Anatomy _ BDS level 4 _ Muscles of mastication

1. MUSCLES OF MASTICATION
By: Olla BaEissaBa
The muscle ORIGIN: INSERTION: NERVE SUPPLY: ACTION:
TEMPORALIS
floor of
temporal fossa
& deep surface
of temporal
fasica
the tendon
passes deep to
zygomatic arch
to be inserted
to all coronoid
process (except
its lateral surface)
2 deep
temporal
nerves from
anterior
division of
mandibular
nerve
- Elevation of mandible
- Its posterior fibers
retract the mandible
MASSETER
lower border &
inner surface of
zygomatic arch
lateral surface
of ramus of
mandible
from anterior
division of
mandibular
nerve
- Elevation of mandible
- Protrusion of mandible
(when muscles on both
sides act together)
- Side-to-side movement
(when muscles on both
sides act alternatively)
LATERAL
PTERYGOID
Upper head:
infratemporal
surface of
greater wing of
sphenoid
Lower head:
lateral surface
of lateral
pterygoid plate
pterygoid
fovea (in front
of neck of
mandible)
+ capsule &
articular disc of
TMJ
from anterior
division of
mandibular
nerve
- Pulls the condylar
process forward to
depress the mandible
- Protrusion of mandible
(when muscles on both
sides act together)
- Side-to-side movement
(when muscles on both
sides act alternatively)
MEDIAL
PTERYGOID
Superf. head:
tuberosity of
maxilla
Deep head:
medial surface
of lateral
pterygoid plate
medial surface
of ramus &
angle of
mandible
from trunk of
mandibular
nerve
- Elevation of mandible
- Protrusion of mandible
(when muscles on both
sides act together)
- Side-to-side movement
(when muscles on both
sides act alternatively)
ALL MUSCLES OF MASTICATION:
Elevate mandible EXCEPT: Lateral pterygoid
Protrude mandible EXCEPT: Temporalis
Are supplied by anterior division of mandibular nerve EXCEPT: Medial pterygoid