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This image illustrates several of the facial muscles, which are primarily responsible for facial expression. Starting from the top, the frontalis muscle covers the forehead. Its main function is to raise the eyebrows and wrinkle the forehead.

The orbicularis oculi muscle encircles the eye socket. It acts to close the eyelids and is involved in the various facial expressions such as blinking and winking.

Moving to the mid-face, the nasalis muscle is located over the bridge of the nose. It compresses the bridge and depresses the tip of the nose, playing a significant role in expressions like flaring the nostrils.

Below this muscle, we have the zygomaticus minor and the zygomaticus major, both of which originate from the zygomatic bone. The zygomaticus minor helps to elevate the upper lip, contributing to expressions such as smiling. The zygomaticus major is larger and also elevates and draws the upper lip outward.

Near the mouth, the orbicularis oris acts like a sphincter for the mouth, allowing actions like puckering the lips and closing the mouth.

On the lower side of the face, the depressor labii inferioris is responsible for lowering the bottom lip, while the depressor anguli oris draws the corners of the mouth downward and laterally, which is often associated with frowning or sadness.

The buccinator muscle is situated deep in the cheek. It pulls the cheek against the teeth and is used in actions like blowing and chewing.

Finally, the masseter muscle is a thick, rectangular muscle at the angle of the jaw. This muscle is a primary mover in mastication (chewing), elevating the mandible to close the mouth and clench the teeth.

Together, these muscles not only allow us to make a wide array of facial expressions but also have functional roles in eating and breathing.

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