infratemporal fossa Flashcards Preview

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Flashcards in infratemporal fossa Deck (53):
1

identify

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infratemporal fossa 

2

identify

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zygomatic arch 

3

identify

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temporalis m.

4

identify

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coronoid process of mandible 

5

origin and insertion of temporalis m.

o: floor of temporal fossa; deep surface of temporal fascia

I: coronoid process

6

innervation and action of temporalis

N: mandibular nerve (CN V3)

A: elevate and retract mandible 

7

Name this ligament 

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temporomandibular ligament: runs from temporal bone to neck of mandible 

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8

what is the action of the temporomandibular ligament

restricts posterior and lateral movement 

9

Name and give action for the purple ligament

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sphenomandibular ligament

Action: provides passive support

10

The temporomandibular joint (TMJ) is composed of an articular disc surrounded by cavities.  Give the actions of the superior cavity and inferior cavity of the TMJ

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  • superior cavity: protrusion/retrusion (gliding/translation)
  • inferior cavity: hinge movement (depression/elevation) 

11

What is the pin pointing to

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Lingula of mandible 

12

Identify 

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pterygomaxillary fissure 

13

identify

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mandibular fossa

14

identify red arrow

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articular tubercle 

15

red arrow

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temporal surface of sphenoid bone 

16

blue arrow 

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infratemporal surface of sphenoid bone 

17

black arrow

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lateral pterygoid plate 

18

identify both 

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red: medial pterygoid plate of sphenoid

pin: lateral pterygoid plate of sphenoid

19

identify 

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forman spinosum 

20

muscles of the infratemporal fossa are muscles of mastication.  What nerve innervates these muscles?

motor supply from mandibular n. (CN V3) 

21

identify

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masseter m. 

22

origin and insertion of masseter m

o: inferior border of zygomatic arch

i: lateral surface of ramus and angle of the mandible

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23

Innervation and action of masseter m

N: mandibular n. (CN V3)

A: elevate and protrude mandible 

24

identify 

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superior and inferior heads of lateral pterygoid muscle 

25

Origin of lateral pterygoin

superior: infratemporal surface of the greater wing of sphenoid

inferior: lateral surface of lateral pterygoid plate

26

insertion of lateral pterygoid m.

superior: articular disc and capsule of TMJ

inferior: pterygoid fovea and capsule of TMJ

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27

action of lateral pterygoid m.

protrude mandible and depress chin 

28

side to side movements of the anterior mandible can be produced by unilateral use of muscles.  Defind ipsilateral and contralateral excursion

ipsilateral excursion: retraction done on same side of muscle

contralateral excursion: protrusion done on opposite side of muscle 

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29

identify 

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Superficial and deep head of medial pterygoid muscle 

30

origin of medial pterygoid muscle

superior head: maxillary tuberosity

Deep head: medial surface of lateral pteryoid

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31

Insertion of medial pterygoid m.

same for both superior and deep heads: medial surface of ramus of mandible 

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32

innervation and action of medial pterygoid m.

N: Mandibular n. (CN V3)

A: elevate and protrude mandible 

33

Depression of the mandible is done by which 3 muscles

  • gravity
  • suprahyoid muscle
  • infrahyoid muscle
  • lateral pterygoid

34

Elevation of the mandible is done via which 3 muscles

  • temporalis
  • masseter
  • medial pterygoid 

35

Protrusion of mandible is done by which 3 muscles

  • lateral pterygoid
  • superficial masseter
  • medial pterygoid 

36

retraction of mandible is done by which muscles

  • temporalis posterior fibers (prime)
  • anterior belly of digastric 

37

What artery is a branch off of the external carotid artery and can lie superfial or deep to the lateral pterygoid muscle?

maxillary artery 

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38

The maxillary artery can be split into 3 sections based on the position to what muscle? 

Lateral pterygoid m.

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39

The 1st (mandibular) part of the maxillary artery lies lateral/posterior to lateral pterygoid. Give the two main branches off of this section

  • middle meningeal: passes through foramen spinosum
  • inferior alveolar artery: passes through mandibbular foramen

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40

The auricotemporal nerve is split by what artery?

middle meningeal artery

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41

Name the branches off of the 2nd (pterygoid) part of the maxillary artery that lies superficial/deep to lateral pterygoid m.

muscular branches 

  • temporalis
  • pterygoids
  • masseter
  • buccinator

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42

The maxillary vein connects to what venous plexus that lies in the infratemporal fossa

pterygoid plexus of veins 

43

What nerve enters the infratemporal fosaa through the foramen ovale and carries both motor and sensory brances

mandibular nerve (CN V3) 

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44

The auriculotemporal nerve is a branch off of what nerve?

mandibular nerve (CN V3)

45

The auricotemporal nerve supplies what type of innervation

  • sensory to TMJ
  • parasympathetic postganglionics to parotid gland 

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46

What is the otic ganglion?

paraympathetic ganglion located immediately below the foramen ovale where synapse occurs in the innervation to parotid gland

* glossopharyngeal n. (CN IX) -> tempanic n. -> tympanic plexus -> lesser petrosal n. -> otic ganglion -> auriculotemporal n. -> parotid gland 

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47

The inferior alveolar nerve is a branch off of what main nerve?  What are its distinguishing features

  • mandibular n. (CN V3)
  • enters mandibular forman and passes through mandibular canal
  • sensory 

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48

Mental nerve is a branch off of what nrve.  What is its distinguishing feature? What type of innervation does it supply?

  • inferior alveolar n.
  • exits mental foramen
  • sensory 

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49

The nerve to mylohyoid is a branch off of what nerve?

What type of innervation does it supply

  • inferior alveolar n.
  • motor innervation to mylohyoid and anterior belly of digastric 

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50

The ligual nerve is a branch off of what nerve? What type of innervation does it suppy

  • branch of mandibular n. (CN V3): anterior to inferior alveolar n.
  • sensory
  • joined by chorda tempani n. (From CN VII)

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51

Chorda tympani.  Where does it come from? What nerve does it join?

  • branch of facial nerve (CN VII)
  • joins lingual nerve to provide taste sensory to tongue 

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52

What type of innervation does chora tympani provide and to what structure

  • preganglionic parasympathetics destined for submandibular ganglion
  • taste for anterior 2/3 tongue 

53

Name the two parts that make up the zygomatic arch

  • zygomatic process of temporal bone
  • temporal process of zygomatic bone 

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