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Identify the boundaries of the infratemporal fossa.

Parietal. Frontal. Temporal. Sphenoid. Z. Maxilla. Lat. Pterygoid Plate. Pterygomaxillary Fissure. Infratemporal Fossa. Identify the boundaries of the infratemporal fossa. Temporal Fossa. Boundaries: Lateral=Ramus of Mandible Anterior=Maxilla Medial=Lat. Pterygoid Plate

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Identify the boundaries of the infratemporal fossa.

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  1. Parietal Frontal Temporal Sphenoid Z Maxilla Lat. Pterygoid Plate Pterygomaxillary Fissure Infratemporal Fossa Identify the boundaries of the infratemporal fossa. Temporal Fossa Boundaries: Lateral=Ramus of Mandible Anterior=Maxilla Medial=Lat. Pterygoid Plate Roof=Sphenoid

  2. Temporalis Lateral Pterygoid Masseter Articular disc Buccinator* Medial Pterygoid Temporomandibular eminence Identify the muscles of mastication, their sources of innervation and their major actions in chewing. * Innervated by Facial Nerve • During jaw opening the mandibular condyle and articular disc glide anteriorly onto the temporomandibular eminence. • This is brought about by the action of the superior head of the lateral pterygoid muscle • The temporalis, masseter, medial pterygoid and the inferior head of the lateral pterygoid all participate in jaw closing. • Side-to-side grinding is produced by cooperative actions of one masseter and the contralateral medial pterygoid.

  3. Follow the course of the major nerves supplying structures and passing through the infratemporal fossa. Lesser petrosal n. Auriculotemporal n. Otic ganglion. Facial n.. Chorda tympani Inferior alveolar n. Lingual n. Submandibular ganglion. Identify the parotid, submandibular and sublingual salivary glands. Trace the course of their innervation and follow the flow of saliva from each gland to the mouth.

  4. Innervation of the Lacrimal Gland N. of pterygoid canal Greater petrosal V2 V1 V2 Facial Deep petrosal V3 Pterygopalatine gang. Sup. Cervical gang. Internal carotid a.

  5. Ant. Deep Temporal Post. Deep Temporal Ant. Deep Temporal Post. Deep Temporal Sphenopalatine Infra-orbital V3 Septal brr. Maxillary Middle Meningeal Ext. Cartotid Descending palatine Greater palatine Ext. Cartotid Lesser palatine Inf. Alveolar Post. Sup. Alveolar Trace the flow of blood through the maxillary artery and its major branches. Trace the flow of blood into the nasal and oral cavities.

  6. Trace the flow of air into each of the paranasal sinuses, note the communication with the nasal cavity the relationships of each sinus to the oral, orbital and cranial cavities. Frontal sinus Spheno-ethmoid recess Sup. meatus Sup. Concha Sphenoidal sinus Ethmoid bulla of Middle meatus Middle Concha Inf. Concha Opening to Maxillary Sinus Inf. meatus Sup. Concha

  7. V3 VII IX Pharyngeal plexus XII Identify the extrinsic and intrinsic muscles of the tongue, their innervation, and actions. Identify the muscles of the soft palate, their innervation and major actions. Palatoglossus Palatopharyngeus Hard Palate Styloglossus Stylopharyngeus Stylohyoid Mandible (cut) Levator veli palatini Tensor veli palatini Genioglossus Geniohyoid Hyoglossus Mylohyoid (cut) Sup. Constrictor Hyoid Bone Palatoglossus Palatopharyngeus

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