Lecture 17 Flashcards
What is the function of the buccinator during mastication?
pull back the angle of the mouth and to flatten the cheek area. helps hold food in mouth and assists the muscles of mastication.
What are the articulations of the TMJ joint?
- between head of mandible and mandibular fossa of temporal bone
- does anterior gliding and hinge like rotation
What are the three ligaments associated with the TMJ?
- temporomandibular ligament
- stylomandibular ligament
- spehnomandibular ligament
Muscles that operate the TMJ
masseter
temporalis
medial pterygoid
lateral pterygoid
masseter origin
inferior margin and deep surface of zygomatic bone
masseter insertion
lateral surface of mandibular ramus and coronoid process
masseter action
elevates and protracts the mandible
masseter innervation
mandibular branch of CN V
temporalis origin
floor of temporal fossa and temporal fascia
temporalis insertion
coronoid process and anterior border of mandibular ramus
temporalis action
elevates and retracts the mandible
temporalis innervation
mandibular branch of CN V
lateral pterygoid origin
lateral pterygoid plate and greater wing of sphenoid
lateral pterygoid insertion
front of neck of mandible, articular disc and TMJ
lateral pterygoid action
protracts mandible, depresses chin (bilateral) and grinding (unilateral)
lateral pterygoid innervation
mandibular branch of CN V
medial pterygoid origin
lateral pterygoid plate and maxilla
medial pterygoid insertion
medial surface of mandible near angle
medial pterygoid action
protracts, elevates, and grinding
medial pterygoid innervation
mandibular branch of CN V
anterior boundary of infra temporal fossa
maxilla
superior boundary of infra temporal fossa
greater wing of sphenoid
medial boundary infra temporal fossa
lateral pterygoid plate
lateral boundary of infra temporal fossa
coronoid process and ramus of mandible
inferior boundary of infra temporal fossa
continuous with neck
posterior boundary of infra temporal fossa
TMJ and styloid process
Contents of infra temporal fossa
Mandibular nerve Maxillary artery Medial and lateral pterygoid muscles Lower part of temporalis muscle Chorda tympani nerve Otic ganglion
What are the branches of the first part of the maxillary artery?
deep auricular anterior tympanic middle meningeal accessory meningeal inferior alveolar
What are the branches of the second part of the maxillary artery?
buccal artery
What are the branches of the third part of the maxillary artery?
posterior superior alveolar infraorbital descending palatine artery to pterygoid canal pharyngeal artery sphenopalatine artery
