HUBS1105 Lecture Notes - Lecture 18: Anterior Cranial Fossa, Sphenoidal Sinus, Paranasal Sinuses

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The face surface of front of head. The skull has 8 cranial bones and 14 facial bones. It provides origin for small muscles of mastication and forms part of the middle cranial fossa: ethmoid bone cribriform plate lies in the anterior cranial fossa, conchae and perpendicular plate drops into the nose. Para-nasal sinuses four pairs in bones closely located to the nasal cavity - add quality to voice - frontal sinuses, ethmoidal sinuses, sphenoidal sinuses and maxillary sinuses. These are pneumatic bones which lay in spaces within the bones. Joint is between the condyle of mandible, and the articular tubercle and mandibular fossa of temporal bone: a synovial hinge joint. The mandible: has a coronoid process, condyle, alveolar processes for the teeth, mental protuberance. Closes the jaw: masseter - origin = zygomatic arch; insertion onto angle and ramus of the mandible. Acts to elevate the mandible: pterygoid muscles 2x.

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