Zygomaticus

Zygomaticus refers to two muscles of the human facial structure, namely the Zygomaticus major and the Zygomaticus minor. These muscles are integral to facial expressions, particularly those involving the smile.

Zygomaticus Major

The Zygomaticus major is a muscle that controls facial expression, drawing the mouth's angle upward and outward. It originates from the zygomatic bone (the cheekbone) and extends to the angle of the mouth. The zygomaticus major is responsible for the movement of the upper lip, allowing humans to express emotions such as happiness or amusement.

Zygomaticus Minor

The Zygomaticus minor is a muscle that controls facial expression, drawing the upper lip upward. It originates from the malar bone and extends to the orbicularis oris. The zygomaticus minor is responsible for the movement of the upper lip, contributing to the expression of complex emotions.

Function

The zygomaticus muscles are involved in facial expressions, particularly smiling. They pull the corners of the mouth upward and backward, contributing to the characteristic shape of a smile. These muscles are controlled by the facial nerve, which carries signals from the brain to the muscles of the face.

Clinical Significance

Damage to the zygomaticus muscles or the facial nerve that controls them can result in facial paralysis, a condition known as Bell's palsy. This can cause an inability to smile or make other facial expressions. Treatment typically involves physical therapy to regain control of the facial muscles.

See Also

• Facial muscles
• Facial nerve
• Bell's palsy