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S3- Musculoskeletal > TMJ Anatomy/Biomechanics Review > Flashcards

TMJ Anatomy/Biomechanics Review Flashcards

1
Q

ARTICULAR STRUCTURES

A

ARTICULAR STRUCTURES

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2
Q
  • The TMJ is between the mandibular _________ and the mandibular fossa of the ___________ bone.
  • Anteriorly, the disc is attached to what?
  • Posteriorly, the disc is attached to what?
A
  • condyle, temporal
  • anterior capsule and lateral pterygoid
  • retrodiskal laminae
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3
Q

The TMJ capsule is thin _______/________ and thickened ________/________ by collateral ligaments.

A
  • anterior/posterior

- laterally/medially

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4
Q

The TMJ disc is a bi-_______, flexible fibrocartilaginous structure with anterior, posterior, and intermediate bands.

A

-bi-concave

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5
Q

What is the function of the TMJ disc?

A
  • Seperates the joint cavity into 2 functional components.

- Allows dispersion of forces.

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6
Q
  • The TMJ upper joint is a plane gliding joint for _________ of mandibular condyles.
  • The TMJ lower joint is a hinge joint that permits _______ of condyles.
A
  • translation

- rotation

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7
Q
  • The __________ laminae is a ligament from the temporal bone to the posterior border of the disc.
  • There is a __________ network within these elastic fibers.
  • These are elastic fibers that aid in disc recoil during mouth ________.
A
  • retrodiscal
  • neurovascular
  • closing
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8
Q

What are the functions of the retrodiscal laminae?

A
  • Stabilize the disc.
  • Prevents excessive translation of the disc over the condyle.
  • With anterior dislocation of the disc, the highly innervated laminae may be approximated between the mandibular condyle and mandibular fossa.
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9
Q

The ______________ ligament is a thickening of the anterior joint capsule from the neck of the mandible to the zygomatic arch.

A

tempromandibular ligament

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10
Q

The tempromandibular ligament helps prevent __________ dislocation of the joint, prevents _______ slippage of the disc, and counters the _______ _________ pull.

A
  • posterior
  • medial
  • lateral pterygoid
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11
Q

MUSCULATURE

A

MUSCULATURE

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12
Q

What are the muscles of mastication?

A
  • Temporalis
  • Masseter
  • Medial Pterygoid
  • Lateral Pterygoid
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13
Q

What are the suprahyoid muscles?

A
  • Stylohyoid
  • Digastric
  • Geniohyoid
  • Mylohyoid
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14
Q

What are the infrahyoid muscles?

A
  • Thyrohyoid
  • Sternothyroid
  • Sternohyoid
  • Omohyoid
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15
Q

Temporalis:

  • Origin?
  • Insertion?
  • Action?
A
  • Origin- temporal fossa
  • Insertion- coronoid process on anterior ramus of mandible
  • Action- elevate mandible
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16
Q

Masseter:

  • Origin?
  • Insertion?
  • Action?
A
  • Origin- inferior and medial zygomatic arch
  • Insertion- coronoid process of lateral ramus of mandible
  • Action- elevation and protrusion of mandible
17
Q

Medial Pterygoid:

  • Origin?
  • Insertion?
  • Action?
A
  • Origin- medial surface of lateral pterygoid plate, pyramidal process of palatine bone, tuberocity of maxilla
  • Insertion- medial aspect of mandibular ramus
  • Action- elevate and protrusion of mandible
18
Q

Lateral Pterygoid:

  • Origin?
  • Insertion?
  • Action?
A
  • Origin- superior head to lateral surface of greater wing of sphenoid bone, inferior head to lateral surface of lateral plate
  • Insertion- neck of mandible, articular disc, TMJ capsule
  • Action- protrude and depress mandible, lateral deviation of mandible
19
Q
  • What muscles close the mouth?

- What muscles open the mouth?

A
  • Close = temporalis, masseter, medial pterygoid

- Open = lateral pterygoid

20
Q

The infrahyoid muscles are innervated by branches of C_-C_ and act to ________ the hyoid.

A
  • C1-C3

- depress

21
Q

The suprahyoid muscles act to _______ the hyoid. The _______ depresses the mandible against resistance and elevates the hyoid.

A
  • elevates

- digastric

22
Q

NORMAL BIOMECHANICS

A

NORMAL BIOMECHANICS

23
Q

During mouth opening, the first half of motion is a _______ that occurs at the ______ portion of the TMJ.

A
  • rolling

- lower

24
Q

During mouth opening, the second half of motion is a __________ __________ along the temporal bone in the _______ portion of the TMJ.

A
  • anterior translation

- upper

25
Q

As the joint moves anteriorly, it also moves ___________, resulting in what?

A
  • inferiorly

- greater mouth opening, separation of teeth

26
Q

NEUROVASCULAR STRUCTURES

A

NEUROVASCULAR STRUCTURES

27
Q

The __________ nerve is a branch of the trigeminal nerve that provides motor innervation to the muscles of mastication.

A

-mandibular

28
Q

What is the sensory input from the mandibular nerve?

A

Teeth, temporal region, external auditory meatus, tympanic membrane, lower lip, lower face, mucosa anterior 2/3rds of the tongue, floor of oral cavity

29
Q

The _________ artery comes off of the external carotid artery to provide for structures of the TMJ.

A

maxillary

30
Q

ARTHROLOGY

A

ARTHROLOGY

31
Q

The disc functionally seperates the TMJ into _______ and _____ joint cavities.

A

upper and lower

32
Q
  • 50% of motion occurs as rolling in the _______ joint.
  • During this, the _________ moves on the ____________.
  • The disc remains _____________.
A
  • lower
  • condyle on temporal bone
  • stationary
33
Q
  • 50% of motion occurs as gliding in the ______ joint.
  • This portion begins at ____-opening.
  • The disc is pulled ____________ by the _______________.
  • The condyle moves along the sigmoid shaped ______________.
  • The disc ________ along with the condyle.
A
  • upper
  • mid-opening
  • anteromedially, lateral pterygoid
  • temporal bone
  • slides
34
Q

Normal Osteokinematic Motion:

  • Opening?
  • Lateral Deviation?
  • Protrusion?
  • Retrusion?
A
  • Opening = 35-50mm
  • Lateral Deviation = 10-15mm
  • Protrusion = 3-6mm
  • Retrusion = 3-4mm
35
Q
  • What is the resting position of the TMJ?

- What is the close-packed position of the TMJ?

A
  • slight opening

- fully closed

S3- Musculoskeletal (27 decks)

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