Flashcards in 4.1 Infratemporal Fossa Deck (79)
What is the superior boundary of infratemporal fossa?
Greater wing of sphenoid (inferior surface) and squamous temporal bones
What are the features of the superior boundary of infratemporal fossa?
Foramen ovale, foramen spinosum
What is the inferior boundary of infratemporal fossa?
"Open bottom" filled by medial pterygoid muscle
What is the medial boundary of infratemporal fossa?
Lateral pterygoid plate
What are the features of the medial boundary of infratemporal fossa?
Pterygomaxillary fissure (between medial and anterior walls)
What is the lateral boundary of infratemporal fossa?
Ramus and condyle of mandible
What are the features of the lateral boundary of infratemporal fossa?
Lingula, mandibular foramen and canal
What is the anterior boundary of infratemporal fossa?
What are the features of the anterior boundary of infratemporal fossa?
Posterior superior alveolar foramina
What is the posterior boundary of infratemporal fossa?
The temporal fossa funnels inferiorly to pass below ... and ends at base of skull
What separates the temporal fossa from the infratemporal fossa?
Thickened portion of the joint capsule to prevent posterior and inferior dislocation of the joint.
Lateral ligament of TMJ
Biconcave disc of dense fibrous tissue between condyle and mandibular fossa
Articular disc of the TMJ
What is the relationship of the sphenomandibular ligament with the TMJ?
Medial to TMJ
Primary passive support of the mandible (tonus of muscles of mastication usually bear weight of mandible)
Anatomical variations of the attachment of the Sphenomandibular ligament to the lingula of the mandible can result in poor anesthesia to the ...
inferior alveolar nerve
What is the retrodiscal pad/tissue located between?
articular disc and the posterior osseous structures
What is the movement of the upper compartment of the articular disc of the TMJ?
Translatory movement (gliding) = protrusion and retrusion
What is the movement of the lower compartment of the articular disc of the TMJ?
Hinge movement = elevation and depression
What is the primary nerve and vascular supply of the TMJ?
auriculotemporal n. and superficial temporal a.
What nerve and artery innervate and supply the anterior surface of the TMJ?
n. to masseter and muscular branches of maxillary a.
The muscles of mastication are all innervated by branches of ...
What fibers of the temporalis muscle maintain resting tonus and elevation of mandible?
Bilaterally, anterior fibers
What fibers of the temporalis muscle are primary retractors of mandible?
Bilaterally, posterior fibers
What is superficial to the master muscle? (4)
transverse facial a., parotid duct, parotid gland, branch of facial n.
Which muscles close the mouth (elevation)?
Temporalis, Masseter, Medial pterygoid m.
Which muscles act to open the mouth (depression)?
Gravity, Lateral pterygoid (inferior heads), suprahyoid mm., infrahyoid mm., platysma
Which muscles jut the jaw out (protrude)?
Masseter (superficial fibers), Lateral pterygoid m., Medial pterygoid m.