Temporomandibular joint Flashcards
Temporomandibular joint aka———-. And why?
ginglymoarthroidal joint
since it is both a ginglymus (hinging joint) and an arthrodial (sliding) joint)
TMJ is a ———- type of joint of the ——- variety
an atypical synovial joint of the condylar variety
TMJ is a a joint between——— and———
temporal bone
mandible
articular surfaces of TMJ are covered by ———- and not by ———
fibrocartilage
hyaline cartilage
TMJ allows the movements of the mandible for——- and———.
speech
mastication
2 TMJ= 1——- articulation/joint.
craniomandibular
TMJ develops in——- week of intrauterine life
12th
Components of the upper articular surface of TMJ
Articular fossa, tympanic plate,articular tubercle/eminence
Components of the lower articular surface of TMJ
head of the mandible
Shape of condylar head of mandible
surface is elliptical in shape
Shape of the upper and lower articular surfaces in terms of concavity and convexity
Upper-concavo convex
Lower-concave
JOINT CAVITY Of TMJ is divided into——- and ——- compartments by an———- of fibrocartilage.
upper menisco-temporal
lower menisco-mandibular
intra-articular disc
Upper and lower section of the joint cavity of TMJ permits which mechanism of motion?
Upper: gliding
Lower: gliding and rotation
Articular Disc of TMJ is an oval plate of ——-(mainly——-, few—-)
fibrocartilage
collagen
cartilage
periphery of the articular disc of TMJ is attached firmly to the——-
fibrous capsule.
Articular disc of TMJ appears to possess a thin ——— zone and thickened———- and—— bands
intermediate
anterior
posterior
anterior band of articular disc of TMJ becomes continuous with the———-
tendon of lateral pyerygoid muscle
The posterior band splits into two laminae . What are they?…are they elastic?…and what do they attach to?
the upper elastic posterior band attaches to squamotympanic fissure(fissure in the temporal bone that runs from the temporomandibular joint to the tympanic cavity)
-lower non elastic posterior band attaches to the back of the condyle
The bilaminar region of the articular disc of TMJ contains a——-
venous plexus
INTERMEDIATE central part of the articular disc of TMJ is——-
avascular
Function of the elastic fibres in the posterior part of the disc?
elastic fibres in the posterior part of the disc bring back the disc in the articular fossa when the open mouth is closed.
Anterior relations of the TMJ
mandibular notch,mesenteric nerve and artery
Mandibular notch is also called ——-?
sigmoid notch
Posterior relations of the TMJ
tympanic plate,glenoid process of parotid gland
Lateral relations of the TMJ
parotid gland,skin
Medial relations of the TMJ
maxillary artery and vein
List the ligaments of the TMJ.
Stating which are true and which are accessory
fibrous capsule(true),temporomandibular(true),sphenomandibular(accessory),and stylomandibular(accessory) ligaments.
FIBROUS CAPSULE ligament is attached to :?
articular tubercle, squamotympanic fissure,circumference of articular fossa and neck of mandible
FIBROUS CAPSULE is loose ——-and tight——
above the articular disc
below it.