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Unformatted text preview: 1 Chapter 7 - Pages 914 to 927 Temporal, Infratemporal Regions and Temporomandibular Joint Temporal region 1. region of the head that includes the lateral area of the scalp 2. the deeper soft tissues overlying the temporal fossa of the cranium 3. lies superior to the zygomatic arch Temporal fossa is occupied primarily by the upper portion of the temporalis muscle Boundaries of the temporal fossa Posteriorly and superiorly by the temporal lines Anteriorly by the frontal and zygomatic bones Laterally by the zygomatic arch Inferiorly by the infratemporal crest Floor is formed by parts of the four bones that form the pterion 1. frontal 2. parietal 3. temporal 4. greater wing of sphenoid Contents of the temporal fossa 1. temporal fascia 2. upper part of temporalis muscle 3. deep temporal nerves 4. deep temporal vessels Temporal fascia 1. is a tough fascia covers the temporalis muscle 2. superiorly attaches to the superior temporal lines 3. inferiorly it splits into two layers, attach to the lateral and medial surfaces of zygomatic arch Infratemporal fossa 1. is an irregularly shaped space deep and inferior to the zygomatic arch 2. deep to the ramus of mandible and posterior to maxilla 3. it communicates with the temporal fossa through the interval between and deep to the zygomatic arch Boundaries of the infratemporal fossa Laterally by the ramus of mandible Medially by the lateral pterygoid plate Anteriorly by the posterior aspect of the maxilla Posteriorly by the tympanic plate, mastoid and styloid process of the temporal bone 2 Superiorly by the infratemporal surface of greater wing of the sphenoid Inferiorly where the medial pterygoid muscle attaches to the angle of mandible Contents of infratemporal fossa 1. inferior part of temporalis muscle 2. lateral pterygoid muscle 3. medial pterygoid muscle 4. maxillary artery and its branches ( one of the terminal branches of external carotid artery ) 5. pterygoid venous plexus 6. mandibular nerve and its branches inferior alveolar nerve, lingual nerve, buccal nerve 10. chorda tympani nerve ( branch of facial nerve ) 11. otic ganglion ( one of the parasympathetic ganglia ) Four muscles of mastication Temporalis is a triangular muscle Origin 1. Foor of temporal fossa 2. deep surface of temporal fascia Insertion 1. tip and medial surface of coronoid process of mandible 2. anterior border of ramus of mandible Nerve supply by deep temporal nerves ( branches of anterior division of mandibular nerve ) Actions 1. elevates mandible and closing jaws 2. posterior, more horizontal ¡bers are the primary retractors of mandible Masseter is a quadrate muscle Origin 1. from the inferior border and medial surface of the zygomatic arch 2. medial surface of maxillary process of zygomatic bone Insetion 1. into the angle 2. lateral surface of ramus of mandible Nerve supply by the masseteric nerve ( branch of anterior division of mandibular nerve ) Actions 1. elevates mandible, thus closing jaws 2. super¡cial ¡bers make limited contribution to protrusion of mandible...
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This note was uploaded on 11/22/2011 for the course ANAT 2626 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.
- Winter '11