Deep Face 2 Flashcards
The muscles of mastication originate from?
First branchial arch
The muscles of mastication are innervated by?
Mandibular division of Trigeminal nerve, V3
During grinding and chewing (lateral displacement) which muscles move ipsilateral and which ones move contralateral?
Ipsilateral: Masseter and Temporalis mm.
Contralateral: Medial and Lateral pterygoid mm.
T or F:
The muscles of mastication act all at once?
False: they act in a series.
T or F:
Grinding teeth (bruxism) can cause TMJ dysfunction?
True
Which muscle of mastication is the most acting muscle in protraction? Which muscle assists?
Lateral Pterygoid; Medial Pterygoid
Which muscle of mastication is the most acting muscle in retraction?
Posterior fibers of Temporalis and Deep fibers of Masseter
Which muscle of mastication is the most acting muscle in elevation?
Temporalis, Masseter and Medial Pterygoid
Which muscle of mastication is the most acting muscle in Depression?
Lateral pterygoid, Digastric (anterior belly), Mylohyoid, Geniohyod, infrahyoid and GRAVITY!!
What bony landmarks make up TMJ?
Mandible Zygomatic bone Maxilla Sphenoid bone Temporal bone (squamous and tympanic parts) Frontal bone
Which fossa receives the head of the MANDIBLE to create TMJ?
Mandibular
TMJ Articular disc is made of?
Biconcave made of Fibrocartilage
Which muscles inserts at the TMJ Articular disc?
Lateral Pterygoid m (superior head)
The TMJ Dis divides the joint into?
Suprameniscal and Inframeniscal compartments
What movements are associated with TMJ?
Elevation/Depression (inframeniscal compartment)
Protrusion/Retraction (suprameniscal compartment)
The ____ ____ of the joint capsule encloses the temporomandibular joint complex, and is attached to the articular disc.
fibrous membrane
The ligaments of the TMJ function to help ____ the movement of the joint, but they __ __ ____ it or prevent excessive movement due to force.
limit; DO NOT STABALIZE
Name the ligaments of TMJ
Tempromandibular (lateral ligament)
Stylomandibular
Sphenomandibular
