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25 Cards in this Set
- Front
- Back
Boundaries of Temporal Fossa
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Superior and Posterior: Temporal lines
Anterior: Frontal and Zygomatic bones Inferior: Zygomatic arch and infratemporal crest of sphenoid Medial: Frontal, Parietal, Temporal, bones and greater wing of sphenoid Lateral: Temporalis Fascia |
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Contents of Temporal Fossa
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-Temporalis muscle and its fascia
-Nerve and blood supply of temporalis muscle -Fat |
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Boundaries of Infratemporal Fossa
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Anterior: Posterior surface of maxilla
Posterior: Tympanic plate, mastoid and styloid processes Superior: Infratemporal surface of greater wing of sphenoid Medial: Lateral pterygoid plate of sphenoid Lateral: Rammus and coronoid process of mandible |
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Infratemporal Fossa communications with other regions
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Superolaterally - Temporal fossa via gap bounded by zygomatic arch
Anteriorly - Orbit via inferior orbital fissure Medially - Pterygoid fossa via pterygomaxillary fissure Superiorly - Middle cranial fossa via foramen ovale and foramen spinosum Inferiorly - Neck |
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Contents of Infratemporal fossa
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-Medial and lateral pterygoid muscles
-Maxillary artery and branches -Pterygoid plexus of veins -Mandibular nerve and its branches -Otic ganglion -Chorda tympani -Posterior superior alveolar nerves and vessels |
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Otic Ganglion
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Parasympatheic ganglion containing postganglionic neurons which recieve preganglionnic neurons from the glossopharyngeal nerve (CN 9) via the lesser petrosal nerve.
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Chorda Tympani
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Branch of facial nerve. Contains preganglionic parasympathetic fibers destined for submandibular gland. Also contains taste sensory fibers for anterior 2/3s of tongue. Cell bodies are in geniculate ganglion. Hooks up with lingual nerve.
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Masseter Muscle
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Origin: Inferior and medial surface of zygomatic arch
Inserts: Lateral surface of ramus and angle of mandible Action: Closes mouth by elevating mandible, protrudes mandible Innervation: Mandibular division of Trigeninal Nerve |
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Temporalis Muscle
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Origin: Temporal Fossa and temporalis fascia
Inserts: Coronoid process and anterior border of rammus of mandible Action: Closes mouth by elevating mandible Innvervation: Mandibular region of trigeminal nerve |
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Medial Pterygoid Muscle
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Origin: Large head - medial side of lateral ptreygoid plate
Small head - tuberosity of maxilla Inserts: Medial surface of rammus and angle of mandible Action: Closes mouth by elevating the mandible; protrudes mandible Innervation: Mandibular branch of trigeminal Nerve |
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Lateral Pterygoid muscle
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Origin: Superior Head - Infratemporal surface of greater wing of sphenoid
Inferior head - Lateral surface of lateral pterygoid plate Inserts: TMJ capsule and condylar process of mandible Action: Opens mouth, protrudes mandible, moves mandible laterally Innervation: Mandibular branch of trigemnial nerve |
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Temporomandibular Joint (TMJ) Bones
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Head of mandible, mandibular fossa of temporal bone, articular tubercle of temporal bone.
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Temporomandibular Joint (TMJ) Ligaments
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Lateral temporomandibular ligament - Lateral thickening of loose capsular ligament
Sphenomandibular Ligament - From spine of sphenoid to lingula of mandible Stylomandibular Ligament - From styloid process to angle of mandible Fibrocartilagenous disk divides synovial cavity; is thicker at perimeter. |
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Temporomandibular Joint (TMJ)
Nerve Supply |
Auriculotemporal Nerve and Nerve to the masseter muscle
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Sphenomandibular Ligament
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From spine of sphenoid to the lingulaof mandible. A thickening of investing fascia that covers the pterygoid muscles. Maxillary artery travels between ligament and neck of mandible.
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Stylomandibular Ligament
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From styloid process to angle of mandible. A thickening portion of investing fascia of the parotid. Seperates parotid gland from submandibular gland.
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Maxillary Artery Path
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Travels between mandible and spenomandibular ligament in the infratemporal fossa. Gives off branches and leaves infratemporal fossa for pterygopalatine fossa via pterygomaxillary fissure.
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Middle Meningeal Artery
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Auriculotemporal nerve passes around it. Enters foramen spinosum which connects infratemporal fossa and cranial fossa. Is major blood supply for dura matter. Is the large artery seen when calvaria is removed.
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Accessory Meningeal Artery
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Passes through foramen ovale and supplies dura and trigeminal ganglion.
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Inferior Alveolar Artery
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Travels with inferior alveolar artery, enters mandible via mandibular foramen, and supplies lower teeth. Leaves mandible as mental artery to supply skin over mandible.
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Masseteric Artery
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Passes through mandibular notch to masseter muscle.
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Anterior/Posterior deep temporal arteries
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Enter deep surface of temporal muscle.
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Pterygoid branches
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Supply lateral and medial ptreygoid muscles.
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Buccal Artery
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Supplies buccinator
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Pterygoid plexus of veins
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Surrounds pterygoid muscles. Communicates with cavernous sinus by an emissary vein.
Communicates with inferior opthalmic vein via inferior orbital fissure. Communicates with facial vein via the deep facial vein Empties into maxillary vein. |