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exam 2-TMJ
TMJ
15
Anatomy
Graduate
08/07/2011

Additional Anatomy Flashcards

 


 

Cards

Term

Temporomandibular Joint

 

Definition

Definition

-Articulation between mandible and cranium

 

-Bilateral joint

-right and left joints are connected by mandible, making their movements interdependent 

Term

TMJ

 

Characteristics

Definition

Complexity of motion

-most movements are combinations of 2 types of motion(translation and rotation)

 

-a synovial joint subdivided into 2 compartments y an articular disc.

Term

TMJ

 

Bony Components 

Definition

Temporal Bone

-Mandibular (glenoid) fossa

-Articular tubercle

-Articular eminence

-Postglenoid tubercle (spine)

 

Mandibular condyle 

Term

TMJ

 

Soft tissue components

Definition

-Joint capsule

 

-Synovial membrane

Term

Articular Disc

 

Composition, Major parts, Compartments 

Definition

-Composed of Fibrous tissue changing to fibrocartilage in older adults

 

-Major parts: anterior and posterior bands, intermediate zone

 

-Divides joint into upper and lower compartments

Term

Articular Disc

 

Attachments

Definition

-Medial and lateral poles of condyle

 

-Posterior wall of joint capsule via retrodiscal pad

 

-Anterior wall of joint capsule and superior head of lateral pterygoid muscle 

Term

Bilaminar Zone

 

(Retrodiscal Pad)

Definition

-Inferior lamina: collagenous fibers running down ot attach to posterior condylar neck

 

-Superior lamina: some collagenous fibers interspersed with numerous elastic fibers; attaches to typmanic plate and mandibular fossa

Term

TMJ

 

Ligaments

Definition

-Lateral ligament (temporomandibular ligament)

 

-Sphenomandibular ligament

 

-Stylomandibular ligament

Term

TMJ 

 

Nerve supply

Definition
auriculotemporal n
Term

TMJ

 

blood supply

Definition

-superficial temporal a

 

-branches of maxillary a. around it

Term

TMJ

 

Types of movement

 

Definition

-Translation: (grinding) in superior joint compartment(disc-eminence)

 

-Rotation: (hinge) in inferior joint compartment (disc-condyle) 

 

-movements of the disc during opening and closing 

Term
Mandibular movements
Definition

-result of the combined action of several mm. contracting simultaneously or in a coordinated sequence 

 

-movements

1.Elevation(closing of mouth)

2.Depression(openeing of mouth)

3.Lateral movements(side-to-side)

Term
Muscles that elevate the mandible
Definition

-Temporalis

-Masseter

-Medial pterygoid

 

-Masseter and medial pterygoid form "pterygomassetric sling" under the angle of the mandible

Term
Muscles that depress the mandible
Definition

-Inferior head of the lateral pterygoid

 

-Digastric (pulls downward and backwards on the mandibular symphysis) 

Term
MM. that produce side-to-side movment of mandible
Definition

-MM. acting unilaterally

 

-Contralateral excursion: medial and lateral pterygoid

 

-Ipsilateral movement: masseter and temporalis 

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