2. FIBRES ORIGIN INSERTION ORIENTATION FUNCTION INNERVATI
ON
BLOOD
SUPPLY
Superficia
l
Anterior two third of
lower border of
zygomatic arch &
adjoining zygomatic
process
Lower part of
lateral surface
of ramus
Fibres run
downward &
slightly
backward
Elevates
mandible
close the
mouth to
bite
Massetric
branch of
mandibular
nerve
Massetric
artery
Middle Anterior two third of
deep surface &
posterior one third
of lower border of
zygomatic arch
Middle part of
ramus
fibres pass
vertically
downwards
Deep Deep surface of
zygomatic arch
Upper part of
ramus &
coronoid
process pf
mandible
Fibres run
predominantly
in vertical
direction
MASSETER
3. TEMPORALIS
FIBRES ORIENTATION FUNCTION ORIGIN INSERTION BLOOD SUPPLY
Anterior Directed Mandible
raised
vertically
Lateral
aspect of
skull to full
extent of
superior
temporal
line
Anterior border
of coronoid
process &
anterior border
of ramus of
ramus as far
forward as last
molar
Deep
temporal
nerve
mandibula
r branch
Anterior,
posterior &
superficial
temporal
arteriesMiddle Fibres run
obliquely across
latera; aspect of
skull
Elevates &
retrude of
mandible
Posterio
r
Fibres aligned
horizontally
Elevation
with slight
retrusion
4. MEDIAL PTERYGOID
FIBRES ORIGIN INSERTION ORIENTATIO
N
FUNCTION INNERVATIO
N
BLOOD
SUPPLY
Superficial
head(small
slip)
Tuberosity of
maxilla &
adjoining
bone
Roughened
area on the
medial
surface of
angle &
adjoining
ramus of
mandible,
below &
behind
mandibular
foramen &
mylohyoid
groove
Fibres run
downwards,
backwards &
laterally
Elevates
mandible,
contributes
to protrusion
Nerve to
medial
pterygoid,
branch of
Mandibular
nerve
Pterygoid
branch of
maxillary
artery
Deep
head(large)
Medial
surface of
lateral
pterygoid
plate &
adjoining
process of
palatine
bone
5. LATERAL PTERYGOID
FIBRES ORIGIN INSERTION ORIENTATIO
N
FUNCTION INNERVATIO
N
BLOOD
SUPPLY
Superior Lower part of
lateral surface of
greater wing of
sphenoid & from
infratemporal
crest
Neck of
mandibular
condyle &
into front
margin of
articular disc
Backward,
upward&
outward
Stabilizes
condyle &
disc during
mandible
loading
Pterygoid
branch of
trigeminal
nerve
Pterygoid
branch of
maxillary
artery
Inferior Lateral surface of
lateral pterygoid
plate
Neck of
mandibular
condyle
Horizontal,
backward &
outward
Protrudes
mandible,
contributes
to lateral
movements
&
6. ACCESSORY MUSCLES
MUSCLE ORIGIN INSERTION ACTION INNERVATION BLOOD SUPPLY
Digastric Anterior belly
from inner side of
lower border of
mandible;
posterior belly
from mastoid
process of
temporal bone
Body of hyoid
bone via an
intermediate
tendon
Elevates hyoid bone &
depresses mandible as
in opening the mouth
Anterior
belly from
mandibular
division of
trigeminal
nerve;
posterior
belly from
facial nerve.
Anterior belly:
submental branch of
facial artery
Posterior belly:
occipital artery
Stylohyoi
d
Styloid process of
temporal bone
Body of hyoid
bone
Elevates hyoid bone &
draws it posteriorly
Facial nerve Facial artery
Mylohyoi
d
Inner surface of
mandible
Body of hyoid
bone
Elevates hyoid bone &
floor of mouth &
depresses mandible
Mandibular
division of
trigeminal
nerve.
Mylohyoid branch of
IAA & submental artery
of facial artery
Geniohyo
id
Inner surface of
mandible
Body of hyoid Elevates hyoid bone,
draws hyoid bone &
tongue anteriorly &
depresses mandible.
Cervical
nerve
Sublingual branch of
lingual artery
7. MUSCLE ORIGIN INSERTION ACTION INNERVATION BLOOD
SUPPLY
Buccinat
r
Upper fibre: from
maxilla opposite
molar teeth
Middle fibre : From
pterygomandibula
raphae
Lower fibre : from
mandible opposite
molar
Upper fibre:
to upper lip
Middle fibre :
decussate before
passing to the lips
Lower Fibres :
straight to lower lip
>Flattens cheek
against gums &
teeth
>Prevent
accumulation of
food in the
vestibule of
& to bring food
on occlusal table
during
Buccal branch
of facial nerve
Buccal artery,
branch of
maxillary
artery
