MUSCLES OF MASTICATION AND MAXILLARY ARTERY AND BRANCHES

MUSCLES OF MASTICATION AND MAXILLARY ARTERY AND BRANCHESDR. PRATIK MISTRY

MUSCLES OF MASTICATIONMasseterTemporalisLateral pterygoidMedial pterygoid

MASSETERQuadrilateral muscleOrigin:Insertion:Nerve supply:Action:

TEMPORAL REGION AND TEMPORALIS MUSCLEBoundaries:Contents:Temporalis and its fasciaDeep temporal nerve and vesselsAuriculotemporal nerveSuperficial temporal vessels

TEMPORALIS MUSCLE AND ITS FASCIAFan shapeOrigin:Insertion:Nerve supply:Action:

Temporal fascia

INFRATEMPORAL FOSSABoundariesContents:Lateral & medial pterygoid musclesMaxillary artery and its branchesPterygoid venous plexusMandibular nerve and its branches, chorda tympany nerve, otic ganglion

LATERAL PTERYGOIDKey muscleOrigin:Insertion:Nerve supply:Action:Relations:

MEDIAL PTERYGOIDQuadrilateral muscleOrigin:Insertion:Nerve supply:Action:

TRISMUSSpasm of masseter in the TETANUS .Produce lock jaw

MAXILLARY ARTERYAlso known as internal maxillary arteryOrigin within parotid gland behind the neck of mandibleDivided into 3 parts by lateral pterygoid muscle

1ST PART (MANDIBULAR PART)Between neck & lateral pterygoid muscleRelated above with auriculo-temporal nerveIts branches accompany branches of the mandibular nerve

BRANCHES FROM 1ST PARTFIVE IN NUMBERDeep auricular A.Ant. tympanic A.Middle meningeal A.Accessory meningeal A.Inferior alveolar (dental) A.

MIDDLE MENINGEAL ARTERYLargest meningeal branch & clinically most importantCourse and relations

EXTRADURAL HAEMATOMA (HAEMORRAGE)

2ND PART (PTERYGOID PART)Upward & forwardLie either superficial or deep to the lower head of the lateral pterygoid muscleBranches accompany branches of the mandibular nerve

BRANCHES FROM 2ND PARTFOUR IN NUMBERMUSCULAR BRANCHESDeep temporal A. two in numberPterygoid branchesMasseteric arteryBuccal artery

3RD PART (PTERYGO-PALATINE PART)Enters pterygo-palatine fossa by passing between two heads of lateral pterygoid through pterygo-maxillary fissure and divide into branchesBranches accompany the branches of maxillary nerve

BRANCHES FROM 3RD PARTSIX IN NUMBERPosterior superior alveolar (dental) A.Infra-orbital A.Greater palatine A.Pharyngeal A.Artery of pterygoid canalSpheno-palatine A.

PTERYGOID VENOUS PLEXUSNetwork of veins around and within lateral pterygoidDrained by maxillary veinPeripheral heart to pump stagnant blood by lateral pterygoid contraction

Communicate withInf. Ophthalmic veinCavernous sinus by emissary veinFacial vein

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