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Muscles of Mastication

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THE MAKING =)



n**d

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Trigeminal Nerve, Arterial and Venous Supply of Head & Neck (Clinical Session)

TRIGEMINAL NERVE (CNV)
Branches and Routes of the Maxillary and Mandibular Divisions

VENOUS DRAINAGE OF HEAD AND NECK
  1. Supratrochlear and Supraorbital veins form Angular vein.
  2. Angular vein is an upper tributary of the Facial vein.
  3. Superficial Temporal vein and Maxillary vein from Paroitd gland unite to form the Retromandibular vein.
  4. Posterior Auricular vein drains into Retromandibular vein.
  5. Retromandibular vein divides into two branches; Anterior and Posterior branch.
  6. Anterior branch of Retromandibular vein joins anterior Facial vein anteriorly.
  7. Posterior branch of Retromandiular vein joins the External Jugular vein posteriorly.
  8. Occipital vein drains into Suboccipital Venous Plexus in Suboccipital Triangle.
  9. There are emissary veins connecting deep veins to superficial veins.
           > Facial vein - Deep Facial vein
           > Intercranial Cavernous Sinus
           > Pharyngeal Venous Plexus

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Muscles of Facial Expression & Facial Nerve (Clinical Session)

Muscles of Facial Expression

Motor Branch of Facial Nerve




Temporal Branch innervates :
  • Frontalis
  • Obicularis Oculi
  • Corrugator Supercilii
  • Anterior & Superior Auricular Muscles


Zygomatic Branch innervates :
  • Obicularis Oris


Buccal Branch innervates :
  • Buccal region

Mandibular Branch innervates :
  • Muscles of Lower Lip
  • Chin

Cervical Branch innervates :
  • Platysma






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Temporomandibular Joint & Muscles Of Mastication (Clinical Session)


TEMPORALIS MUSCLE
  Origin : Entire temporal fossa (along inferiors temporal line)
  Insertion : Coronoid process (along apex, anterior and posterior border)
  Action : Elevate & Retrude mandible
  Nerve Supply :
Temporal branch of mandibular division of CNV


MASSETER MUSCLE

  Origin : Zygomatic Arch (medial &inferior border)
  Insertion : Angle of mandible, Inferior & lateral part of ramus 
  Action : Elevate mandible
  Nerve Supply : Masseteric branch of mandibular division of CNV




LATERAL PTERYGOID MUSCLE

  Origin : Lateral surface of lateral pterygoid plate, Greater wing of sphenoid 
  Insertion : Neck of condyle (pterygoid fovea), Articular disc & capsule of TMJ 
  Action : Depress, Protrude & Lateral excursion of mandible
  Nerve Supply : Lateral pterygoid branch of mandibular division of 
CNV

MEDIAL PTERYGOID MUSCLE
  Origin : Medial surface of lateral pterygoid plate, Palatine (pyramidal process) 
  Insertion : Medial surface of ramus, Angle of mandible 
  Action : Elevate, Protrude & Lateral excursion of mandible
  Nerve Supply : Medial pterygoid branch of mandibular division of CNV



Video Clip of Face/Mouth during Movement of the Jaws in All Directions
**

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