Anatomy of the Face - Flipbook - Page 17
Orbicularis oris (Musculus orbicularis oris)
ORIGIN:
CLINICAL SIGNIFICANCE:
MEDIAL ASPECTS OF MAXIALLA AND MANDIBLE, PERIORAL SKIN
AND MUSCLES, MODIOLUS
ORBICULARIS ORIS IS A COMPLEX CIRCULAR MUSCLE THAT
SURROUNDS THE ORIFICE OF THE MOUTH AND FORMS THE
MAJORITY OF THE LIPS. MOST FIBERS ARE DERIVED FROM THE
BUCCINATOR, WHICH IS FOUND DIRECTLY LATERAL TO THE
ORBICULARIS ORIS ON BOTH SIDES. SUPERFICIAL TO THE
BUCCINATOR IS THE RISORIUS MUSCLE WHICH EXTENDS
HORIZONTALLY AND BLENDS WITH THE LATERAL EDGE OF THE
ORBICULARIS ORIS. IT BELONGS TO A LARGE GROUP OF
MUSCLES OF FACIAL EXPRESSION CALLED THE BUCCOLABIAL
GROUP. JUST LIKE THE OTHER MUSCLES OF THE BUCCOLABIAL
GROUP, THE FUNCTION OF ORBICULARIS ORIS IS TO CONTROL
THE SHAPE AND MOVEMENTS OF THE LIPS.
IT CLOSES,
PROTRUDES AND COMPRESSES THE LIPS. PERFORMING THESE
ACTIONS, ORBICULARIS ORIS FACILITATES SPEECH AND HELPS
IN PRODUCING VARIOUS FACIAL EXPRESSIONS, SUCH AS
ANGER, SADNESS AND OTHERS. MARGINAL PORTIONS OF
ORBICULARIS ORIS MUSCLE ARE ALSO REFERRED TO AS
THE LABIAL CORDS, AS BY CHANGING THEIR LENGTH AND
TENSION, THEY PRODUCE SOME CONSONANTAL (LABIAL)
SOUNDS. THESE CONSONANTS INCLUDE /P/ OF PEAS, THE /B/
OF BASKET THAT ARE PRODUCED BY BRINGING THE LIPS
TOGETHER; /F/ OF FEET OR /V/ OF VALLEY ARE PRODUCED BY
PRESSING THE LOWER LIP AGAINST THE UPPER TEETH AND
OTHERS. IN ADDITION, THE LABIAL CORDS CAN ACT AS
VIBRATING STRINGS AND ENABLE WHISTLING OR PLAYING A
WIND INSTRUMENT.
INSERTION:
SKIN AND MUCOUS MEMBRANE OF LIPS
BLOOD SUPPLY:
FACIAL ARTERY - SUPERIOR AND INFERIOR LABIAL ARTERIES
MAXILLARY ARTERY - MENTAL AND INFRAORBITAL ARTERIES
SUPERFICIAL TEMPORAL ARTERY - TRANSVERSE FACIAL ARTERY
INNERVATION:
BUCCAL BRANCH OF FACIAL NERVE (CN VII)
LYMPHATIC DRAINAGE
LYMPHATIC CHANNELS OF THE UPPER LIP AND COMMISSURE DRAIN
TO THE IPSILATERAL PREAURICULAR, INFRAPAROTID,
SUBMANDIBULAR, AND SUBMENTAL LYMPH NODES. THE LOWER LIP
LYMPHATICS DRAIN TO BOTH IPSILATERAL AND CONTRALATERAL
SUBMENTAL AND SUBMANDIBULAR LYMPH NODES. THE SECOND
NODAL STATION FOR BOTH LIPS IS THE UPPER DEEP JUGULAR NODES
AND OCCASIONALLY THE MIDDLE DEEP JUGULAR NODES.
ACTION:
CLOSES MOUTH, COMPRESSES AND PROTRUDES LIPS
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