Anatomy of the Face - Flipbook - Page 25
Musculus Labii Superioris Alaeque Nasi
ORIGIN:
ACTION:
UPPER FRONTAL PROCESS OF MAXILLA
DILATES NOSTRIL AND ELEVATES UPPER LIP
INSERTION:
CLINICAL SIGNIFICANCE:
SKIN OF LATERAL NOSTRIL AND UPPER LIP
LLSAN MODIFIES THE NASOLABIAL FOLD. THIS MUSCLE IS
RESPONSIBLE FOR MAKING AN EXPRESSION OF SADNESS OR
SERIOUSNESS.
FLARING THE NOSTRILS IS FUNCTIONALLY
IMPORTANT FOR DEEP BREATHING. IT IS ALSO IMPORTANT FOR
THE FACIAL EXPRESSION OF ANGER AND SNARLING. NASAL
SCRUNCH OR “BUNNY LINES” ARE PRODUCED WHEN
WRINKLING THE NOSE AND CAN BE ACCENTUATED WITH
SPEECH, SMILING OR FROWNING. THESE LINES RESULT FROM
THE CONTRACTION OF THE NASALIS MUSCLE, ESPECIALLY THE
TRANSVERSE PORTION, ALTHOUGH THE LEVATOR LABII
SUPERIORIS ALAEQUE NASI MUSCLE MAY CONTRIBUTE TO THEIR
APPEARANCE AS WELL.
BLOOD SUPPLY:
FACIAL ARTERY, INFRAORBITAL BRANCH OF MAXILLARY ARTERY
INNERVATION:
BUCCAL BRANCH OF FACIAL NERVE (VII)
LYMPHATIC DRAINAGE
DRAINS INTO THE MANDIBULAR LYMPH NODES
Musculus Nasalis
ORIGIN:
ACTION:
ALAR PART: FRONTAL PROCESS OF MAXILLA (SUPERIOR TO LATERAL
INCISOR)
TRANSVERSE PART: MAXILLA (SUPEROLATERAL TO INCISIVE FOSSA)
ALAR PART: DEPRESSES ALA LATERALLY, DILATES NOSTRILS
TRANSVERSE PART: WRINKLES SKIN OF DORSUM OF NOSE
INSERTION:
ALAR
PART:
SKIN
OF
ALA;
TRANSVERSE PART: MERGES WITH COUNTERPART AT DORSUM OF
NOSE
BLOOD SUPPLY:
SUPERIOR LABIAL, SEPTAL, AND LATERAL NASAL BRANCHES OF
FACIAL ARTERY;
INFRAORBITAL BRANCH OF MAXILLARY ARTERY
INNERVATION:
BUCCAL BRANCH OF FACIAL NERVE (CN VII)
CLINICAL SIGNIFICANCE:
NASALIS IS A PAIRED MUSCLE THAT COVERS THE DORSUM OF
THE NOSE. IT CONSISTS OF TWO PARTS; ALAR AND
TRANSVERSE. THE TRANSVERSE PART OF NASALIS WRINKLES THE
NASAL SKIN AND COMPRESSES THE NASAL APERTURE, HENCE
ITS OTHER NAME COMPRESSOR NARIS. THE ALAR PART DILATES
THE NOSTRILS AS IT PULLS THE ALA LATERALLY, THUS ITS NAME
DILATOR NARIS POSTERIOR.
ALL THESE ACTIONS OF NASALIS NORMALLY HAPPEN PRIOR TO
EACH INSPIRIUM, IN ORDER TO PREVENT THE EXTERNAL NASAL
VALVE FROM COLLAPSING. THIS FUNCTION OF NASALIS IS EVEN
MORE NOTABLE DURING DEEP BREATHING WHEN THESE
MOVEMENTS ARE MORE OBVIOUS, AS WELL AS IN AFFECTIVE
EMOTIONAL STATES SUCH AS ANGER.
LYMPHATIC DRAINAGE
DRAINS INTO THE PAROTID LYMPH NODES
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