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AS II - Final Exam > TMJ > Flashcards

TMJ Flashcards

1
Q

What type of joint is the TMJ?

A

modified hinge

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2
Q

Label

A

Anteriorly is articular tubercle

posteriorly is post glenoid tubercle

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3
Q

label

A

anteriorly is articular aminence

middle is articular tubercle

posteriorly is post glenoid tubercle

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4
Q

Borders of mandibular fossa

A

Lateral: zygomatic process of temporal bone

Medial: spine of sphenoid bone

Anterior: articular eminence

Posterior: squamotympanic and petrotypanic fissures

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5
Q

what passes through petrotympanic fissure?

A

chorda tympani

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6
Q

What’s more medial: squamotympanic fissure or petrotympanic fissure?

A

pertrotympanic fissure is the more medial half

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7
Q

How are the condyles of the mandible formed?

A

intramembranous ossification

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8
Q

What attaches to external oblique line?

A

depressor anguli oris

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9
Q

What is found on each side (laterally) of the mental spine of the interior mandible?

A

digastric fossae

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10
Q

What attaches to the digastric fossae?

A

origin of the anterior belly of the digastric

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11
Q

What attaches to the mental spine?

A

genioglossus muscle attaches to superior aspect of mental spine

geniohyoid attaches to lower aspect

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12
Q

What passes through mandibular canal?

A

inferior alveolar nerve and artery

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13
Q

what passes through mental foramen?

A

cutaneous branches of inferior alveolar nerve and artery

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14
Q

What attaches to the lingula?

A

sphenomandibular ligament

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15
Q

what runs along mylohyoid sulcus/groove and where is it located?

A

runs downward and forward from inferior border of mandibular foramen

nerve to mylohyoid muscle runs along it

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16
Q

What’s the shape of the articualr disc?

A

biconcave

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17
Q

Where are superior and inferior lamellae found?

A

inner periphery of articulator capsule

18
Q

primary composition of superior and inferior lamellae

A

Superior is ELASTIC

inferior is COLLAGEN

19
Q

two regions of joint capsule of TMJ

A

capsular ligament and lateral/temporomandibular ligament

20
Q

what does the capsular ligament prevent?

A

excessive lateral movement and posterior dislocation

21
Q

what does lateral/temporomandibular ligament prevent?

A

excessive lateral movement and posterior dislocation

22
Q

attachments of stylomandibular ligament

A

styloid process to angle of mandible

23
Q

function of stylomandibular ligament

A

limits protrusion

24
Q

sphenomandibular attachments

A

from spine of sphenoid to lingula of mandible

25
Q

function of sphenomandibular ligament

A

supports weight of mandible

prevents excessive lateral movement of mandible

26
Q

fulcrum of elevation and depression of the mandible

A

approx. at mandiblar foramen

27
Q

Locations of hinge movement and gliding at TMJ

A

hinge at lower joint compartment

gliding/translation at upper joint compartment

28
Q

attachments of temporalis muscle

A

temporal fossa

tip of coronoid process, ramus of mandible

29
Q

action of temporalis muscle

A

elevation, retrusion of mandible (bilaterally)

also holds resting position of mandible

30
Q

innervation of temporalis muscle

A

deep temporal branches

31
Q

attachments of masseter muscle

A

outer and inner surfaces of zygomatic bone and arch

angle and lateral surface of ramus of mandible

32
Q

action of masseter muscle

A

bilateral elevation and protrusion of the mandible

33
Q

innervation of masseter muscle

A

masseteric nerve

34
Q

attachments of lateral pterygoid muscle

A

Sup head: greater wing of sphenoid

Inf head: lateral pterygoid plate

both: capsule, disc, condyle

35
Q

action of lateral pterygoid muscle

A

bilateral mandibular depression (only muscle of mastication that does this), protracts mandible

36
Q

innervation of lateral pterygoid muscle

A

lateral pterygoid nerve

37
Q

attachments of medial pterygoid muscle

A

lateral pterygoid plate, tuberoisity of maxilla

medial ramus of mandible, inferior to mandibular foramen

38
Q

action of medial pterygoid muscle

A

bilateral elevation, protrusion

39
Q

innervation of medial pterygoid muscle

A

medial pterygoid nerve

40
Q

what gives sensory information to TMJ?

A

auriculotemporal nerve (also small anterior portion by masseteric branches of V3)

pain from posterior and posterolateral regions of capsule

retrodiscal inferior lamella contains proprioceptive mechanoreceptors for condyle movement

41
Q

what gives blood supply to TMJ?

A

articular branches from superficial temporal artery

also arterial twigs from muscular branches of maxillary artery for anterior aspect

AS II - Final Exam (3 decks)

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