TMJ and muscles of mastication Flashcards

1
Q

what type of joint is the TMJ?

A

modified hinge synovial joint

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2
Q

what type of cartilage covers the articular surfaces of the TMJ?

A

fibrocartilage

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3
Q

what ligaments are involved in the TMJ?

A

2 extrinsic =
- sphenomandibular
- stylomandibular

1 intrinsic =
- lateral ligament

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4
Q

what are the 5 movements that the TMJ permits?

A
  • protrusion
  • retraction
  • elevation
  • depression
  • lateral movements
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5
Q

what pharyngeal arch do the muscles of mastication derive from?

A

first pharyngeal arch

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6
Q

what are the muscles of mastication innervated by?

A

CNV

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7
Q

where does the temporalis muscle originate from?

A

temporal fossa & fascia

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8
Q

where does the temporalis muscle insert into?

A

coronoid process of mandible & anterior border of ramus

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9
Q

what is the function of the temporalis muscle?

A

retracts & elevates the mandible

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10
Q

what is the temporalis muscle innervated by?

A

deep temporal nerves from CNV3

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11
Q

where does the masseter muscle originate from?

A

maxillary process of zygomatic bone & anterior 2/3rd of inferior border of zygomatic arch

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12
Q

where does the masseter muscle insert into?

A

angle & lateral surface of ramus of mandible

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13
Q

what is the function of the masseter muscle?

A

elevates the mandible

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14
Q

what is the masseter innervated by?

A

masseteric nerve from CNV3

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15
Q

where does the medial pterygoid originate from?

A

medial surface of lateral pterygoid & maxillary tuberosity & pyramidal process of palatine bone

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16
Q

where does the medial pterygoid insert into?

A

medial surface of the ramus & angle of mandible

17
Q

what is the function of the medial pterygoid?

A
  • elevates mandible
  • assists with lateral movements
18
Q

what nerve innervates the medial pterygoid?

A

nerve to medial pterygoid from CNV3

19
Q

where does the lateral pterygoid originate from?

A

infratemporal surface of greater wing of sphenoid bone & lateral surface of lateral pterygoid plate

20
Q

where does the lateral pterygoid muscle insert?

A

front of the neck of the mandible

21
Q

what is the function of the lateral pterygoid?

A

protrudes the mandible
- assists with lateral and depression movements too