(E2) 2 - Temporomandibular Joint

Question 1

What is the TMJ an articulation between?

Answer 1

• mandibular condyle and articular eminence & glenoid fossa of the temporal bone

Question 2

Describe the temporal bone. (location and contents)

Answer 2

Question 3

What 4 parts make up the temporal bone?

Answer 3

• squamous
• petrous
• tympanic
• mastoid

Question 4

What is contained in the squamous part of the temporal bone?

Answer 4

Question 5

Name the labeled colors (yellow, blue, red, green)

Answer 5

Question 6

What is the articular eminence?

Answer 6

Question 7

Describe the slope and steepness of the articular eminence.

Answer 7

Question 8

What is location and function of the preglenoid plane?

Answer 8

Question 9

______ = Indistinct anterior boundary. Gradually rises from infratemporal surface

Answer 9

Preglenoid Plane

Question 10

_______ - also called mandibular fossa. Superiormost posrtion of fossa is dome (has non-articular portion - posterior & inferior)

Answer 10

Glenoid Fossa

Question 11

Glenoid Fossa - Describe the anterior portion

Answer 11

• Articular
• Lies within the squamous part of the temporal bone

Question 12

Glenoid Fossa - Describe the posterior portion

Answer 12

• Non-Articular
• lies within the tympanic part of the temporal bone

Question 13

Describe the Glenoid Fossa. (shape)

Answer 13

Question 14

What is the articular tubercle? (location, attachment site for)

Answer 14

Question 15

What is the postglenoid tubercle?

Answer 15

Question 16

What is the tympanosquamosal fissure?

Answer 16

• creates small separation between articulating and non articulating areas

Question 17

What is the tegmen tympani?

Answer 17

Question 18

______ forms the roof of the tympanic cavity (middle ear) and bony auditory tube

Answer 18

Tegmen Tympani

Question 19

Describe the Mandibular condyle head

Answer 19

Question 20

___ is the inferior constriction found under the mandible head

Answer 20

Mandibular neck

Question 21

What two parts of the mandible make up the mandibular condyle?

Answer 21

Mandibular condyle head and mandibular neck

Question 22

The mandibular condyle is wider _____ than long _______

Answer 22

• mediolateral
• anteroposterior

Question 23

The mandibular condyle is oriented _____ to ramus

Answer 23

perpendicular

Question 24

Are condyles parallel to each other?

Answer 24

NO

Question 25

______ and _____ of condylar head extend wider than ramus

Answer 25

- medial pole - lateral pole

Question 26

Articular disc attaches to _______

Answer 26

both poles (medial and lateral)

Question 27

The Temporomandibular ligament attaches to______ pole

Answer 27

lateral

Question 28

______ Encompasses joint to retain synovial fluid. Well innervated

Answer 28

Articular capsule

Question 29

What is ankylosis?

Answer 29

Stiffness or fixation of a joint

Question 30

Temporomandibular (lateral) ligament attachment

Answer 30

Attaches to articular tubercle and neck of condyle

Question 31

Describe the Temporomandibular (lateral) ligament

Answer 31

Question 32

Temporomandibular (lateral) ligament: Small bundle of horizontal and oblique fibers limits _____ and _____ displacement

Answer 32

-posterior - inferior

Question 33

Temporomandibular (lateral) ligament: Oblique portion limits ___________

Answer 33

extent of mouth opening

Question 34

Temporomandibular (lateral) ligament: Full opening requires _____ displacement onto articular eminence

Answer 34

anterior

Question 35

What is the remnant of Meckel's cartilage?

Answer 35

Sphenomandibular ligament

Question 36

Describe the Sphenomandibular Ligament (location and action)

Answer 36

Question 37

_____ nerve and ____ artery course between the sphenomandibular ligament and TMJ capsule

Answer 37

- auriculotemporal nerve - maxillary artery

Question 38

_____ (nerve) splits adjacent to the lingular attachment of the sphendomandibular ligament

Answer 38

Nerve to Mylohyoid

Question 39

Describe the stylomandibular ligament (location and movement)

Answer 39

Question 40

Dense fibrous connective tissue that partitions TMJ into two spaces - What is it?

Answer 40

Articular Disc

Question 41

Describe the articular disc

Answer 41

Question 42

Compare and Contrast the Central and Peripheral part of the articular disc

Answer 42

Question 43

The articular disc has 2 thickenings called the ___________ separated by an _________

Answer 43

- anterior and posterior bands - intermediate zone

Question 44

Articular Disc: Which band is the thickest and where is it located?

Answer 44

Question 45

Articular Disc: Attaches to the ________

Answer 45

Articular capsule 360 degrees

Question 46

Articular Disc: Creates a _____ and ______ cavity each lined with _________

Answer 46

- superior and inferior - synovial membrane

Question 47

Articular Disc: Superior Vs Inferior cavity. Which is large?

Answer 47

Superior is slightly larger

Question 48

What are the 2 collateral (discal) ligaments that attach the articular disc to the poles of the condyle?

Answer 48

- Medial discal ligament - Lateral discal ligament

Question 49

Describe the medial and lateral discal ligaments.

Answer 49

Question 50

What is the Superior Retrodiscal lamina?

Answer 50

Question 51

What is the Inferior Retrodiscal lamina?

Answer 51

Question 52

_________ Nerve that innervates muscles of mastication also innervates TMJ

Answer 52

Mandibular Nerve

Question 53

3 Branches off of the Mandibular nerve (there are more but these we need to know)

Answer 53

Question 54

Venous blood returns through _________ and _________ that unite to form the retromandibular vein

Answer 54

- superficial temporal - maxillary veins

Question 55

What are the first main branches off of the maxillary supplying the TMJ?

Answer 55

- deep auricular - anterior tympanic (superficial temporal branches also supply part of the joint area)