For purposes of the hearing conservation program, employee noise exposures shall be computed in accordance with appendix A and Table G-16a, and without regard to any attenuation provided by the use of personal protective equipmentâ (1910.95(c)(1)).
The platysma is a superficial muscle that overlaps the sternocleidomastoid. It is a broad sheet arising from the fascia covering the upper parts of the pectoralis major and deltoid; its fibers cross the clavicle, and proceed obliquely upward and medially along the side of the neck.
Platysma Description. Behind and below the symphysis menti, which is the external surface of the mandible, the fibers of the anterior and posterior regions of the muscle sheet interconnects, and crosses the jawbone. It inserts into the inferior border of mandible and skin over the lower region of the face.