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Anatomy Week 16 > Parker SG (Temporal Fossa and Infratemporal Fossa) > Flashcards

Parker SG (Temporal Fossa and Infratemporal Fossa) Flashcards

1
Q

What region is the pterion located in?

A

Temporal Fossa

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2
Q

Why is getting hit in the pterion particularly dangerous?

A
  1. Its the weakest part of the skull
  2. Middle Meningeal a. runs deep to it

***Epidural Hematomas can happen relatively easily

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3
Q

What are 5 important fissures/ foramina in the Infratemporal Fossa?

A
  1. Foramen Ovale
  2. Foramen Spinosum
  3. Ptergomaxillary Fissure
  4. Ptergotympanic Fissure
  5. Alveolar Foramen
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4
Q
  • *What passes through the Pterygotympanic Fissure?

- opens into?

A

**Chorda Tympani (CN VII)

  • Opens into - Infratemporal Fossa (ITF)
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5
Q

What passes through Foramen Ovale?

- Opens into?

A
  1. Mandiblar n. (V3)
  2. Lesser Petrosal n. (IX)
  3. Accessory meningeal a.
  • Opens middle cranial fossa to ITF
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6
Q

What passes through Foramen Spinosum?

- Opens into?

A

Middle Meningeal a.

  • Opens middle cranial fossa to ITF
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7
Q

What passes through the Pterygomaxillary Fissure?

- Opens into?

A
  1. Maxillary a.

- Connects Ptergygopalatine Fossa to Infratemporal Fossa (ITF)

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8
Q

Space between what two bones creates the Pterygomaxillary Fissure?

A

Anterior:
Maxillary (posterior surface)

Posterior:
Pterygoid Processes (anterior surfaces)
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9
Q

What bone is the pterygotympanic fissure found on?

A

Temporal Bone

sphenoid may contribute a bit medially

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10
Q

What are the most important contents of the ITF?

A
  1. Muscles of Mastication
  2. V3 and its branches
  3. Maxillary a. (1st, 2nd div.)
  4. Pterygoid Plexus
  5. Maxillary v. (arises from Pterygoid Plexus)
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11
Q

What are the 4 muscles of mastication?

A
  1. Temporalis
  2. Medial Pterygoid
  3. Lateral Ptergyoid
  4. Masseter
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12
Q

What is the common innervation of all the muscles of mastication?

A
  • Motor Branches from V3
  • Deep Temporal n.
  • N. to medial Pterygoid
  • N. to Lateral Pterygoid
  • Massenteric n.
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13
Q

What is the most Important muscle for opening the mouth?

- why?

A
  • Lateral Pterygoid

* Because it can protrude the Jaw

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14
Q

*****KNOW THE MUSCLE TABLE COLD

A

*****KNOW THE MUSCLE TABLE COLD

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15
Q

Where does the upper head of lateral Pterygoid insert?

A
  • Into the ARTICULAR DISK of TMJ
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16
Q

What is the origin of the lower head of the lateral Pterygoid?
-insertion?

A
  • LATERAL surface of LATERAL pterygoid Plate

- Inserts into Fovea of Mandible

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17
Q

What are the two heads of medial and lateral pterygoid?

A

Medial Pterygoid- Superficial and Deep Heads

Lateral Pterygoid - Upper and lower heads

18
Q

What is the origin of the DEEP head of the medial pterygoid?

A

MEDIAL surface of LATERAL pterygoid Plate

19
Q

What does temporalis insert?

A

CORONOID process of the mandible

20
Q

What are the two motions achieved by the articular disk?

- locations of these motions?

A

Sliding - ABOVE articular disk

Hinge - BELOW articular disk

21
Q

What are all of the muscles innervated by V3?

A

MAST

  • Masseter
  • Medial Pterygoid
  • Lateral Pterygoid
  • Temporalis

MATT

  • Mylohyoid
  • Anterior Digastric
  • Tensor Tympani
  • Tensor Veli Palatini
22
Q

What two divisions are given off by V3 (mandibular n.) and what function (sensory/motor) is associated with each?

A
  1. Anterior Division
    - all motor except for Buccal n. (V3 - GSA)
  2. Posterior Division
    - all sensory except for n. to mylohyoid (V3 - GSE)
23
Q

What are the muscles and nn. of the anterior division of V3?

A
  1. Temporalis - Deep Temporal n.
  2. Masseter - Massenteric n.
  3. Lateral Pterygoid (LP) - N. to LP
  4. Buccal n. (V3)

***Note: medial Pterygoid Branches off before the division

24
Q

What are the muscles and nn. of the posterior division of V3?

A
  1. Mylohyoid via n. to Mylohyoid - only motor
  2. Auriculotemporal n.
  3. Inferior Alveolar n.
  4. Lingual n.
25
Q

What two branches are give off of V3 before division into trunks?

A
  1. N. to Medial Pterygoid
    - Medial Pterygoid
    - Tensor Veli Palatini
    - Tensor Tympani
  2. Small Meningeal Branch
26
Q

What n. travels in the mandibular foramen?

  • what does it do?
  • Plexus association?
A

Inferior Alveolar

  • GSA to mandibular teeth
  • Inferior Dental Plexus
27
Q

What is the terminal Branch of the Inferior Alveolar n.?

A

Mental n.

28
Q

Where does the mental n. exit to move onto the superficial face?
- Innervates?

A

Mental Foramen

GSA to:

  • Chin
  • Lower Lip
29
Q

What motor branch is given off by the inferior Alveolar n. leaving it with only sensory fibers?

A
  • N. to Mylohyoid
30
Q

What does the Auriculotemporal n. do?

  • GSA or GVE
  • Stuctures innervated
A

GSA to:

  • Parotid Gland
  • TMJ***
  • Lateral Scalp
  • Anterior ear
31
Q

What hitchhiker does Auriculotemporal carry?

A

Post-ganglionic from the Otic ganglion

pre-ganlgionic GVE = tympanic –> Lesser petrosal n. (IX)

32
Q

What is the relationship between the middle meningeal a. and the auriculotemporal n.?

A
  • Auriculotempral wraps around middle meningeal
33
Q

What artery does the Auriculotemporal n. Course with?

A

Superficial Temporal a.

34
Q

What branches come off the 1st division of the Maxillary Artery?

A
  1. Deep auricular a.
  2. Anterior Tympanic a.
  3. Middle Meningeal a.
  4. Inferior Alveolar a.
  5. Accessory Meningeal a.
35
Q

What branches come off the 2nd division of the Maxillary Artery?

A
  1. Massenteric a.
  2. Pterygoid a.
  3. Deep Temporal a.
  4. Buccal a.
36
Q

What branches come off the 3rd division of the Maxillary Artery?

A
  1. Sphenopalatine a.
  2. Descending Palatine
  3. Infraorbital
  4. Posterior Superior Alveolar
  5. Middle Superior Alveolar
  6. Pharyngeal a.
  7. Anterior Superior Alveolar
  8. Artery of the Pterygoid Canal
37
Q

What special relationship does middle meningeal have with a n.?

A
  • Auriculotemporal Wraps around it
38
Q

What branch from maxillary artery division runs in the mandibular foramen?

A
  • Inferior alveolar n.
39
Q

What n. does the Buccal a. run with?

A
  • Buccal n. of V3**
40
Q

What n. does the Sphenopalatine a. from branch 3 run with?

A
  • Nasopalatine n. from V2
41
Q

What 3 spaces does the 3rd part of the maxillary a. run through?

A
  1. Ptergomaxillary Fissure
  2. Pterygopalatine Fossa
  3. Sphenopalatine Foramen
42
Q

What are the contents of the infratemporal Fossa?

A
  1. Sphenomandibular Ligament
  2. Medial Pterygoid
  3. Lateral Pterygoid
  4. Maxillary a.
  5. V3 ( mandibular)
  6. Chorda Tympani
  7. IX postganglionics
  8. Pterygoid Venous Plexus

Anatomy Week 16 (12 decks)

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