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Lecture By
Dr.N.Mugunthan.MBBS,MS,DNB,MNAMS,PhD,MBA(Hosp.Adm.),
Associate Professor
MGMC&RI
Learning Objectives
• Muscles of mastication
1. Masseter
2. Temporalis
3. Lateral pterygoid
4. Medial pterygoid
• Temporomandibular joint (TMJ)
• Applied anatomy
©Dr.N.Mugunthan
Move the mandible during
mastication and speech
1. Masseter
2. Temporalis
3. Lateral pterygoid
4. Medial pterygoid
Developed from 1st
branchial arch
Supplied by mandibular
nerve
Muscles of mastication
©Dr.N.Mugunthan
Masseter muscle
©Dr.N.Mugunthan
Masseter muscle
 Quadrilateral in shape
 Covers lat. surface of
ramus of mandible
Has 3 layers
1. Superficial layer
2. Middle layer
3. Deep layer
©Dr.N.Mugunthan
Origin:
Superficial layer:
ant.2/3 lower border of
zygomatic arch,
zyg.process of maxilla
Middle layer:
ant.2/3 of deep surface &
post.1/3 of lower border of
zygomatic arch
Deep layer:
deep surface of zygomatic
arch
Masseter muscle cont…
©Dr.N.Mugunthan
• Insertion:
Lateral surface of ramus of
mandible
( superficial layer – lower
part, middle layer – middle
part & deep layer in the
upper part)
• Nerve supply :
Masseteric branch of
mandibular nerve (anterior
division)
• Action:
Elevation of mandible
(close the mouth)
Masseter muscle cont…
©Dr.N.Mugunthan
Temporalis muscle cont…
©Dr.N.Mugunthan
Temporalis muscle
Fan shaped
Fills temporal fossa
Origin:
Temporal fossa & fascia
covering temporalis muscle
Insertion:
Margin & deep surface of
coronoid process
Ant.border of ramus of
mandible
©Dr.N.Mugunthan
Nerve supply:
Temporal branches(2) from
anterior division of
mandibular nerve
Action:
• Elevates the mandible
(close the mouth)
• Post.fibres retract the
protruded mandible
Temporalis muscle cont…
©Dr.N.Mugunthan
Lateral pterygoid muscle
©Dr.N.Mugunthan
Lateral pterygoid muscle cont…
Short muscle
Conical shape
Muscle is surrounded by
pterygoid plexus of veins
Has 2 heads
1. Upper head (small)
2. Lower head (large)
Origin:
• Upper head :
Infratemporal surface &
crest of greater wing of
sphenoid
• Lower head:
Lateral surface of lateral
pterygoid plate ©Dr.N.Mugunthan
Insertion:
Pterygoid fovea (ant.surface of neck
of mandible)
Ant.margin of articular disc &
capsule of TMJ
Nerve supply :
A Branch from anterior division of
mandibular nerve
Action:
• Depress the mandible ( open the
mouth)
• Protrude the mandible
• Side to side movements -grinding
action (with opp. Medial pterygoid
turn the chin to same side)
Lateral pterygoid muscle cont…
©Dr.N.Mugunthan
Lateral pterygoid muscle cont…
©Dr.N.Mugunthan
Key muscle of infra temporal
fossa
Relations:
Superficial:
Masseter
Ramus of mandible
Tendon of temporalis
Maxillary artery
Deep :
Mandibular nerve
MMA
Sphenomandibular lig.&
Deep Head of medial
pterygoid
Relations of lateral pterygoid muscle
©Dr.N.Mugunthan
Structures emerging from
Upper border:
Deep temporal nerves
Masseteric nerve
Structures emerging from
Lower border:
Lingual nerve
Inferior alveolar nerve
MMA (passes upwards)
Structures passing between
Two heads:
Maxillary artery (enter)
Buccal branch of mandibular
nerve (comes out)
Relations of lateral pterygoid muscle cont…
©Dr.N.Mugunthan
Relations of lateral pterygoid muscle cont…
©Dr.N.Mugunthan
Medial pterygoid muscle
©Dr.N.Mugunthan
Medial pterygoid muscle
Quadrilateral in shape
Has 2 heads
1. Superficial head
2. Deep head
Origin:
Superficial head:
Tuberosity of maxilla
Deep head:
Medial surface of lateral
pterygoid plate
©Dr.N.Mugunthan
Insertion:
• Medial surface of angle &
adjoining ramus of mandible
Nerve supply:
• Nerve to medial pterygoid –
branch from main trunk of
mandibular nerve
Action:
• Elevates the mandible (close
the mouth)
• Protrusion of mandible
• Side to side movements –
grinding action ( with
opp.lateral pterygoid turn the
chin to opp.side)
Medial pterygoid muscle cont…
©Dr.N.Mugunthan
Superficial relations:
Upper part of muscle
separated from lateral
pterygoid by
• Lateral pterygoid plate
• Lingual nerve
• Inferior alveolar nerve
Upper part of muscle separated
from ramus of mandible by
• Above mentioned 2 nerves ,
• Maxillary artery &
Sphenomandibular ligament
Superficial relations of medial pterygoid
muscle
©Dr.N.Mugunthan
Deep relations of medial pterygoid muscle
Tensor veli palatini
muscle
Superior constrictor
muscle of pharynx
Styloglossus muscle
Stylopharyngeus
muscle
©Dr.N.Mugunthan
Deep relations of medial pterygoid muscle
cont…
©Dr.N.Mugunthan
Temporomandibular joint (TMJ)
Type : synovial joint
Variety : condylar
Articular surface:
• Upper – articular eminence
& mandibular fossa of
temporal bone
• Lower – head of mandible
 Articular surface covered
with fibrocartilage ©Dr.N.Mugunthan
TMJ - Articular surface
©Dr.N.Mugunthan
TMJ - Articular surface cont…
©Dr.N.Mugunthan
• Joint cavity divided into 2
compartment by articular
disc
• Upper : menisco-
temporal compartment
• Lower : menisco-
mandibular compartment
TMJ cont…
©Dr.N.Mugunthan
Ligaments
1. Fibrous capsule
2. Temporomandibular
ligament (lateral lig.)
3. Sphenomandibular
ligament
4. Stylomandibular
ligament
©Dr.N.Mugunthan
Articular disc
Degenerated insertion of
lateral pterygoid
Oval shape
Fibrocartilage
Divide the joint into upper
menisco-temp (gliding
movement) and lower
menisco-mandibular (gliding
& rotatory movement)
compartment
Periphery of disc attached to
capsule
Disc has ant.extension,
ant.thick band, intermediate
zone, post.thick band &
bilamellar region
©Dr.N.Mugunthan
Relations
• Anterior - lat.pterygoid &
masseteric nerve & vessels
• Posterior – parotid
gland,superficial
temp.vessels &
auriculotemporal nerve
©Dr.N.Mugunthan
• Medial - tympanic plate,
spine of
sphenoid,auriculotemp &
chordatympanic nerve,
middle meningeal artery
• Lateral – skin,
parotidomasseteric fascia,
parotid gland & temp.
branch of facial nerve
Relations cont…
©Dr.N.Mugunthan
• Superior – middle cranial
fossa, middle meningeal
artery
• Inferior –maxillary
vessels
Relations cont…
©Dr.N.Mugunthan
Blood supply
Arterial supply:
• Maxillary artery
• Superficial temporal
artery
Venous drainage:
• Corresponding veins
©Dr.N.Mugunthan
Nerve supply
• Auriculotemporal nerve
• Masseteric nerve
©Dr.N.Mugunthan
Movements of mandible
Depression – opening of mouth
Elevation – closing of mouth
Protrusion – forward movement
Retraction – backward movement
Side to side or lateral movements
©Dr.N.Mugunthan
Muscles producing movements of mandible
Depression (gravity
muscles)– lateral pterygoid
Elevation (antigravity
muscles)–
masseter,temporalis & medial
pterygoid
Protrusion – lateral &
medial pterygoid
Retraction – post.fibres of
temporalis
Side to side or lateral
movements - lateral &
medial pterygoid ( left.lateral
pterygoid with right medial
pterygoid turn the chin to left
side & vice versa)
©Dr.N.Mugunthan
Applied anatomy
• Trismus (spasm of
muscles of mastication)
• Locked jaw (masseter
spasm)
• Dislocation/subluxation
• Injury to articular disc
©Dr.N.Mugunthan
Summary
• Muscles of mastication
1. Masseter
2. Temporalis
3. Lateral pterygoid
4. Medial pterygoid
• Temporomandibular joint
(TMJ)
• Applied anatomy
©Dr.N.Mugunthan
If any queries click @ dr.mugunth111@gmail.com

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Muscles of mastication & TMJ Dr.N.Mugunthan

  • 2. Learning Objectives • Muscles of mastication 1. Masseter 2. Temporalis 3. Lateral pterygoid 4. Medial pterygoid • Temporomandibular joint (TMJ) • Applied anatomy ©Dr.N.Mugunthan
  • 3. Move the mandible during mastication and speech 1. Masseter 2. Temporalis 3. Lateral pterygoid 4. Medial pterygoid Developed from 1st branchial arch Supplied by mandibular nerve Muscles of mastication ©Dr.N.Mugunthan
  • 5. Masseter muscle  Quadrilateral in shape  Covers lat. surface of ramus of mandible Has 3 layers 1. Superficial layer 2. Middle layer 3. Deep layer ©Dr.N.Mugunthan
  • 6. Origin: Superficial layer: ant.2/3 lower border of zygomatic arch, zyg.process of maxilla Middle layer: ant.2/3 of deep surface & post.1/3 of lower border of zygomatic arch Deep layer: deep surface of zygomatic arch Masseter muscle cont… ©Dr.N.Mugunthan
  • 7. • Insertion: Lateral surface of ramus of mandible ( superficial layer – lower part, middle layer – middle part & deep layer in the upper part) • Nerve supply : Masseteric branch of mandibular nerve (anterior division) • Action: Elevation of mandible (close the mouth) Masseter muscle cont… ©Dr.N.Mugunthan
  • 9. Temporalis muscle Fan shaped Fills temporal fossa Origin: Temporal fossa & fascia covering temporalis muscle Insertion: Margin & deep surface of coronoid process Ant.border of ramus of mandible ©Dr.N.Mugunthan
  • 10. Nerve supply: Temporal branches(2) from anterior division of mandibular nerve Action: • Elevates the mandible (close the mouth) • Post.fibres retract the protruded mandible Temporalis muscle cont… ©Dr.N.Mugunthan
  • 12. Lateral pterygoid muscle cont… Short muscle Conical shape Muscle is surrounded by pterygoid plexus of veins Has 2 heads 1. Upper head (small) 2. Lower head (large) Origin: • Upper head : Infratemporal surface & crest of greater wing of sphenoid • Lower head: Lateral surface of lateral pterygoid plate ©Dr.N.Mugunthan
  • 13. Insertion: Pterygoid fovea (ant.surface of neck of mandible) Ant.margin of articular disc & capsule of TMJ Nerve supply : A Branch from anterior division of mandibular nerve Action: • Depress the mandible ( open the mouth) • Protrude the mandible • Side to side movements -grinding action (with opp. Medial pterygoid turn the chin to same side) Lateral pterygoid muscle cont… ©Dr.N.Mugunthan
  • 14. Lateral pterygoid muscle cont… ©Dr.N.Mugunthan
  • 15. Key muscle of infra temporal fossa Relations: Superficial: Masseter Ramus of mandible Tendon of temporalis Maxillary artery Deep : Mandibular nerve MMA Sphenomandibular lig.& Deep Head of medial pterygoid Relations of lateral pterygoid muscle ©Dr.N.Mugunthan
  • 16. Structures emerging from Upper border: Deep temporal nerves Masseteric nerve Structures emerging from Lower border: Lingual nerve Inferior alveolar nerve MMA (passes upwards) Structures passing between Two heads: Maxillary artery (enter) Buccal branch of mandibular nerve (comes out) Relations of lateral pterygoid muscle cont… ©Dr.N.Mugunthan
  • 17. Relations of lateral pterygoid muscle cont… ©Dr.N.Mugunthan
  • 19. Medial pterygoid muscle Quadrilateral in shape Has 2 heads 1. Superficial head 2. Deep head Origin: Superficial head: Tuberosity of maxilla Deep head: Medial surface of lateral pterygoid plate ©Dr.N.Mugunthan
  • 20. Insertion: • Medial surface of angle & adjoining ramus of mandible Nerve supply: • Nerve to medial pterygoid – branch from main trunk of mandibular nerve Action: • Elevates the mandible (close the mouth) • Protrusion of mandible • Side to side movements – grinding action ( with opp.lateral pterygoid turn the chin to opp.side) Medial pterygoid muscle cont… ©Dr.N.Mugunthan
  • 21. Superficial relations: Upper part of muscle separated from lateral pterygoid by • Lateral pterygoid plate • Lingual nerve • Inferior alveolar nerve Upper part of muscle separated from ramus of mandible by • Above mentioned 2 nerves , • Maxillary artery & Sphenomandibular ligament Superficial relations of medial pterygoid muscle ©Dr.N.Mugunthan
  • 22. Deep relations of medial pterygoid muscle Tensor veli palatini muscle Superior constrictor muscle of pharynx Styloglossus muscle Stylopharyngeus muscle ©Dr.N.Mugunthan
  • 23. Deep relations of medial pterygoid muscle cont… ©Dr.N.Mugunthan
  • 24. Temporomandibular joint (TMJ) Type : synovial joint Variety : condylar Articular surface: • Upper – articular eminence & mandibular fossa of temporal bone • Lower – head of mandible  Articular surface covered with fibrocartilage ©Dr.N.Mugunthan
  • 25. TMJ - Articular surface ©Dr.N.Mugunthan
  • 26. TMJ - Articular surface cont… ©Dr.N.Mugunthan
  • 27. • Joint cavity divided into 2 compartment by articular disc • Upper : menisco- temporal compartment • Lower : menisco- mandibular compartment TMJ cont… ©Dr.N.Mugunthan
  • 28. Ligaments 1. Fibrous capsule 2. Temporomandibular ligament (lateral lig.) 3. Sphenomandibular ligament 4. Stylomandibular ligament ©Dr.N.Mugunthan
  • 29. Articular disc Degenerated insertion of lateral pterygoid Oval shape Fibrocartilage Divide the joint into upper menisco-temp (gliding movement) and lower menisco-mandibular (gliding & rotatory movement) compartment Periphery of disc attached to capsule Disc has ant.extension, ant.thick band, intermediate zone, post.thick band & bilamellar region ©Dr.N.Mugunthan
  • 30. Relations • Anterior - lat.pterygoid & masseteric nerve & vessels • Posterior – parotid gland,superficial temp.vessels & auriculotemporal nerve ©Dr.N.Mugunthan
  • 31. • Medial - tympanic plate, spine of sphenoid,auriculotemp & chordatympanic nerve, middle meningeal artery • Lateral – skin, parotidomasseteric fascia, parotid gland & temp. branch of facial nerve Relations cont… ©Dr.N.Mugunthan
  • 32. • Superior – middle cranial fossa, middle meningeal artery • Inferior –maxillary vessels Relations cont… ©Dr.N.Mugunthan
  • 33. Blood supply Arterial supply: • Maxillary artery • Superficial temporal artery Venous drainage: • Corresponding veins ©Dr.N.Mugunthan
  • 34. Nerve supply • Auriculotemporal nerve • Masseteric nerve ©Dr.N.Mugunthan
  • 35. Movements of mandible Depression – opening of mouth Elevation – closing of mouth Protrusion – forward movement Retraction – backward movement Side to side or lateral movements ©Dr.N.Mugunthan
  • 36. Muscles producing movements of mandible Depression (gravity muscles)– lateral pterygoid Elevation (antigravity muscles)– masseter,temporalis & medial pterygoid Protrusion – lateral & medial pterygoid Retraction – post.fibres of temporalis Side to side or lateral movements - lateral & medial pterygoid ( left.lateral pterygoid with right medial pterygoid turn the chin to left side & vice versa) ©Dr.N.Mugunthan
  • 37. Applied anatomy • Trismus (spasm of muscles of mastication) • Locked jaw (masseter spasm) • Dislocation/subluxation • Injury to articular disc ©Dr.N.Mugunthan
  • 38. Summary • Muscles of mastication 1. Masseter 2. Temporalis 3. Lateral pterygoid 4. Medial pterygoid • Temporomandibular joint (TMJ) • Applied anatomy ©Dr.N.Mugunthan
  • 39. If any queries click @ dr.mugunth111@gmail.com