Indirect vision is the best method for examining the mentalis muscle. So, the correct answer is option c.
At the end of the chin, there is a pair of muscles called the mentalis. It serves as the lower lip's main muscle. The mentalis extends vertically from the lower lip to the bottom portion of the chin and arises from the mandible (lower jaw). For the lower lip to pout, this muscle gives it stability.
Together, these muscles shape face emotions involving the lips, chin, and cheeks. The mentalis muscle lifts, everts, and protrudes the lower lip while wrinkling the chin's skin to convey uncertainty and contempt. Patients with upper incisor protrusion or incompetent lips are more likely to have the mentalis muscle present. This muscle hyperfunction results from it.
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