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Gross Anatomy > TMJ > Flashcards

TMJ Flashcards

1
Q

what type of joint is TMJ?

A

Hinge joint

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2
Q

three components of TMJ

A

articular eminence and tubercles or temporal bone, mandibular fossa of temporal bone, condyle of mandible.

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3
Q

what passes through the petrotympanic fissure?

A

chorda tympani

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4
Q

what separates the mandibular fossa of the squamous portion of the temporal bone from the tympanic plate of the temporal bone

A

squamotympanic fissure

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5
Q

medial half of the squamotympanic fissure becomes what?

A

petrotympanic fissure

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6
Q

articular surface of condyle covered by what?

A

dense fibrous tissue with isolated groups of chondrocytes

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7
Q

what kind of bone formation used to form condyle/mandibular bones?

A

intramembranous ossification

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8
Q

what attaches at the external oblique line?

A

depressor anguli oris

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9
Q

What muscle is attached to the upper aspect of the mental spine?

A

genioglossus

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10
Q

What muscle attaches to the lower aspect of mental spine?

A

geniohyoid

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11
Q

mandibular canal carries what?

A

alveolar nerve and artery

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12
Q

What is the tonguelike projection of bone guardiang the superoanterior border of mandibular foramen?

A

lingula

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13
Q

What muscle attaches to the Lingula?

A

sphenomandibular ligament

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14
Q

internal oblique line divides into what two regions?

A

retromolar triangle and retromolar fossa

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15
Q

disc is attached to the
inner periphery of the articular
capsule by what?

A

superior and inferior sheets or lamellae

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16
Q

Lamellae blend with what?

A

capsular ligament

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17
Q

superior lamella is mostly what?

A

elastic

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18
Q

inferior lamella is mostly what?

A

collagen

19
Q

what are the two intrinsic ligaments of the TMJ, and what do they do?

A

capsular and lateral ligament or tmj ligament. prevent excessive lateral movement and posterior dislocation.

20
Q

what are the 2 extrinsic ligaments?

A

stylomandibular and sphenomandibular.

21
Q

stylomandibular attaches where and limits what?

A

styloid process to the angle of the mandible. limits protrusion

22
Q

sphenomandibular

A

spine of sphenoid to the lingula of the mandible. supports weight of the mandible, and prevents excessive lateral movement of mandible.

23
Q

movement of the mandible includes what?

A

hinge and gliding movement

24
Q

where does hinge take place?

A

in lower joint compartment

25
Q

where does gliding take place?

A

in upper compartment

26
Q

What is the temporalis muscle innervated by?

A

deep temporal branches

27
Q

attachments of temporalis muscle

A

temporal fossa, tip of coronoid process, ramus of mandible

28
Q

action of temporalis muscle

A

bilateral: elevation, retrusion of mandible. unilateral: ipsilateral deviation. holds resting position of mandible.

29
Q

innervation of masseter muscle

A

masseteric nerve

30
Q

attachments of masseter muscle?

A

outer and inner surfaces of the zygomatic bone and arch, angle and lateral surface of ramus of mandible.

31
Q

action of masseter muscle?

A

bilat: elevation, protrusion of mandible. uni: ipsilateral deviation

32
Q

Innervation of lateral pterygoid muscle

A

lateral pterygoid nerve

33
Q

attachments of lateral pterygoid muscle

A

sup head: greater wing of sphenoid. inf head: lateral pterygoid plate. both: capsulee, disc, condyle

34
Q

action of lateral pterygoid muscle?

A

bilat: depresses, protracts mandible. uni: contralateral deviation

35
Q

innervation of medial pterygoid muscle?

A

medial pterygoid muscle

36
Q

action of medial pterygoid muscle

A

bilat: elevation,protrusion. uni: contralateral deviation

37
Q

attachments of medial pterygoid ?

A

lateral pterygoid plate, tuberosity of maxilla. medial ramus of mandible, inferior to mandibular foramen

38
Q

most of the nerve supply to TMJ supplied by what?

A

sensory articular branches of auriculotemporal nerve

39
Q

small anterior portion of TMJ is supplied by what?

A

masseteric branches of V3

40
Q

what does the posterior regions of joint capsule contain nerve wise?

A

free nerve endings conducting pain impulses

41
Q

retrodiscal inferior lamella contain what ?

A

prprioreceptive mechanoreceptors that detect condylar movement and position.

42
Q

Articular branches arise from the___________________ artery to supply most of the joint.

A

superficial temporal artery

43
Q

there are small arterial twigs from muscular branches of the ________ artery that supply the anterior aspect of the joint.

A

maxillary

Gross Anatomy (11 decks)

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