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23 Cards in this Set
- Front
- Back
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Pterion boundaries, contents, and injury |
Junction = frontal, temporal, parietal, and sphenoid bone 4 cm above midpoint of zygomatic arch (malar bone) Greater wing of sphenoid meets anterioinferior angle of parietal bone Contents = anterior branch of Middle meningeal artery Injury = epidural hematoma |
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4 muscles of mastication |
All innervated by V3 of trigeminal nerve 1) Masseter = elevates mandible 2) Temporalis = elevates and retracts mandible 3) Medial Pterygoid = Protracts and elevates mandible 4) Lateral Pterygoid = protracts and depresses mandible Medial + Lateral = grinding motion |
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Nerves of Temporal region |
Lesser Petrosal (IX) = PS fibers to parasympathetic gland for salivation (involved in Frey's Syndrome) Mandibular Division of Trigeminal nerve (V3) = sensory (GVA) and motor (SVE) |
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Mnemonic for branches of Maxillary artery |
Mayo Doesn't Make It Better Middle Meningeal Artery Deep Temporal arteries (ant. and post.) Masseteric artery Inferior Alveolar artery Buccal artery |
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Temporomandibular joint and ligaments |
Hinge and sliding joint; only synovial joint in head Slight opening = Hinge only Jaw opens wide = hinge + sliding Ligaments (3) Stylomandibular Sphenomandibular Lateral Temporalmandibular |
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Temporal Fossa Contents |
Temporalis muscle Deep temporal and Middle Meningeal Artery Auriculotemporal nerve (V3) Zygomaticotemporal nerve (V2) |
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Temporomandibular ligament |
Reinforces TMJ on the lateral surface Covered by parotid gland Prevents excess movement in the post. direction = protects the external auditory meatus |
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Sphenomandibular ligament |
Flat, thin band from spine of sphenoid to lingula of mandible Medial side of TMJ Derived from 1st pharyngeal arch |
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Stylomandibular ligament |
Styloid process to ramus of the mandible Separates Parotid gland from submandibular gland Thickened band of deep cervical fascia |
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Temporalis OIA |
O = floor of the temporal fossa I = coronoid process and anterior border of the Mandibular ramus (underneat malar bone) A = elevates and retracts the ramus |
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Masseter OIA and what crosses it |
O = Inferior surface of zygomatic arch I = medial surface of mandible near its angle A = elevates the mandible Cross superficially by transverse facial artery, parotid duct, and buccal branch of facial nerve (CNVII) |
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Lateral Pterygoid OIA |
O: Upper head = infratemporal surface of greater wing of sphenoid; Lower head = lateral surface of lateral pterygoid plate I = neck of the mandible and articular disc A = protracts and depresses the mandible Also: deviates mandible to contralateral side when working w/ medial pterygoid = grinding |
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Medial Pterygoid OIA |
O: superficial head = tuberosity of the maxilla; Deep head = medial surface of lateral pterygoid plate I = medial surface of angle of mandible A = protracts and elevates the mandible |
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Maxillary artery |
Larger of the 2 terminal branches of the external carotid usually superficial to the lateral pterygoid muscle |
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3 parts of maxillary artery |
1) Mandibular = deep to or embedding in the parotid gland 2) Pterygoid = to pterygoid, masseter, and buccinator 3) Pterygopalatine to the fossa |
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Pterygoid Venous Plexus |
Lateral to the maxillary artery and lateral pterygoid muscle = superficial Tributaries correspond to the maxillary artery Coalesces to form the maxillary vein which joins superficial temporal vein = Retromandibular vein |
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Branches of Undivided Mandibular Nerve (V3) |
Immediately after exiting foramen ovale Sensory = Meningeal branch to the dura of middle cranial fossa Motor (SVE) N2 medial pterygoid N2 tensor tympani muscle N2 tensor veli palatini |
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SVE's |
Innervate muscles of branchiomeric origin NOT somites (somatic muscles) Branchial arches Mastication muscles come from 1st branchial arch 2nd branchial arch = muscles of facial expression
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Tensor Tympani OIA |
O = Auditory tube and greater wing of sphenoid I = handle of the malleus A = pulls handle of malleus medially and tenses tympanic membrane = reduces amplitude of its oscillations |
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Tensor Veli Palatini OIA |
O = scaphoid fossa of the medial pterygoid plate I = palatine aponeurosis A = elevates the palate during swallowing |
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Anterior Division of Mandibular nerve (V3) |
ANTERIOR = SMALL MOTOR (SAM) Sensory Long Buccal Nerve = supplies skin and mucosa over most of the cheek and gingiva; penetrates buccinator BUT no motor innervation Motor Deep temporal nerves Masseteric nerve Nerve to lateral pterygoid |
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Posterior Division of Mandibular nerve (V3) |
POSTERIOR = LARGE SENSORY (LiPS) Sensory Auriculotemporal nerve Lingual Nerve = ant. 2/3 of tongue Inferior Alveolar nerve = teeth of lower jaw; exits as mental nerve to give sensory to anterior chin Motor Nerve to Mylohyoid and Ant. Belly of Digastric = branch of Inferior Alveolar |
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Nerve that senses taste |
Chorda tympani Branch of the 7th nerve (Facial Nerve) Together w/ lingual = pain, temp, touch, and TASTE to ant. 2/3 of tongue |
