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Head (anatomy) > Temporomandibular Joint > Flashcards

Temporomandibular Joint Flashcards

(57 cards)

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1
Q

TMJ consists of what

A

Mandible bone suspended from the temporal bone via ligaments and muscles

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2
Q

What type of joint is the TMJ

A

True Synovial joint

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3
Q

TMJ is formed by what

A

Condyle of the mandible and mandibular fossa of the temporal bone

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4
Q

The temporal and mandibular bone is separated by what

A

A meniscus (articular disc) which divides the joint into two cavities which are:
Upper joint cavity (superior joint space)
Lover joint cavity (lower joint space)

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5
Q

What surrounds the articular surface and blends with the articular disc

A

Fibrous capsule

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6
Q

The articular disc is lined by synovial membrane except where

A

Disc surface

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7
Q

Ligaments strengthening the TMJ and their position

A

Temporomandibular ligament - lateral
Sphenomandibular ligament- anterior
Stylomandibular ligament- posterior

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8
Q

Stylomandibular gland separates what fro what

A

Submandibular gland from the parotid gland

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9
Q

Important relations of TMJ

A

Check slide or camera

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10
Q

What is the anterior boundary of TMJ

A

Anterior joint eminence
Lateral pterygoid muscle
Masseteric nerve and vessels

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11
Q

What is the posterior boundary of TMJ

A

External auditory meatus
Glenoid process of the parotid gland

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12
Q

What is the lateral boundary of TMJ

A

Zygomatic arch
Parotid gland
Facia
Skin

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13
Q

What is the medial boundary of TMJ

A

Styloid process
Maxillary vessels
Auriculotemporal nerve

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14
Q

What are the muscles of mastication?

A

> Temporalis (retracts the mandibles) masseter, medial pterygoid (they close the jaw)

> Lateral pterygoid (depresses and protrudes and moves the mandible from side side)

> Suprahyoid and infrahyoid muscles (they depress the mandible) .

All these muscles are innervated by V3

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15
Q

What muscles are responsible for forward movement (protraction) of the TMJ?

A

Lateral and medial pterygoid, superficial fibres of digastric muscle

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16
Q

What muscles are responsible for backward movement (retraction) of the TMJ?

A

Temporalis, deep fibres of masseter, digastric, geniohyoid muscles

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17
Q

Protraction and retraction of the TMJ occurs where

A

The superior part of the joint cavity

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18
Q

What muscles are responsible for elevation of the mandible

A

Temporalis, medial pterygoid, masseters

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19
Q

What muscles are responsible for depression of the mandible

A

Lateral pterygoid, digastric, Mylohyoid, geniohyoid, (this move t is produced by GRAVITY)

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20
Q

Elevation and depression movement of the mandible takes place where

A

Inferior compartment of the joint cavity. These movements helps in mastication and speech

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21
Q

Characteristics of the menisci disc

A

> Has synovial fluid above and below
It’s a shock absorber
it’s held in place by medial and lateral capsular ligament and retro-disc pad

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22
Q

Internal derangement of the menisci disc in 50% of people can cause

A

Anterior and medial jaw pops

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23
Q

Blood supply of the TMJ

Study These Flashcards
A

Superficial temporal artery and inferior alveolar artery (both branches of ECA), middle meningeal artery

24
Q

Nerve supply of TMJ

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A

Inferior Alveolar Nerve
Auriculotemporal nerve
Masseteric nerve

25
Auriculotemporal and masseteric nerve are branches of what nerve
Posterior and anterior division of V3 respectively
26
Clinical correlations of TMJ
>Dislocation of the jaw anteriorly: resulting from a blow against the jaw when opened >injury to the external auditory meatus >Crepitus of the TMJ: arises from delayed movement or tear in the articular disc. It’s the grinding sound of the TMJ e. g when chewing. >Branching of facial and auriculotemporal nerve arising near the joint. >Arthritis Locking of TMJ or trismus
27
Venous drainage of the TMJ
>Maxillary vein >Pterygoid venous plexus >Facial veins (ant. and post. May have come toon with 1st and 2nd)
28
Pterygoid venous plexus o is located within what and drains into what
Infratemporal fossa Maxillary vein (it receives blood from the surrounding structures and TMJ)
29
Maxillary vein + superficial temporal vein forms what within where
Retromandibular vein Parotid gland
30
Location of the infratemporal fossa
Behind the maxilla
31
Infratemporal fossa communicates with the temporal fossa through the what
The space between the zarch and temple
32
Infratemporal fossa also communicates with the middle cranial fossa through the
Foramen spinosum and foramen ovale
33
What forms the superior boundary of the Infratemporal fossa ?
Greater wing of sphenoid and squamous part of temporal bone
34
What forms the inferior boundary of the Infratemporal fossa ?
No anatomical structure
35
What forms the medial boundary of the Infratemporal fossa ?
Lateral pterygoid plate of the sphenoid bone
36
What forms the lateral boundary of the Infratemporal fossa ?
Ramus of the mandible
37
What forms the anterior boundary of the Infratemporal fossa ?
Posterior surface of the maxilla
38
What forms the posterior boundary of the Infratemporal fossa ?
Mastoid and styloid process of temporal bone and tympanic plate
39
What are the contents of the Infratemporal fossa
>Muscles: Medial and lateral pterygoid muscles and lower part of the temporalis, buccinator. >Nerves: mandibular nerve and it’s branches plus the chords tympani branch >Artery: Maxillary artery and it’s branches >Veins: pterygoid plexus, maxillary veins >Ganglion: Otic ganglion >Ligament: sphenomandibular ligament.
40
Location of the pterygopalatine fossa
It’s a small fossa located lateral to the Infratemporal fossa and below to the apex of the orbit. Lies between the lateral pterygoid plate and the maxilla.
41
What and what opens into the pterygopalatine fossa
Pterygoid canal and Anterior wall of the foramen lacerum
42
What forms the anterior boundary of the pterygopalatine fossa?
Posterior surface of the maxilla
43
What forms the posterior boundary of the pterygopalatine fossa?
Pterygoid process of sphenoid bone
44
What forms the medial boundary of the pterygopalatine fossa?
Perpendicular plate of palatine bone
45
What forms the superior boundary of the pterygopalatine fossa?
Greater wing of sphenoid bone
46
What forms the inferior boundary of the pterygopalatine fossa?
Pyramidal process of palatine bone
47
What communicates with the Infratemporal fossa anterio-sup with the orbit
through the superior orbital fissure
48
What communicates with the Infratemporal fossa posterio-sup with middles cranial fossa through
Foramen rotundum and pterygoid canal
49
What communicates with the Infratemporal fossa laterally with Infratemporal fossa through
Pterygomaxillary fissure
50
What communicates with the Infratemporal fossa medially through the
Sphenopalatine foramen
51
Contents of Infratemporal fossa
Pterogopaltine ganglion Pharyngeal branch of maxillary artery Maxillary artery (3rd part) Maxillary nerve Nerve of the pterygoid canal Nasopalatine nerve and vessels Greater palatine nerve Inferior orbital fissure
52
Clinical correlation
Lesion of the CN V3 can cause unilateral paralysis of muscke followed by atrophy Nerve block carried out in nerves in the fossa to block sensation The arteries create an anastomotic channel between the external and internal carotid arteries
53
Why are the bong landmarks of the posterior triangle
Joy Thanked Chioma and Hilda Of Precious First Friutful School . Jugular foramen . Transverse process of cervical vertebrae . Carotid canal . Hypoglossal canal . Occipital condyles . Pharyngeal tubercle . Foramen magnum . First rib .m . Styloid process
54
OIIABS of Temporalis muscle
O: temporal fossa I: Coronoid process and anterior border of ramus of mandible I: Deep temporal branches of mandibular nerve A: anterior fibres- elevate the mandible Posterior- retracts the mandible Blood supply: Deep temporal branches from maxillary artery, middle temporal branch from superficial temporal artery
55
OIIABS of masseter muscle
O: Zygomatic arch I: Ramus and angle of mandible I: Masseteric branch of the CN V3 A: Elevation of the mandible Superficial fibres: protracts the mandible Deep fibres: retracts the mandible BS: Masseteric artery
56
Lateral pterygoid muscle OIIABS
O: upper head- Infratemporal surface of greater wing of sphenoid bone Inferior head- lateral surface of the lateral pterygoid plate I: pterygoid fovea and capsule of TMJ I: superior head and lateral half of inferior head: buccal branch of CN V3 Medial half of inferior head: directly from CN V3 A: depresses the mandible and protracts the mandible, moves the mandible from side to side Blood supply: pterygoid branches of the maxillary artery and the ascending palatine branch of the facial artery.
57
OIIABS of medial pterygoid muscle
O: Deep head - medial surface of lateral pterygoid plate Superficial head: Tuberosity of maxilla I: inner/ medial surface of angle and ramus of mandible I: Medial pterygoid nerve (of mandibular nerve (CN V3) A: elevates the mandible , protracts the mandible Blood supply: Pterygoid branches (maxillary artery, buccal artery, facial artery)

Head (anatomy) (19 decks)

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