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Anatomy 203 > Temporomandibular Joint > Flashcards

Temporomandibular Joint Flashcards

1
Q

The Temporo-Mandibular Joint consists of _____ bone suspended from the _____ bone via ______ and ______

A

Mandible
Temporal
Ligaments and muscles

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2
Q

TMJ is a true synovial joint.
True/False
Why?

A

True
It is a true synovial joint because it is able to perform movements such as gliding, hinging, sliding and slight rotation

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3
Q

Both bones that make up TMJ are separated by a _______ which divides it into ______cavities

A

Meniscus disc
Two

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4
Q

TMJ is made of _______ of mandible articulating with _______ of temporal bone.

A

Condyloid process
Mandibular Fossa

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5
Q

At the TMJ _______ surrounds the articular surfaces and blends with ______.

A

Fibrous capsules
Articulate disc

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6
Q

TMJ is lined by __________ except the _____________

A

Synovial membrane
Articular disc surface

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7
Q

TMJ has _______ strengthening its joints.

A

Ligaments

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8
Q

The ligaments of the TMJ are:
(hint: three answers with their positions)

A

temporomandibular – lateral
sphenomandibular - anterior
stylomandibular - posterior

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9
Q

The maxillary vessel lies between the ______ ligament and the _____

A

Sphenomandibular
Neck of condyle

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10
Q

Stylomandibular ligament separates the
_______ gland from the ______ gland

A

Submandibular
Parotid

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11
Q

External carotid artery divides into terminal branches behind the ____

A

Neck

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12
Q

___________ lies between the sphenomandibular ligament and neck of condyle.

A

Maxillary vessel

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13
Q

____________ ligament separates the submandibular gland from the parotid gland

A

Stylomandibular

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14
Q

__________ divides into terminal branches behind the neck.

A

External Carotid artery

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15
Q

__________ enters the mandibular foramen

A

Inferior Alveolar Nerve

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16
Q

______ nerve runs parallel, medial and posterior to the inferior alveolar nerve

A

Lingual

17
Q

Lingual nerve runs _____ , ______ , ______ to the inferior alveolar nerve

A

Parallel
Medial
Posterior

18
Q

Anterior boundary of TMJ

A

anterior joint eminence
(Lateral pterygoid muscle , masseteric nerve and vessels)

19
Q

Posterior boundary of TMJ:

A

external auditory meatus
(glenoid process of parotid gland)

20
Q

Lateral boundary of TMJ:

A

zygomatic arch
(parotid gland, fascia and skin)

21
Q

Medial boundary of TMJ:

A

styloid process
(maxillary vessels and auriculotemporal nerve)

22
Q

List all the muscles of mastication:

A

Temporalis
Masseter
Medial Pterygoid
Lateral Pterygoid
Suprahyoid and Infrahyoid

23
Q

Anterior part of Temporalis _____

A

Closes the jaw

24
Q

Posterior part of temporalis _____

A

Retracts the jaw

25
Q

Masseter muscle performs what action:

A

Closes the jaw

26
Q

Medial Pterygoid muscle performs what action?

A

Closes the jaw

27
Q

Lateral Pterygoid muscle performs what actions:

A

depresses, protudes and moves the mandible from side to side

28
Q

Suprahyoid and Infrahyoid muscle performs what action:

A

Depression of mandible

29
Q

All the muscles of mastication are innervated by:

A

Mandibular division of trigeminal nerve

30
Q

What is protraction?
What muscles perform protractions?

A

It is the forward movement of the mouth
Lateral Pterygoid
Medial pterygoid
Superior fibres of masseter

31
Q

What is retraction?
What muscles perform retraction?

A

It is the backward movement of the mouth
Temporalis
Deep fibers of masseter
Digastric
Geniohyoid

32
Q

Protraction and Retraction occurs in the _____

A

Superior compartment

33
Q

Elevation is produced by:

A

Temporalis
Masseter
Medial pterygoid

34
Q

Depression is produced by;

A

Gravity,
Lateral pterygoid,
Digastric,
Geniohyoid,
Mylohyoid

35
Q

Lateral rotation is produced by:

A

Medial Pterygoid
Lateral Pterygoid

36
Q

Meniscus disc is held in place by ______ and ______ and _____

A

Medial Capsular ligament
Lateral capsular ligament
Retro-disc pad

37
Q

Synovial fluid can be found only above the meniscus disc.
True/False

A

False; synovial fluid can be found above and below the meniscus disc.

38
Q

Blood and Nerve Supply of TMJ:

A

Superficial temporal – terminal branch external carotid artery
•Maxillary artery – from external carotid artery
•Inferior alveolar nerve – mylohyoid and lingular
•Middle meningeal
•Auriculotemporal nerve - from the posterior division of mandibular branch
•Masseteric nerve - from anterior division of the mandibular branch trigeminal of

39
Q

Clinical considerations of TMJ:

A

Dislocation of the jaw anteriorly resulting from blow against the jaw when opened
•Injury to the external auditory meatus
•Crepitus of TMJ arises from delayed movement of the articular disc
•Branching of facial nerve and auriculo- temporal nerve arising near the joint
•Arthritis of the joint – inflammatory changes causing pains and functional deficit
•Locking of jaw in tetanus and paralyses of

Anatomy 203 (11 decks)

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