The anterior muscle of facial expression that inserts widely on the periosteum of the mandible is the
A) temporalis.
B) masseter.
C) lateral pterygoideus.
D) medial pterygoideus.
E) platysma.

Question

Quizplus · Accepted Answer

The muscle that inserts widely on the periosteum of the mandible is the platysma, which is a thin, sheet-like muscle located in the subcutaneous tissue of the neck and lower face. It originates from the fascia overlying the pectoralis major and deltoid muscles, and inserts on the lower border of the mandible and the corner of the mouth. This muscle helps to depress the lower lip and angle of the mouth, and also tenses the skin of the neck.

The Anterior Muscle of Facial Expression That Inserts Widely on the Periosteum