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Gross Anatomy III > Infratemporal Fossa > Flashcards

Infratemporal Fossa Flashcards

1
Q

What are five features of the temporal region?

A
  • Pterion
  • Temporal lines
  • Zygomatic arch
  • Infratemporal crest
  • Temporal fascia over the temporalis muscle
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2
Q

What are the posterior and superior boundaries of the temporal fossa?

A

Temporal lines

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3
Q

What is the anterior boundary of the temporal fossa?

A

Frontal and zygomatic bones

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4
Q

What is the lateral boundary of the temporal fossa?

A

Zygomatic arch

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5
Q

What is the inferior boundary of the temporal fossa?

A

Infratemporal crest

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6
Q

What is the lateral boundary of the infratemporal region?

A

Ramus of mandible

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7
Q

What is the medial boundary of the infratemporal region?

A

Lateral pterygoid plate

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8
Q

What is the anterior boundary of the infratemporal region?

A

Posterior aspect of maxilla

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9
Q

What is the posterior boundary of the infratemporal region?

A

Tympanic portion, mastoid process, styloid process

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10
Q

What is the superior boundary of the infratemporal region?

A

Inferior surface of greater wing of sphenoid

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11
Q

What is the inferior boundary of the infratemporal region?

A

Medial pterygoid attachment near the mandibular angle

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12
Q

What nerves can be found in the infratemporal fossa?

A
  • Mandibular V3 nerves (inferior alveolar, lingual, buccal)
  • Chorda tympani
  • Otic ganglion
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13
Q

What are the primary muscles of mastication?

A
  • Temporalis
  • Masseter
  • Lateral pterygoid
  • Medial pterygoid
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14
Q

Origin and insertion of temporalis

A

O: Superior temporal line
I: Coronoid process

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15
Q

What are the actions of temporalis?

A

Elevate the mandible (close jaw), retrude chin, lateral movements

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16
Q

Origin and insertion of masseter

A

O: Zygomatic bone/arch
I: Angle and ramus of mandible

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17
Q

What are the actions of the masseter?

A

Elevate the mandible (close jaw), protrude chin, retrude chin, lateral movements

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18
Q

Which muscles of mastication are innervated by anterior trunk of mandibular nerve (CN V3)?

A

Temporalis, masseter, lateral pterygoid

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19
Q

What innervates temporalis?

A

Anterior trunk of mandibular nerve via deep temporal branches

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20
Q

What innervates masseter?

A

Anterior trunk of mandibular nerve via masseteric nerve

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21
Q

What innervates lateral pterygoid?

A

Anterior trunk of mandibular nerve via lateral pterygoid nerve

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22
Q

What innervates medial pterygoid?

A

Main trunk of mandibular nerve via medial pterygoid nerve

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23
Q

What are the suprahyoid muscles?

A
  • Digastric
  • Stylohyoid
  • Mylohyoid
  • Geniohyoid
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24
Q

Origin and insertion of digastric

A

O: Base of cranium
I: Hyoid bone

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25
Q

Origin and insertion of stylohyoid

A

O: Styloid process
I: Hyoid bone

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26
Q

Origin and insertion of mylohyoid

A

O: Medial body of mandible
I: Hyoid bone

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27
Q

Origin and insertion of geniohyoid

A

O: Anterior body of mandible
I: Hyoid bone

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28
Q

What are the actions of the suprahyoid muscles?

A

Depresses mandible against resistance when infrahyoid muscles fix or depress hyoid bone

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29
Q

What innervates digastric?

A

Facial and mandibular nerves

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30
Q

What innervates stylohyoid?

A

Facial nerve (CN VII)

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31
Q

What innervates mylohyoid?

A

Mandibular nerve (CN V3) gives off nerve to mylohyoid

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32
Q

What innervates geniohyoid?

A

Nerve to geniohyoid (C1-C2)

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33
Q

What are the infrahyoid muscles?

A
  • Omohyoid
  • Sternohyoid
  • Sternothyroid
  • Thyrohyoid
34
Q

What are the actions of infrahyoid muscles?

A

Fixes or depresses hyoid bone

35
Q

Origin and insertion of omohyoid

A

O: Scapula
I: Hyoid bone

36
Q

Origin and insertion of sternohyoid

A

O: Manubrium of sternum
I: Hyoid bone

37
Q

Origin and insertion of sternothyroid

A

O: Manubrium of sternum
I: Thyroid cartilage

38
Q

Origin and insertion of thyrohyoid

A

O: Thyroid cartilage
I: Hyoid bone

39
Q

Which infrahyoid muscles are innervated by ansa cervicalis from cervical plexus (C1-C3)?

A
  • Omohyoid
  • Sternohyoid
  • Sternothyroid
40
Q

What innervates thyrohyoid?

A

C1 (via hypoglossal nerve CN XII)

41
Q

What is the main action of platysma?

A

Depresses mandible against resistance

42
Q

What is the inferior attachment/origin of platysma?

A

Subcutaneous tissue of infraclavicular and supraclavicular regions

43
Q

What is the superior attachment/insertion of platysma?

A

Base of mandible, skin of cheek and lower lip, angle of mouth (modiolus), and orbicularis oris

44
Q

What innervates platysma?

A

Cervical branch of facial nerve (CN VII)

45
Q

What are five structures found in the temporomandibular joint?

A
  • Mandibular fossa of temporal bone
  • Head (condylar process) of mandible
  • Articular disc
  • Stylomandibular ligament
  • Sphenomandibular ligament
46
Q

What muscle does the articular disc of the temporomandibular joint attach to?

A

Lateral pterygoid muscle

47
Q

Pterygoid venous plexus is between…

A

temporalis and lateral pterygoid muscles

48
Q

The pterygoid venous plexus anastomoses with…

A

facial vein, cavernous sinus, and maxillary vein

49
Q

The maxillary artery is a terminal branch of…

A

external carotid artery

50
Q

What are the three parts of the maxillary artery?

A
  1. Mandibular
  2. Pterygoid
  3. Pterygo-palatine
51
Q

Where is the mandibular part of the maxillary artery?

A

Horizontal along lower border of lateral pterygoid and deep (medial) to neck of condylar process of mandible

52
Q

What are the branches off the mandibular part of the maxillary artery?

A
  • Deep auricular artery
  • Anterior tympanic artery
  • Middle meningeal artery
  • Inferior alveolar artery
53
Q

Where is the pterygoid part of the maxillary artery?

A

Ascends adjacent (superficial or deep) to lateral pterygoid

54
Q

What are the branches off the pterygoid part of the maxillary artery?

A
  • Artery to masseter
  • Deep temporal arteries
  • Pterygoid arteries
  • Buccal artery
55
Q

Where is the pterygo-palatine part of the maxillary artery?

A

Through pterygomaxillary fissure into pterygopalatine fossa

56
Q

What are the branches off the pterygo-palatine part of the maxillary artery?

A
  • Posterior superior alveolar artery
  • Infraorbital artery
  • Artery of pterygoid canal
  • Pharyngeal branch
  • Descending palatine artery
  • Sphenopalatine artery
57
Q

Where do the following branch from:

  • Deep auricular artery
  • Anterior tympanic artery
A

Mandibular part of maxillary artery

58
Q

Where do the following branch from:

  • Middle meningeal artery
  • Inferior alveolar artery
A

Mandibular part of maxillary artery

59
Q

Where do the following branch from:

  • Artery to masseter
  • Deep temporal arteries
A

Pterygoid part of maxillary artery

60
Q

Where do the following branch from:

  • Pterygoid arteries
  • Buccal artery
A

Pterygoid part of maxillary artery

61
Q

Where do the following branch from:

  • Posterior superior alveolar artery
  • Infraorbital artery
A

Pterygo-palatine part of maxillary artery

62
Q

Where do the following branch from:

  • Artery of pterygoid canal
  • Pharyngeal branch
A

Pterygo-palatine part of maxillary artery

63
Q

Where do the following branch from:

  • Descending palatine artery
  • Sphenopalatine artery
A

Pterygo-palatine part of maxillary artery

64
Q

What is the terminal branch of the maxillary artery?

A

Sphenopalatine artery branching from pterygo-palatine part

65
Q

The mandibular nerve (V3) descends through ___ into ___

A

through foramen ovale into infratemporal fossa

66
Q

The auriculotemporal nerve encircles which artery?

A

Middle meningeal artery

67
Q

What does the auriculotemporal nerve sense?

A

Auricle, temporal region, and TMJ

68
Q

What does the auriculotemporal nerve branch from?

A

Mandibular nerve (V3)

69
Q

The inferior alveolar nerve enters…

A

mandibular foramen

70
Q

What does inferior alveolar nerve sense?

A

Lower teeth

71
Q

What does the nerve to mylohyoid branch from?

A

Inferior alveolar nerve

72
Q

What does the inferior alveolar nerve branch from?

A

Mandibular nerve (V3)

73
Q

What is the terminal branch of the inferior alveolar nerve?

A

Mental nerve

74
Q

What does the lingual nerve branch from?

A

Mandibular nerve (V3)

75
Q

Where is the lingual nerve in relation to inferior alveolar nerve?

A

Anterior to inferior alveolar nerve

76
Q

What does the lingual nerve sense?

A

Anterior 2/3 of tongue, floor of mouth, and lingual gingivae

77
Q

The lingual nerve is joined by ___ to sense taste for anterior 2/3 of tongue and provide preganglionic parasympathetic fibers to submandibular and sublingual salivary glands

A

chorda tympani nerve (VII)

78
Q

What does the buccal nerve branch from?

A

Mandibular nerve (V3)

79
Q

What is the function of the buccal nerve?

A

Sensory for cheek

80
Q

Motor nerves to masseter, tensor veli palatini, medial pterygoid, lateral pterygoid, and temporalis all branch from…

A

mandibular nerve (V3)

Gross Anatomy III (19 decks)

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