Muscles around
the Mouth
By: Roshni Patel
Kanav Shah
Khushi Gandhi
Grp. : 158
Introduction
The facial muscles or muscles of facial
expression are subcutaneous muscles. They
are small and thin. Embryologically they
develop from mesoderm of the second
bramchial arch. All of them are inserted into
the skin and have no fascia. These muscles
work in coordinated manner to produce a
wide range of facial expressions and are
essential for various functions such as
speaking, eating, and expressing emotions.
Levator labii superioris
Musculus Levator labii superioris
Origin: Infra-orbital margin of maxilla
Insertion: Skin of upper lateral half of
upper lip
Function: Raises upper lip; helps form
nasolabial furrow
Levator labii superioris
alaeque nasi
Musculus levator labii superioris alaeque
nasi
Origin: Frontal process of maxilla
Insertion: Alae cartilage of nose and upper
lip
Function: Raises upper lip and opens
nostrils
Zygomatic minor
Musculus zygomaticus minor
Origin: Anterior part of lateral surface of
zygomatic bone
Insertion: Upper lip just medial to corner of
the mouth
Functions: Draws the upper lip upward
Zygomatic major
Musculus zygomaticus major
Origin: Posterior part of lateral surface of
zygomatic bone
Insertion: Skin at the corner of the mouth
Functions: Draws the corner of the mouth
upward and laterally
Risorius muscle
Musculus risorius
Origin: Fascia over masseter muscle
Insertion: Skin at the corner of the mouth
Functions: Retracts corner of mouth
Depressor anguli Oris
muscle
Musculus risorius
Origin: Oblique line of mandible below
canine, premolar, and first molar teeth
Insertion: Skin at the corner of mouth and
blending with orbicularis oris
Functions: Draws corner of mouth
downward and laterally
Levator anguli oris
Musculus levator anguli oris
Origin: Maxilla below infra-orbital foramen
Insertion: Skin at the corner of mouth
Functions: Raises corner of mouth; helps
form nasolabial furrow
Depressor labii inferioris
Musculus depressor labii inferioris
Origin: Anterior part of oblique line of
mandible
Insertion: Lower lip at midline; blends with
muscle from opposite side
Functions: Draws lower lip downward and
laterally
Mentalis
Musculus Mentalis
Origin: Mandible inferior to incisor teeth
Insertion: Skin of chin
Functions: Raises and protrudes lower lip
as it wrinkles skin on chin
Buccinator muscle
Musculus buccinator
Origin: Posterior parts of maxilla and
mandible; pterygomandibular raphe
Insertion: Blends with orbicularis oris and
into lips
Functions: Presses the cheek against teeth;
compresses distended cheeks
Orbicularis Oris muscle
Musculus orbicularis oris
Origin: From muscles in area; maxilla and
mandible in midline
Insertion: Forms ellipse around mouth
Functions: Compression, contraction, and
protrusion of lips
Thank you
By: Roshni Patel
Kanav Shah
Khushi Gandhi
Grp. : 158
