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Neuro I > Lecture 11: Deep Face and Infratemporal Fossa > Flashcards

Lecture 11: Deep Face and Infratemporal Fossa Flashcards

1
Q

What are the attachments of the sphenomandibular ligament; what neurovasculature passes between this ligament and the neck of the mandible?

A
  • Between the sphenoidal spine and lingula of the mandible
  • Maxillary artery/vein and auriculotemporal nerve pass between
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2
Q

What are the 4 muscles of mastification and which muscle assists these muscles?

A

1) Temporalis m.
2) Masseter m.
3) Lateral pterygoid m.
4) Medial pterygoid m.

*The buccinator muscle assists these muscles

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3
Q

The muscles of mastification are all innervated by what nerve?

A
  • Branches of the mandibular division (V3) of Trigeminal
  • Each branch is named for the corresponding muscle
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4
Q

The muscles of mastification receive blood supply from what artery/branch?

A
  • Branches of the second (pterygoid) part of Maxillary A.
  • Each branch is named for the corresponding muscle
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5
Q

What is the insertion for the Temporalis muscle of mastification?

A

Coronoid process of mandible

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6
Q

What is the action of the vertical, horizontal, and unilateral fibers of the Temporalis muscle of mastification?

A

Vertical: Elevate the mandible

Horizontal: Retract (retrude) mandible

Unilateral: Lateral movement of mandible (chewing)

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7
Q

What is the origin and insertion of the Superficial versus Deep heads of the Masseter muscle?

A

Origin: Zygomatic bone (superficial) and Zygomatic arch (deep)

Insertion: Mandibular angle (superficial) and Mandibular ramus/inferior coronoid process (deep)

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8
Q

What is the action of the Masseter m.?

A
  • Elevates mandible
  • Assists in protraction and retraction
  • Assists in side-to-side motion
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9
Q

What is the origin and insertion of the superior versus inferior head of the Lateral Pterygoid muscle?

A

Origin (superior): Greater wing of sphenoid bone

Insertion (superior): Mandible and tempromandibular joint (articular disk)

Origin (inferior): Lateral pterygoid plate

Insertion (inferior): Mandible

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10
Q

What are the actions of the lateral pterygoid muscle working bilaterally vs. unilaterally?

A

Bilaterally: protrudes mandible (pulls articular disk forward) and opens mouth

Unilaterally: alternating actions along with ipsilateral medial pterygoid, result in side-to-side movements necessary for grinding

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11
Q

What is the origin and insertion of the superficial versus deep head of the Medial Pterygoid muscle?

A

Origin (superficial): Maxila (maxillary tuberosity) and palatine bone

Origin (deep): Medial surface of lateral pterygoid late and pterygoid fossa

Insertion (superficial/deep): Pterygoid rugosity on medial surface of the mandibular angle

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12
Q

What is the action of the Medial Pterygoid muscle working bilaterally and unilaterally?

A

Bilaterally: elevation of mandible; also acts with lateral pterygod to assist in protrusion of mandible

Unilaterally: acts with ipsilateral pterygoid to protrude mandible and produce medial movement towards the opposite side. Alternating actions between right and left side results in side-to-side chewing movements

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13
Q

Which muscle is most important for opening the manible and what musle assist this movement?

A
  • Lateral Pterygoid m.

Assisted by (suprahyoid muscles):

  • Digastric m.
  • Geniohyoid
  • Mylohyoid
  • Stylohyoid
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14
Q

What is the function of the infrahyoid muscles in opening the mandible?

A
  • Sternohyoid, Sternothyroid, Thyrohyoid, and Omohyoid
  • Help to fix the hyoid in place, allowing us to open mandible
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15
Q

Which 3 muscles are elevators of the mandible?

A
  • Temporalis m.
  • Medial Pterygoid m.
  • Masseter m.
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16
Q

Which 3 muscles are depressors of the mandible?

A
  • Lateral pterygoid ms.
  • Suprahyoid ms.
  • Infrahyoid ms.
17
Q

Which 3 muscles help with protrusion of the mandible?

A
  • Lateral pterygoid ms.
  • Medial pterygoid ms.
  • Masster m.
18
Q

Which 2 muscles help with retrusion of the mandible?

A
  • Temporalis m.
  • Massester m.
19
Q

Which muscle groups work together for lateral movements of the mandible?

A

Ipsilateral Temporalis and Masseter + Contralateral Pterygoids

20
Q

What is the function of the Sphenomandibular and Stylomandibular ligamens in regards to the TMJ?

A
  • Limit inferior excursion of the TMJ
  • Prevents dislocation when opening the mouth
21
Q

What is the innervation (specific branches) for the Masseter, Temporalis, Medial and Lateral Pterygoid ms.?

A

Masseter: masseteric n. from mandibular division (V3)

Temporalis: anterior and posterior deep temporal ns. from mandibular division (V3)

Medial Pterygoid: medial pterygoid n. from mandibular division (V3)

Lateral Pterygoid: lateral pterygoid n. from mandibular division (V3)

22
Q

What neurovasculature passes between the two heads of the lateral pterygoid m.?

A
  • Maxillary artery
  • Buccal nerve (buccal branch of V3; long buccal nerve, buccinator nerve)
23
Q

What neurovasculature passes between the medial and lateral pterygoids?

A
  • Inferior alveolar nerve
  • Lingual nerve
24
Q

Which nerves need to be considered during a surgical procedure of the TMJ due to their close relationship?

A
  • Facial n.
  • Auriculotemporal n.
25
Describe the positional shift in structures of the TMJ in TMJ dislocation; is anterior or posterior dislocation more common?
- Taking a large bite, excess contraction of lateraly pterygoids may cause heads of manible to dislocated **anteriorly** (pass anterior to the articular tubercles) - Mandible remains depressd and person is unable to close his or her mouth - Posterior dislocation is uncommon, due to presence of postglenoid tubercle and strong intinsic lateral ligament
26
Injury associated with traumatic dislocation and rupture of the articular capsule of the TMJ affects which nerve and leads to what?
- Articular branches of the Auriculotemporal nerve - Leads to laxity and instability of the TMJ
27
What are the 3 divisions of the TMJ and what type of joint is each?
1) **Superior joint** is a **gliding** joint between mandibular fossa and articular tubercle, and the articular disk 2) **Inferior joint** is a **hinge-type** joint between the articular disk and the mandibular condyle 3) **Articular disk** is attached to the _sphenomeniscus musle_ and the strong lateral (collateral) lig.
28
What neurovasculature is at risk from a fracture of the neck vs. ramus vs. body of the mandible?
**Neck**: Maxillary artery and vein, and/or Auriculotemporal nerve **Ramus:** Lingual or Inferior Alveolar nerves **Body:** Inferior Alveolar nerve and vessels
29
What are the boundaries of the Infratemporal Fossa (lateral, anterior, medial, roof, posterior, and inferior)?
Lateral = Ramus of Mandible Anterior = Maxilla Medial = Lateral Pterygoid Plate Roof = Sphenoid (greater wing) Posterior = Tympanic plate and Mastoid/Styloid Processes Inferior = Angle of the Mandible
30
What muscle and vein is associated with yawning?
- Lateral Pterygoid m. - Contraction of muscle pushes on pterygoid plexus, assisting in venous return.
31
Which nerves and ganglion are found in the Infratemporal fossa?
- Inferior alveolar (V3) - Lingual (V3) - Buccal (V3) - Chorda tympani (CN VII) - Otic ganglion
32
What nerve passes through the Foramen Ovale?
Mandibular nerve (V3)
33
What nerve passes through the Foramen Rotundum?
Maxillary nerve (V2)
34
How is anesthesia provided to nerve block the lower teeth; which nerve and where is the injection site?
- **Inferior Alveolar** nerve a branch of Mandibular (V3) - Site of injection is between **C****oronoid Notch**and**Pterygomandibular Raphe**
35
Explain the surgical approach to the pterygopalatine fossa and how it may be used in the case of chronic epistaxis; which artery is the target?
- Access is gained through the **Maxillary Sinus** via **Transantral Approach** - Posterior wall is then chipped away as needed to open the anterior wall of the pterygopalantine fossa - In case of *chronic epistaxis* (nose bleed), the **third part** of the **Maxillary artery** may be ligated in the fossa to control the bleeding

Neuro I (15 decks)

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