Muscles of Mastication Flashcards
What are the 5 muscles of mastication?
masseter, temporalis, medial pterygoid, later pterygoid, sphenomandibularis
Who is the king?
Masseter
What is the flat quadrangular muscle that overlies the lateral surface of the mandibular ramus?
masseter
What is a large, fan shaped muscle at the sides of the head?
temporalis
What muscle’s anterior fibers elevate the mandible, while the posterior fibers retract the mandible?
temporalis
What muscle is thick and triangular with 2 leads, that occupies primarily a horizontal position?
lateral pterygoid
What muscle is almost a mirror-like image of the masseter?
medial pterygoid muscle
What muscle is rhomboidal and runs practically in the same direction on the inner surface of the mandible?
medial pterygoid muscle
Sphenomandibularis was thought to be apart of what muscle?
medial pterygoid muscle
What is the joint which connects the mandible to the skull and regulates mandibular movement?
Temporomandibular joint (TMJ)
What is an articulation between two bones?
A joint
What is a bicondyla joint in which the condyles, located at the two ends of the mandible, function at the same time?
TMJ
The hinging movement is caused by what joint?
ginglymoid joint
What causes the gliding movements?
arthrodial joint
What is the complex diarthrodial sliding-ginglymoid synovial joint, which attaches the mandible to the petrous part of the temporal bone of the cranium?
TMJ
What prevents the TMJ from creating direct articulation?
articulator disc
What is the depression in the temporal bone that accomodates the mandibular condyle?
mandibular condyle fossa
What 3 ligaments support the TMJ?
collateral ligaments, capsular ligament, TM ligament
What are the TMJ’s 2 accessory ligaments?
sphenomandibular ligament, stylomandibular ligament
What attaches the medial and lateral borders of the articular disc to the poles of the condyles?
collateral ligaments
What ligaments are responsible for dividing the joint mediolaterally into the superior and inferior joint cavities?
collateral ligaments
What ligament surrounds and encompasses the TMJ?
capsular ligament
What ligament reinforces the capsular ligament?
TM ligament
What are the two parts of the TM ligament?
outer oblique portion and inner horizontal portion
What are the 2 purposes of synovial fluid?
medium for providing metabolic requirements to the non vascular articular surface of the joint, lubricant between the articular surfaces during function
What provides most the TMJ’s innervation?
auriculotemporal nerve
