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Occlusion > Muscles and Ligaments > Flashcards

Muscles and Ligaments Flashcards

1
Q

Masseter

A
  • Origin: Zygomatic arch
  • Insertion: Lateral surface of ramus, coronoid process, angle of mandible
  • Action: Mandible elevated and teeth contact; Sup portion protrudes mandible and biting force; Deep portion stabilizes mandible
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2
Q

Temporalis

A
  • Origin: Temporal fossa, temporal fascia
  • Insertion: Coronoid process and anterior border of ramus
  • Action: Elevates mandible, retracts and positions mandible, clenches teeth
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3
Q

Medial Pterygoid

A
  • Origin: Medial surface of lateral pterygoid plate, pyramidal process, and maxillary tuberosity
  • Insertion: Posterior and lower part of medial surface of ramus and angle of mandible
  • Action: Elevates and protrudes mandible, assists rotary movements (lateral) of mandible
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4
Q

Lateral Pterygoid (Inferior)

A
  • Origin: Lateral surface of lateral pterygoid plate
  • Insertion: Anterior portion of condylar neck and TMJ capsule
  • Action: Protrusion of mandible (bilateral), mediotrusion of mandible to opposite side (unilateral), assists digastric in opening mandible
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5
Q

Lateral Pterygoid (Superior)

A
  • Origin: Infratemporal surface of greater wing of sphenoid
  • Insertion: Articular capsule, disc, and neck of condyle
  • Action: Closure of mandible, “power stroke” of mandible (chewing against resistance)
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6
Q

Digastric

A

Anterior Belly
- Origin: Mastoid Notch
- Insertion: Intermediate tendon of hyoid
Posterior Belly
- Origin: Lingual surface of mandible
- Insertion: Intermediate tendon of hyoid
- Action: Depress and pull mandible backward (bilateral), Elevate hyoid and facilitate swallowing (when mandible stabilized)

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7
Q

Suprahyoid muscles

A

Attach mandible to hyoid

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8
Q

Infrahyoid muscles

A

Attach hyoid to clavicle and sternum

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9
Q

Protraction

A
  1. Temporalis (anterior part)
  2. Lateral pterygoid (inferior)
  3. Medial pterygoid
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10
Q

Retraction

A
  1. Temporalis (posterior part)

2. Digastric

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11
Q

Opening

A
  1. Hyoid complex (initial 20 mm)

2. Lateral pterygoid (inferior)

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12
Q

Closing

A
  1. Temporalis
  2. Superior lateral pterygoid
  3. Medial pterygoid
  4. Masseter (deep)
  5. Masseter (superficial)
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13
Q

Mandibular movements

A
  1. Opening
  2. Closing
  3. Working
  4. Non-working
  5. Protrusive
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14
Q

Bennett Angle

A

Angle formed between sagittal plane and the average path of the advancing condyle as viewed in the horizontal plane during lateral mandibular movement

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15
Q

Major Movements of Rotating Condyle

A
  1. Laterotrusion
  2. Latero-detrusion
  3. Latero-sutrusion
  4. Latero-protrusion
  5. Latero-retrusion
  6. Latero-pro-sutrusion
  7. Latero-pro-detrusion
  8. Latero-re-sutrusion
  9. Latero-re-detrusion
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Occlusion (1 decks)

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