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23 Cards in this Set
- Front
- Back
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Location on the skull
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Posterior to maxilla
Inferior to zygomatic arch Deep to ramus of mandible Superificial to lateral pterygoid plate (sphenoid bone) |
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Nearby Bony landmarks
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Foramen ovale
Foaramen spinosum pterygopalatine fossa (PT Fossa) Pterygomaxillary fissure Sphenopalatine foramen articular tubercle mandibular fossa styloid process SAM SOld PSP |
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The IT Fossa is an important location because of the proximity of:
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Maxillary artery
Mandibular divisions of the trigeminal nerve (V3) Chorda tympani (facial nerve) Masticatory muscles and TM Joint |
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Maxillary artery: Where does it arise? How does it course?
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Arises from external carotid artery
-posterior to the neck of mandible -travels anteriorly across IT fossa -found superficial or deep to LATERAL PTERYGOID MUSCLE |
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Branches of maxillary artery
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Middle Meningeal - Supplies dura roof cranial cavity
-branch before first part becomes second Inferior Alveolar Artery Deep Temporal Arteries (2) Buccal Artery |
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What muscle divides the maxillary artery into 3 parts?
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Lateral pterygoid muscle
1st part: lateral of lateral pterygoid muscle 2nd part: superficial or deep of pterygoid muscle 3rd part: medial of lateral pterygoid muscle |
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V3 enters IT fossa via ____-:
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Foramen Ovale
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Lingual Nerve
Course? Function? |
V3
Course: Runs parallel and anterior to inferior alveolar nerve -enters mouth next to ramus of mandible -passes forward under mucousa below third molar tooth Fxn: somatic SENSORY from anterior 2/3 tongue, floor of mouth, lower gingiva (The FaMiLy Guy) |
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Inferior Alveolar Nerve
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-Big branch
Course: RUns parallel and posterior to lingual nerve -enters mandibular foramen -sends branches to lower teeth -Branch exits mental foramen as mental nerve -Runs with inferior alveolar artery as well -Gives a branch of myelohyoid nerve Fxn: somatic SENSORY to from lower teeth, chin, lower lip |
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Buccal Nerve
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Course: Emerges through lateral pterygoid muscle, heads superficially to cheek
Fxn: SENSORY from cheek, lower gingiva |
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Auriculotemporal Nerve
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Course: Related to the MIDDLE MENINGEAL ARTERY (ENCIRCLES it)
Fxn: SENSORY from auricle and TM joint |
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Motor Branches of V3
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Motor to masticatory muscles - temporalis, masseter, pterygoids
Motor to Tensor Veli Palatini and Tensor Tympani Motor to Mylohyoid and Anterior Belly Digastric muscles (what nerve? mylohyoid nerve) |
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Chorda Tympani Nerve comes from what? How does it course? What are its fxn?
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Facial nerve
Course: After leaving VII in the facial canal, the chorda tympani nerve passes through the middle ear cavity and then enters the IT fossa. Within the IT fossa, IT JOINS THE LINGUAL NERVE and travels to the tongue Fxn: Taste sensation from anterior 2/3 tongue Also transmits parasympathetic fibers from VII to submandibular ganglia |
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The TM joint is a _____ formed by the articulation of the ____ with the _____ and the _____. The TM joing is comprised of a __ ___ ___ that divides the joint cavity into upper and lower compartments
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synovial joint
head of the mandible mandiular fossa articular tubercle fibrocartilaginous articular disc |
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TM Joint:
Laterally, the fibrous capsule of the joint is thickened as ______ Two other ligaments strengthen the joint: ____ & _____ |
temporaomandibular (lateral) ligament
stylomandibular ligament sphenomandibular ligament |
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Movements of TM Joint
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1. Hinge-like rotation
2. Forward gliding |
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Dislocations of TM Joint
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occurs when mandibular head passes anterior to articular tubercle
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Pain is due to sensory innervation of the TM joint by ____
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auriculotemporal nerve
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Masticatory muscles
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Temopralis
Masseter Lateral Pterygoid Medial Pterygoid |
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Temporalis
Attachments, actions |
Attach: Temporal fossa & coronoid process
Act: Elevates mandible. some retraction Innervated by V3 |
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Lateral Pterygoid
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Attach: Lateral pterygoid plate, neck of mandible
Act: Protusion, side-to-side movements |
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Medial Pterygoid
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Attachments: Lateral pterygoid plate and mandible angle
Actions: Elevates mandible, helps protrude, side-to-side movements |
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Masseter
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Attachments: Zygomatic arch & Ramus of mandible
Actions: Elevates mandible. Some retraction (deep fibers) |
