Zygomaticus major
Zygomaticus Major
The Zygomaticus major (/zaɪɡəˈmætɪkəs ˈmeɪdʒər/; from Greek ζυγωματικός, "zygomatic") is a muscle of the human body, specifically located in the facial region. It is one of the muscles involved in facial expression and is primarily responsible for the elevation of the corners of the mouth, such as when smiling or laughing.
Etymology
The term "Zygomaticus" is derived from the Greek word "ζυγωματικός" (zygōmatikos), which means "yoke". This is in reference to the zygomatic bone, the bone that forms the prominent part of the cheek and to which the zygomaticus major muscle is attached. The term "major" is a Latin term meaning "greater", used in anatomical nomenclature to distinguish this muscle from the smaller, similarly named Zygomaticus minor muscle.
Anatomy
The Zygomaticus major originates from the zygomatic bone and extends down to the angle of the mouth, where it inserts into the skin and muscle at the corner. It is innervated by the facial nerve (cranial nerve VII), specifically the buccal branch of the facial nerve.
Function
The primary function of the Zygomaticus major is to pull the angle of the mouth superiorly and laterally. This action is commonly associated with smiling or laughing. It also assists in the expression of other emotions, such as surprise or pleasure.
Related Terms
- Zygomaticus minor: A muscle that lies medial to the Zygomaticus major, also involved in facial expression.
- Facial muscles: A group of about 20 flat skeletal muscles lying under the facial skin, including the Zygomaticus major.
- Facial nerve: The seventh cranial nerve, which controls the muscles of facial expression, including the Zygomaticus major.
External links
- Medical encyclopedia article on Zygomaticus major
- Wikipedia's article - Zygomaticus major
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