wiki/Platysma_muscle "Platysma muscle"), and at its insertion with the [orbicularis oris muscle](/wiki/Orbicularis_oris_muscle "Orbicularis oris muscle") and [risorius muscle](/wiki/Risorius "Risorius"). Some of its fibers are directly continuous with those of the [levator anguli oris muscle](/wiki/Levator_anguli_oris "Levator anguli oris"), and others are occasionally found crossing from the muscle of one side to that of the other; these latter fibers constitute the [transverse muscle of the chin](/wiki/Transverse_muscle_of_the_chin "Transverse muscle of the chin").

The depressor anguli oris muscle receives its blood supply from a branch of the [facial artery](/wiki/Facial_artery "Facial artery").

### Nerve supply

The depressor anguli oris muscle is supplied by the [marginal mandibular branch](/wiki/Marginal_mandibular_branch_of_the_facial_nerve "Marginal mandibular branch of the facial nerve") of the [facial nerve](/wiki/Facial_nerve "Facial nerve").


From which surface of the mandible does the depressor anguli oris muscle arise?