Anatomy of the Face - Flipbook - Page 22
Musculus Zygomaticus Major
ORIGIN:
ACTION:
(POSTERIOR PART OF) LATERAL ASPECT OF ZYGOMATIC BONE
ELEVATES AND EVERTS ANGLE OF MOUTH
INSERTION:
CLINICAL SIGNIFICANCE:
MODIOLUS, BLENDS WITH MUSCLES OF UPPER LIP
ZYGOMATICUS MAJOR IS A THIN PAIRED FACIAL MUSCLE THAT
EXTENDS DIAGONALLY FROM THE ZYGOMATIC BONE (HENCE
THE NAME) TO THE ANGLE OF THE MOUTH. IT BELONGS TO
THE BUCCOLABIAL GROUP OF FACIAL MUSCLES. THESE
MUSCLES FORM THE STRUCTURE AND CARRY OUT THE
FUNCTIONS OF THE CHEEKS AND LIPS. IN COORDINATION WITH
OTHER BUCCOLABIAL MUSCLES, IT FACILITATES SPEECH AND
CREATES FACIAL EXPRESSIONS. ALONG WITH RISORIUS,
ZYGOMATICUS MAJOR CONTRIBUTES TO SMILING AND
LAUGHING, WHICH IS WHY THEY ARE DEEMED THE “LAUGHING
MUSCLES”.
BLOOD SUPPLY:
SUPERIOR LABIAL ARTERY (FACIAL ARTERY)
INNERVATION:
BUCCAL AND ZGYOMATIC BRANCHES OF FACIAL NERVE (CN VII)
LYMPHATIC DRAINAGE
DRAINS INTO THE MANDIBULAR NAD PAROTID LYMPH NODES
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