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Neuro-Unit 1 > Wednesday, 3-30-Muscles Of Mastication, TMJ, And Infratemporal Fossa (Stephens) > Flashcards

Wednesday, 3-30-Muscles Of Mastication, TMJ, And Infratemporal Fossa (Stephens) Flashcards

1
Q

The sphenomandibualr ligament is a thickened band of pterygoid fascia between the sphenoidal spine and the lingula of the mandible. What passes between this ligament and the neck of the mandible?

A
  • Maxillary a. And v.

- Auriculotemporal n.

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2
Q

What innervates the muscles of mastication?

A

-Mandibular branches of V (V3) and named according to the corresponding muscle

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3
Q

What is the arterial supply to muscles of mastication?

A

Branches of the 2nd part (Pterygoid) of the MAXILLARY artery, and named according to corresponding muscle

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4
Q

Fracture-dislocations of the mandible anterior to the angle of the mandible will cause the proximal portion to displace what direction?

A

Upward and forward

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5
Q

__ muscle is medial and parallel to the masseter muscle. Functionally, it closes the jaw and is innervated by a branch of V3

A

Medial pterygoid

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6
Q

The lateral pterygoid muscle has 2 heads: ___ head inserts on the articular disc of the TMJ and ___ head inserts on the pterygoid fossa of the mandible. It is innervated by a branch of V3

A

Upper head

Lower head

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7
Q

Describe the course of the maxillary a. And buccal n. Relative to the pterygoids:

A

The maxillary a. And buccal n. (Buccal branch of V; long buccal n.; buccinator n.) usually pass BETWEEN THE 2 HEADS OF THE LATERAL PTERYGOID

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8
Q

Describe the course of the inferior alveolar and lingual nerves relative to the pterygoids:

A

They course between the medial and lateral pterygoids

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9
Q

Regarding the jaw-jerk reflex:

Rapid depression of the chin (stimulus) causes stretching of neuromuscular spindles in the masseter muscle. Afferent fibers course in the masseteric n and synapse on the ___ nucleus and leave via the __ nucleus then course in the masseteric n. And act on neuromuscular endplates in the masseter muscle. The response is contraction of masseter muscle

A

Mesencephalic nucleus of V (Sensory nucleus)

Motor nucleus of V

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10
Q

Describe the muscles involved in NORMAL OPENING OF THE MOUTH:

A
  • Gravity

- Lateral pterygoid

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11
Q

Describe the muscles involved in WIDE OPENING OF THE MOUTH

A
  • Lateral pterygoid

- Suprahyoid muscles

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12
Q

List the muscles involved in CLOSING THE MOUTH:

A
  • Temporalis
  • Masseter
  • Medial pterygoid
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13
Q

The ___ joint of the TMJ is a gliding joint and permits extensive sliding movement along its s-shaped surface

A

Superior

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14
Q

The __ joint of the TMJ is hinge-type joint between the articular disk and mandibular condyle

A

Inferior

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15
Q

This ligament associated with the TMJ has the maxillary vessels and auriculotemporal n pass between it and the neck of the mandible

A

Sphenomandibular ligament

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16
Q

This ligament associated with the TMJ biomechanically changes the transverse axis of rotation from a line between the mandibular condyles to a line between the lingulae. This makes it much EASIER TO OPEN THE MOUTH

A

Stylomandibular ligament

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17
Q

With the development of ___, an adult has a mental angle of about 110-120 degrees (compared to 140 of a child and 175 of newborn)

A

Dentition

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18
Q

In a senior patient who has regressive change in the mental angle (back to 140 degrees), what is usually the cause?

A

-An edentulous condition (lacking teeth) with corresponding alveolar bone resorption is causative

19
Q

Describe the potential structures involved in a fracture of the NECK OF THE MANDIBLE:

A
  • Auriculotemporal n.

- Maxillary a. Or v.

20
Q

Describe the potential structures involved in a fracture of the RAMUS OF THE MANDIBLE:

A
  • Lingual n.

- Inferior alveolar nerves

21
Q

Describe the potential structures involved in a fracture of the BODY OF THE MANDIBLE:

A

-Inferior alveolar nerve and vessels

22
Q

List contents of the infratemporal fossa:

A
  • Tendon of temporalis m.
  • Medial and lateral pterygoids
  • Buccinator m.
  • Maxillary a. And its branches
  • Mandibular division of V (V3) and its branches
  • Pterygoid venous plexus
23
Q

THe long buccal n. Can be found by finding the ___ band

A

Temporal buccinator

24
Q

Which nerve in essentially gets you to all of the infratemporal fossa structures?

A

Long buccal nerve

25
Q

___ is a large sensory ganglion and for the V3 and is also called the semilunar or Gasserian ganglion

A

Trigeminal ganglion

26
Q

The trunk of the V3 passes through the __ and has 4 branches before it splits into anterior and posterior divisions

A

Foramen ovale

27
Q

___ is a small ganglion located on the medial side of V3 or attached to the nerve to the medial pterygoid. It sends postganglionic fibers to the parotid gland via the auriculotemporal n.

A

Otic ganglion

28
Q

___ is branch of V3 that supplies GSA fibers to the meningeal dura via the foramen spinosum

A

Recurrent meningeal n.

29
Q

The ___ nerve supplies GSA fibers to the epithelia of the inner and outer cheek

A

Buccal

30
Q

__ nerve (V3 branch) sends sensory fibers to skin of temporal region, TMJ, and external auditory meatus. It also receives postganglionic sympathetic fibers from the middle meningeal plexus which will terminate in the parotid gland

A

Auriculotemporal

31
Q

___ n. (V3 branch)supplies GSA sensory fibers to the anterior 2/3 of the tongue and descends anteromedial to the inferior alveolar nerve between the medial pterygoid and masseter muscles

A

Lingual n.

32
Q

The __ n. (V3 branch) joins the lingual nerve medial to the mandibular chondyle and courses with that nerve to supply SVA fibers to the anterior 2/3 of the tongue and GVE parasympathetic fibers to the submandibular and sublingual glands

A

Chorda tympani

33
Q

The ___ n. (V3 branch) is posterolateral to the lingual and is slightly larger. It gives off the nerve to the mylohyoid. Within the lower jaw, it supplies GSA fibers to the teeth and gingivae

A

Inferior alveolar n.

34
Q

At the mental foramen, the inferior alveolar n. Terminates as the ___ nerve which supplies GSA fibers to the chin region

A

Mental

35
Q

__ is the terminal branch of the ECA, originates deep to the neck of the mandible, and courses between the mandibular neck and sphenomandibular ligament

A

Maxillary a.

36
Q

What are the 3 portions of the maxillary a.?

A

Mandibular
Pterygoid
Sphenopalatine

37
Q

This artery off of the mandibular (1st) portion of the maxillary a. Splits the auriculotemporal n. Before passing through the foramen spinosum along with a specific branch of V3. At the level of the pterion, it splits into anterior and posterior branches, and supplies most of the dura mater and endocranium

A

Middle meningeal a.

38
Q

The ___ artery may be ruptured with head trauma. The hemorrhaging separates the endocranium and dura mater, creating a rapidly expanding blood clot in the epidural space known as a epidural hematoma

A

Middle meningeal

39
Q

__ is usually a branch of the maxillary a., or a branch of the middle meningeal. It passes through the foramen ovale and supplies the trigeminal ganglion

A

Accessory meningeal a.

40
Q

The __ a. Is a branch off of the mandibular (1st) portion of maxillary artery and supplies the mandbile, teeth, and gingivae. It terminates as the mental a. At the mental foramen

A

Inferior alveolar

41
Q

This branch of the sphenopalatine (3rd) portion of maxillary a. Branches lateral to the pterygomaxillary fissue. It penetrates the posterior surface of the maxilla and supplies the molar teeth and gingiva of the upper 1/2 of the jaw

A

Posterior superior alveolar a.

42
Q

___ artery is the terminal branch of the maxillary a. It is the major arterial supply to the nasal cavity, through its 2 major branches: posterior lateral nasal artery (supplies posterolateral wall of nasal cavity) and posterior septal artery

A

Sphenopalatine

-Want to avoid nasal bleeding in posterior 2/3 of nasal cavity

43
Q

___ covers the medial surface of the medial pterygoid and splits around the lateral pterygoid. It is continuous with the stylomandibular ligament, deep parotid fascia, and superficial fascia of the neck

A

Pterygoid fascia

Neuro-Unit 1 (13 decks)

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