It is lowered by the depressor labii inferioris muscle and the orbicularis oris borders it inferiorly.
2.
Running backward and upward from each mental tubercle is a faint ridge, the oblique line, which is continuous with the anterior border of the ramus; it affords attachment to the depressor labii Inferioris ( Quadratus labii inferioris ) and depressor anguli oris ( Triangularis ); the platysma is attached below it.
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