Temporomandibular joint Flashcards by Iseoluwa Ojo

Temporomandibular joint aka———-. And why?

ginglymoarthroidal joint

since it is both a ginglymus (hinging joint) and an arthrodial (sliding) joint)

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TMJ is a ———- type of joint of the ——- variety

an atypical synovial joint of the condylar variety

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TMJ is a a joint between——— and———

temporal bone

mandible

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articular surfaces of TMJ are covered by ———- and not by ———

fibrocartilage

hyaline cartilage

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TMJ allows the movements of the mandible for——- and———.

speech

mastication

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2 TMJ= 1——- articulation/joint.

craniomandibular

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TMJ develops in——- week of intrauterine life

12th

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Components of the upper articular surface of TMJ

Articular fossa, tympanic plate,articular tubercle/eminence

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Components of the lower articular surface of TMJ

head of the mandible

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Shape of condylar head of mandible

surface is elliptical in shape

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Shape of the upper and lower articular surfaces in terms of concavity and convexity

Upper-concavo convex

Lower-concave

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JOINT CAVITY Of TMJ is divided into——- and ——- compartments by an———- of fibrocartilage.

upper menisco-temporal

lower menisco-mandibular

intra-articular disc

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Upper and lower section of the joint cavity of TMJ permits which mechanism of motion?

Upper: gliding
Lower: gliding and rotation

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Articular Disc of TMJ is an oval plate of ——-(mainly——-, few—-)

fibrocartilage

collagen

cartilage

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periphery of the articular disc of TMJ is attached firmly to the——-

fibrous capsule.

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Articular disc of TMJ appears to possess a thin ——— zone and thickened———- and—— bands

intermediate

posterior

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anterior band of articular disc of TMJ becomes continuous with the———-

tendon of lateral pyerygoid muscle

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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

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The bilaminar region of the articular disc of TMJ contains a——-

venous plexus

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INTERMEDIATE central part of the articular disc of TMJ is——-

avascular

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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.

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Anterior relations of the TMJ

mandibular notch,mesenteric nerve and artery

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Mandibular notch is also called ——-?

sigmoid notch

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Posterior relations of the TMJ

tympanic plate,glenoid process of parotid gland

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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.

———lines the inner aspect of the capsule and neck of mandible

synovial membrane

Temporomandibular ligament aka——

lateral ligament

Temporomandibular ligament is attached above to——- and attached below to——

articular tubercle on root of zygoma posterolateral aspect of the neck of the mandible

Temporomandibular ligament strengthens the———-

lateral aspect of the capsule

Stylomandibular ligament is attached above to the——-and attached below to the——-

lateral surface of the styloid process angle and adjoining posterior border of the ramus of the mandible

Stylomandibular ligament is formed due to——- and seperates the——-

thickening of the investing layer of deep cervical fascia parotid and mandibular ligament

Which ligaments control range of motion of TMJ and hold it like a swing

Accessory ligaments

Sphenomandibular ligament is attached above to the——And attached below to ——-on the—— surface of the mandible

spine of the sphenoid lingual notch and lower margins of the mandibular foramen medial

Sphenomandibular ligament lies on a closer plane to the joint capsule. T/F

F. lies on a deeper plane away from the joint capsule

Sphenomandibular ligament represents the unossified part of the sheath of———

meckel’s cartilage

Sphenomandibular ligament is an important landmark when administering———

inferior alveolar nerve block

inferior alveolar nerve innervates the——- and gives a branch called the——

lower teeth mylohyoid nerve

Sphenomandibular ligament is pierced Near its lower end by the ——?

mylohyoid nerve and vessels.

Lateral relations of Sphenomandibular ligament? Medial relations of Sphenomandibular ligament?

Lateral: auriculotemporal nerve;lateral pterygoid,maxillary artery,inferior alveolar nerve and vessels Medial: chordi tympani nerve,medial pterygoid , wall of pharynx

List the weird ligaments of the TMJ

- oto mandibular ligament - disco malleolar ligament - mallelo mandibular ligament

Disco malleolar ligament runs from - to -

neck of malleus to capsule of TMJ

Sensory nerve supply of TMJ? | Motor nerve supply of TMJ)

Sensory - auriculotemporal nerve(post branch of mandibular nerve) - masseteric nerve(ant branch of mandibular nerve) Motor Mandibular division of trigeminal nerve

blood supply to TMJ is only——- ;meaning there is no blood supply ——-capsule; the joint takes its nourishment from——-

Superficial inside the the synovial fluid

List the blood supply of the TMJ

maxillary artery - superficial temporal artery - deep auricular artery (maxillary) - anterior tympanic artery (maxillary) - ascending tympanic artery(maxillary)

LYMPHATIC DRAINAGE of TMJ is through ———

upper deep cervical nodes - superficial parotid nodes(preauricular) - deep parotid nodes

The TMJ is much more stable when the——;which is when the mandible rests on——

mouth is closed(occluded teeth) maxilla

when teeth is occluded,the forward movement of condyle is stopped by the —-and by the contraction of ____muscle, while the backward movement of the condyle is prevented by the—— and the contraction of the—- muscle.

articular eminence the posterior fibres of the temporalis lateral ligament lateral pterygoid

——-motion of the TMJ while opening the mouth occurs ———mouth opening then——motion for the rest

rotational first for 20-25mm of gliding

Which is a stronger action?. | Opening or closing the mouth

Closing the mouth is stronger action than the opening the mouth.

List the 5 movements of the TMJ

``` Depression Elevation Protraction Retraction Chewing ```

Gravity helps depression of the TMJ. | T/F

Describe the Depression movement of the TMJ

head of mandible and articular disc glide forward in the upper menisco temporal compartment -the head also rotates forward under the articular disc

——- is the Reverse of depression of TMJ

Elevation

Describe the elevation movement of the TMJ

head of mandible and articular disc glides back in the upper menisco temporal compartment -the head then rotates backwards under the articular disc

Describe the protraction movement of the TMJ

head of mandible and articular disc glide forward in the upper meniscotemporal compartment on both sides

Describe the retraction movement of the TMJ

head of mandible and articular disc glide backward in the upper meniscotemporal compartment

Describe the side to side chewing movements of the TMJ

occur alternately in the right and left TMJs unlike the other movements - head of mandible and articular disc on one side glides forward - while head of mandible of the other side just rotates on its vertical axis

In side to side chewing; the non-gliding head rotates in what axis

Vertical axis

In side to side chewing movement of the TMJ, one side of chin moves forward. What side is that?

The side that didn’t glide

Dislocation of the mandible can only occur in what direction?

dislocated only anteriorly

What Is the most unstable position of the TMJ?

When the mouth is open, the mandibular condyles move forward and lie underneath the articular eminences.

if you over yawn, and in this position there is sudden spasm of the—- muscles, ———may slip—- and get locked in the ——-preventing the mouth from closing .Passively trying to close the mouth would definitely lead to——. So instead, reduction is done by ——

lateral pterygoid the head of the mandible of one or both sides forward infra temporal fossa fracture of one or both necks of mandible depressing the jaw with thumb placed on the last molar teeth, and simultaneously elevating the chin.

symptoms arising from TMJs and their associated masticatory muscles. jaw pain:spasm of—— headache:spasm of—— diffuse facial pain:spasm of—-

lat. pterygoid temporalis masseter

Temporomandibular joint syndrome is also associated with —-in the joint that is audible when the patient is——. Caused due to the ——-of the articular disc becomes—— and the disc is trapped——

clicking and pain chewing posterior attachment too stretched or detached anteriorly

List the principal MUSCLES OF MASTICATION

``` PRINCIPAL temporalis Masseter Medial pterygoid Lateral pterygoid ```

List the accessory MUSCLES OF MASTICATION

``` ACCESSORY Buccinator Digastric Mylohyoid Geniohyoid ```

Match the following receptors to their function to the TMJ. Rufini receptors :—— pacinian receptors :—- golgi tendon organs:—— free nerve endings:—-

position of mandible accelerate movement during reflexes to protect ligaments around TMJ pain receptors

Which muscles control the protraction and retraction of the TMJ

Protraction: medial and lateral pterygoid Retraction: posterior fibers of temporalis ;deeper fibers of masseter; geniohyoid;digastric

Which muscles control the depression and elevation of the TMJ

Depression: lateral pterygoid, digastric, geniohyoid Elevation: medial pterygoid, temporalis, masseter

Protrusion is mainly subserved by the ____ muscke

Lateral pterygoid

Temporomandibular joint Flashcards

(74 cards)