Several muscles that are not positioned within the area defined as the face are described as muscles of facial expression. Like the true facial muscles, they are also derived from the second pharyngeal arch, and they receive innervation from the facial nerve (CN VII). They include the following muscles:

Platysma - a wide and flat sheet-like muscle located in the anterior compartment of the neck right below the skin. It is surrounded by the superficial cervical fascia. The platysma is a paired thin superficial neck muscle that extends between the upper aspect of the thorax and shoulders and the lower aspect of the face. It tenses the skin of the lower aspect of the face and the anterior aspect of the neck. The platysma also contributes to the depression of the mandible and the angle of the mouth, producing facial expressions of disgust, surprise and horror.
Auricular muscles - three paired muscles that are located around the auricle; they are known as the anterior auricular muscle, superior auricular muscle, and posterior auricular muscle.

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Other facial muscles (platysma and auricular muscles)