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Identify the boundaries of the infratemporal fossa.

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Presentation on theme: "Identify the boundaries of the infratemporal fossa."— Presentation transcript:

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

2 Identify the muscles of mastication, their sources of innervation and their major actions in chewing. Temporalis Masseter Medial Pterygoid Buccinator* Lateral Pterygoid * Innervated by Facial Nerve Temporomandibular eminence Articular disc 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. 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. Inferior alveolar n. Lingual n. Facial n.. Submandibular ganglion. Otic ganglion. Lesser petrosal n. Chorda tympani Auriculotemporal n.

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

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

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 Middle Concha Ethmoid bulla of Middle meatus Inf. Concha Opening to Maxillary Sinus Inf. meatus Sup. Concha

7 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 V3 IX XII Pharyngeal plexus VII Palatopharyngeus

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