Exam 3: Masseteric, Temporal and Infratemporal Regions

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Exam 3: Masseteric, Temporal and Infratemporal Regions
2012-07-04 16:25:42
anatomy masseteric temporal infratemporal

review of 7/3 lecture on masseteric, temporal, and infratemporal regions
Show Answers:

  1. Where is the masseteric region?
    side of head, inferior to zygomatic arch and lateral to the ramus of the mandible
  2. Where is the temporal region?
    on side of head above external auditory meatus and zygomatic arch
  3. What is included in the temporal region?
    temporal fossa
  4. What does the temporal fossa contain?
    temporalis muscle 
  5. How are the fibers of the temporal muscle oriented?
    both vertically and horizontally
  6. Where is the infratemporal region?
    lies inferior to temporal fossa and deep to ramus of mandible
  7. Infratemporal region
    Lateral wall: 
    ramus of mandible
  8. Infratemporal region
    Anterior wall: 
    body of maxilla
  9. Infratemporal region
    Medial wall: 
    lateral plat of pterygoid process
  10. Pterygopalatine fossa:
    triangular space medial to site where lateral plate of pterygoid process abuts on maxilla
  11. Pterygomaxillary fissure:
    opening into ptyergopalatine fossa from infratemporal fossa
  12. The pterygomaxillary fissure joins the what bony structure at a right angle?
    inferior orbital fissure
  13. What are the contents of the pterygopalatine fossa?
    • pterygopalatine ganglion
    • 3rd part of maxillary artery 
  14. How thick is the body of the maxilla?
    eggshell thickness
  15. Infratemporal region
    under surface of greater wing of sphenoid bone
  16. What is the shape of the roof of the infratemporal fossa?
  17. The roof of the infratemporal fossa is perforated by which foramen?
    • foramen ovale
    • foramen spinosum 
  18. What passes through the foramen ovale?
    mandibular branch of CN V
  19. What passes through the foramen spinosum?
    middle meningeal A
  20. What are the two parts of the masseteric region?
    superficial and deep
  21. What are the contents of the infratemporal fossa?
    • pterygoid muscles
    • maxillary artery
    • pterygoid plexus 
    • several nerves   
  22. What is the pterygoid plexus?
    a venous plexus
  23. What is the most medial structure in the infratemporal region?
    medial pterygoid muscle
  24. Where does the mandibular nerve enter the ifratemporal fossa?
    via foramen ovale
  25. How long is the undivided trunk of the mandibular nerve?
    2-3 mm in length
  26. What does the trunk of the mandibular nerve divide into?
    • anterior division
    • posterior division 
  27. Is the anterior division of the mandibular nerve motor or sensory?
  28. Is the posterior division of the mandibular nerve motor or sensory?
  29. What are the branches of the trunk of the mandibular nerve?
    • meningeal nerve
    • nerve to medial pterygoid muscle 
  30. What are the branches of the anterior division of the mandibular nerve?
    • masseteric
    • deep temporal
    • buccal
    • nerve to lateral pterygoid m.   
  31. Is the buccal branch of the anterior division of the mandibular nerve motor or sensory?
  32. What are the branches of the posterior division of the mandibular nerve?
    • auriculotemporal
    • lingual
    • inferior alveolar  
  33. How many parts is the maxillary artery divided into?
    3 parts
  34. Where do the branches of the 1st and 3rd parts of the maxillary artery pass through?
    bony canals
  35. Where do the branches of the 2nd part of the maxillary artery go?
    go to supply muscles of mastication and buccinator muscle
  36. Where do branches of the first part of the maxillary artery arise?
    as maxillary artery passes posterior to neck of mandible to travel anteromedially into infratemporal fossa
  37. What are the branches of the first part of the maxillary artery?
    • deep auricular
    • tympanic
    • middle meningeal
    • accessory meningeal
    • inferior alveolar   
  38. What does the deep auricular artery supply?
    external auditory meatus
  39. What does the typanic artery supply?
    typanic membrane
  40. What does the middle meningeal artery supply?
    dura of brain
  41. What does the accessory meningeal artery supply?
  42. What does the inferior alveolar artery supply?
    lower teeth
  43. What are the branches of the 2nd part of the maxillary artery?
    • masseteric
    • two deep temporal
    • pterygoid
    • buccal branches   
  44. What does the massteric artery supply?
    masseteric muscle
  45. What do the two deep temporal arteries supply?
    temporalis muscle
  46. What does the pterygoid artery supply?
    lateral pterygoid muscle
  47. What do the buccal branches supply?
    • buccinato muscle
    • mucous membrane deep to buccinator and skin of cheek  
  48. After the maxillary gives off branches to mm of mastication it leaves the infratemporal fossa by passing through what?
    pterygomaxillary fissure
  49. After the maxillary artery passes through the pterygomaxillary fissure, where does it go?
    pterygopalatine fossa
  50. Veins corresponding to branches of maxillary artery form what plexus?
    pterygoid plexus
  51. Where are the pterygoid plexus?
    around the pterygoid muscles
  52. The pterygoid plexus has important connections with which veins?
    • 1. cavernous sinus
    • 2. facial vein
    • 3. pharyngeal plexus of veins
  53. What does the pteryogoid plexus pass through to connect with the cavernous sinus?
    foramen ovale
  54. What connects the pterygoid plexus with the facial vein?
    the deep facial vein
  55. Where does the pterygoid plexus end?
    maxillary vein
  56. The maxillary vein follows which artery deep to the neck of the mandible?
    maxillary artery
  57. The maxillary vein joins with what vein?
    superficial temporal vein
  58. When the maxillary vein joins with the superficial temporal vein, it forms what?
    retromandibular vein
  59. Why might an abcess tooth become dangerous if infected?
    because of the pterygoid plexus connecting with the cavernous sinus
  60. Otic ganglion:
    parasympathetic ganglion
  61. The otic ganglion is an important relay station for the preganglionic parasympathetic fibers of which nerve?
    glossopharyngeal nerve (CN IX)
  62. The otic ganglion has preganglionic parasympathetic fibers of the glossopharyngeal nerve which are destined for what?
    the parotid gland
  63. Where does the lesser petrosal nerve descend?
    through foramen ovale
  64. When the lesser petrosal nerve descends through the foramen ovale it brings what kind of fibers to the otic ganglion?
    preganglionic fibers
  65. The postganglionic fibers of the lesser petrosal nerve travel with which other nerve to the parotid gland?
    auriculotemporal nerve
  66. What are the bony parts of the temporomadnibular joint (TMJ)?
    • head of mandible
    • articular surface of mandibular fossa
    • articular tubercle of temporal bone  
  67. What caps the head of the mandible and projects forward under the articular tubercle in the TMJ?
    articular disc
  68. What does the articular disc of the TMJ do?
    divide joint cavity into upper and lower compartments
  69. What is the articular disc firmly fixed to?
    medal and lateral ends of condyle
  70. Wha tendon is partly inserted into the articular disc's anterior margin?
    tendon of lateral pterygoid
  71. The articular disc implies two types of movement where?
    one on each side of the disc
  72. What movements occur in the lower joint cavity?
    simple hinge movements between head and disc
  73. What do hinge movements between head and disc permit?
    depression and elevation of mandible
  74. In the upper joint cavity, the disc and head of the TMJ do what types of movements?
    glide together on articular tubercle
  75. The disc and head of the TMJ glide together on articular tubercle permit what?
    protrusion and retraction of mandible
  76. What ligaments are external to the joint capsule?
    • lateral temporomandibular ligament
    • stylomandibular ligament
    • sphenomandibular ligament  
  77. The thickened joint capsule is at which ligament?
    lateral temporomandibular ligament
  78. What is mandibular elevation?
    close the jaw
  79. What is depression of the mandible?
    drop jaw/open widely
  80. What are lateral movements of the mandible?
  81. What is protrusion of the mandible?
    anterior movement
  82. Besides muscles, what accomplishes depression of mandible?
  83. Which muscles allow mandibular elevation?
    • temporalis
    • masseter
    • medial pterygoid mm 
  84. What allows depression of mandible?
    • gravity
    • anterior belly of digastric
    • mylohyoid
    • lateral pterygoid mm   
  85. What allows lateral movements of mandible?
    • ispsilateral temporalis and masseter
    • contralateral medial pterygoid  
  86. What performs protrusion of the mandible?
    lateral pterygoid
  87. What allows retraction of the mandible?