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Oral Biology > QUIZ 4 TMJ > Flashcards

QUIZ 4 TMJ Flashcards

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1
Q

do fibrous joints permit a lot of movement?

A

no, they generally permit very little movement

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2
Q

what are exmples of fibrous joints?

A
  • sutures in the skull
  • tooth socket - gomphosis
  • syndesmosis - immovable connective tissue holding bones together (ex. the tibia and fibula)
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3
Q

do cartilagenous joints permit a lot of movement?

A

no, they generally permit very little movement (like fibrous joints)

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4
Q

what are examples of cartilagenous joints?

A
  • primary cartilagenous joints
  • secondary cartilagenous joints
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5
Q

what are primary cartilagenous joints?

A
  • synchondroses
  • bone and cartilage in direct apposition
  • ex. sternocostal junction
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6
Q

what are secondary cartilagenous joints?

A
  • symphyses
  • fibrous tissue internally in the joint
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7
Q

___ joints consist of a capsule filled with fluid contained in a membrane

A
  • synovial
  • *synovial fluid in a synovial membrane
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8
Q

movement of bones relative to one another, facilitated by muscle, take place in ___ capsules in ___ joints

A
  • articular capsule (fibrous capsule + synovial membrane)
  • synovial
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9
Q

how are types of synovial joints classified?

A

based on how many axes they can move along and also by the shapes of their articular surfaces

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10
Q

the TMJ is a ___ joint

A

synovial sliding-ginglymoid

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11
Q

the TMJ articulation is composed of the ___ of the mandible and the ___ of the skull, which is indented on the underside of the ___ bone

A
  • condyle
  • glenoid fossa
  • temporal
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12
Q

what types of movements does the TMJ need to produce?

A

protrusive, extrusive, and retrusive movements

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13
Q

the ___ provides a track that the condyle slides along. theis is bounded anteriorly by the ___, which the condyle moves in front of when the jaw opens

A
  • glenoid fossa
  • articular eminence
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14
Q

the condyle is able to ___ and ___ in various ways

A

rotate and translate

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15
Q

is the articular disk a distinct structure?

A

no, it is an extension of the synovial capsule

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16
Q

the synovial cavity is divided into two compartments. describe this.

A
  • the compartments are divided by the articular disk
  • upper joint cavity - adjacent to the glenoid fossa
  • lower joint cavity - adjacent to the condyle
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17
Q

the articular disk runs between and attaches the ___ and ___, enveloping the joint

A

condyle and glenoid fossa

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18
Q

the mandible is formed by ___ ossification

A

intramembranous ossification

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19
Q

the mandible is associated with ___ cartilage

A

meckel’s

20
Q

meckel’s cartilage forms the ___ directly and articulates with the ___. this forms a primitive, or primary joint, before the deveopment of the ___ and ___.

A
  • malleous
  • incus
  • condyle
  • tempral bone
21
Q

the articulation between the temporal bone and the condyle forms the ___

A

TMJ - this is the secondary joint

22
Q

the articular surfaces of the TMJ are covered with a ___, as opposed to ___

A
  • fibrous connective tissue
  • hyaline cartilage
23
Q

what is the fibrous covering of the condyle called?

A

lamina splendens

24
Q

what is the lamina splendens?

A
  • fibrous covering of the condyle that is a layer of mostly avascular type I collagen with some fibroblasts scattered around
25
Q

the glenoid fossa is covered by a ___ layer attached directly to the ___, while the articular eminence is overalid by a ___ layer

A
  • thin fibrous
  • temporal bone
  • much thicker fibrous
26
Q

is there cartilage associated with the articular surfaces of the joint proper?

A

no - it is fibrous connective tissue

27
Q

where is cartilage found?

A

deeper into the condyle and the articular eminence

28
Q

the layers of cartilage found deep in the condyle and the articular eminence have a layer of progenitor cells which spawn ___ in a proliferative layer, which in turn secrete ECM containing type ___ collagen around themselves

A
  • chondroblasts
  • II
29
Q

cartilage has what type of collagen?

A

II

30
Q

the joint capsule forms the ___ that the joint is located within

A

dense collagenous sac

31
Q

the joint capsule has thickened regions which branch out to form the ___

A

temporomandibular ligament

32
Q

the temporomandibular ligament is important for restricting ___ and ___ movements when the joint articulates

A

lateral and medial

33
Q

the temporomandibular ligament restricts movement in what 3 planes?

A
  • medial-lateral
  • superior-inferior
  • posteriorly
  • when the joint moves, it is displaced mainly in an anterior direciton due to these limits
34
Q

what are two other ligaments associated with the TMJ that limit the inferior movement of the jiont when the jaw is open?

A
  • sphenomandibular ligament
  • stylomandibular ligament
35
Q

the articular disk is totally continuous with the ___; it is simply an inward branch of it

A

joint capsule

36
Q

the articular disk is a ___ structure and forms a surface for the ___ to slide along when the jaw opens; a ___ networks overlays ___ cells

A
  • dense fibrous
  • head of the condyle
  • collagen fiber
  • fibroblast
37
Q

is the articular disk bound tightly or loosely to the surface of the condyle?

A

tightly - it matches the contour of the condyle surface

38
Q

the articular disk is thicker in which regions? which region is thinner?

A
  • it is thicker posteriorly and anteriorly
  • middle section is thinner
39
Q

when the jaw is closed, the condyle rests on which part of the articular disk?

A

the thinner, middle section

40
Q

the joint capsule is lined by the ___, and contains a number of folds which form ___ projecting into the ___

A
  • synovial membrane
  • villi
  • joint cavity
41
Q

what are the two layers that the synovial membrane consists of?

A

subintima and intima

42
Q

describe the subintima

A
  • layer of the synovial membrane that consists of loose connective tissue containing elastin fibers and supporting vasculature
  • contains macrophages, adipocytes, fibroblasts, mast cells, and possibly others
  • it is more or less continuous with the fibrous tissue of the capsule
43
Q

describe the intima

A
  • innermost layer of the synovial membrane
  • contains several layers of synovial cells, which can be either A cells (resemble macrophages) or B cells (like fibroblasts but contribute proteins found in the synovial fluid)
44
Q

describe the synovial fluid

A

basically blood plasma containing extra proteins and proteoglycans

45
Q

what are the 4 muscles of mastication?

A

masseter, medial pterygoid, lateral pterygoid, and temporalis

Oral Biology (19 decks)

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