Infratemporal Fossa and Oral Cavity Flashcards Preview

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Flashcards in Infratemporal Fossa and Oral Cavity Deck (35):
1

Osteological features of Sphenoid Bone

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2

Osteology of Mandible 

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3

Inside Osteology of Mandible

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4

Contents of Infratemporal Fossa

  • Muscles of Mastication
  • Otic ganglion
  • Temporomandibular Joint
  • Maxillary Artery
  • Pterygoid plexus of veins
  • Branches of V3
  • Otic ganglion
  • Chorda Tympani - from CN VII

5

What arch are all muscles of mastication associated with?

  • 1st Pharyngeal Arch 

6

All Muscles of mastication are motor supplied by what nerve?

V3

7

Masseter Function 

  • Elevtates Mandible  (if both contracted)
  • Ipsilateral excursion (if one contracted)

8

Temporalis 

  • Elevates mandible 
  • posterior fibers RETRACT mandible
  • ipsilateral excursion if one side contracting  

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9

Medial Pterygoid 

  • Elevates Mandible
  • One side contracting = contralateral excursion 

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10

Lateral Pterygoid

  • Both sides contracting - protrusion of mandible
  • One side contracting - contralateral excursion 

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11

Temporomandibular Joint 

  • Bony Features
    • Mandibular fossa
    • Articular eminence of temporal bone
    • Condyle of Mandible
  • Synovial Joint
    • Articular cartilage
    • Capsule
    • Intra-articular disc

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12

Articular Disc

  • Attached to cricumfrence to joint capsule 
  • assures dic and condyle move together

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13

Movement at TMJ

  • Sliding translation
  • Hinge
  • Lateral Excursion 

14

Actions and Muscles when opening mouth

  • Suprahyoid muscles initiate motion (depression of mandible, lower joint space)
  • must protrude mouth to open
    • Condyle and disc must slide anteriorly into articular eminence 
    • Lateral pterygoids - prime mover

15

Actions and muscles when closing mouth

  • Elevation and retraction of mandible
    • Masseter
    • medial pterygoid 
    • temporalis

16

Maxillary Artery

  • Terminal branch of external carotid
  • passes through infratemporal fossa and into pterygopalatine fossa
  • supplies
    • teeth
    • nasal cavity
    • muscles of mastication
    • bones
    • midface
  • main artery of deep facial structures 

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17

Middle Meningeal Artery

  • Branch of Maxillary artery
  • Auricotemporal comes off of it
  • enters middle crania fossa via foramen spinosum 
  • located at pterion (wings) of head...vulnerable to damage to skull fractures
     

18

Pterygoid Plexus of Veins connect to which veins?

  • Surface of pterygoid muscles 
  • Connections to
    • Facial veins
    • Maxillary veins
    • Jugular veins
    • Deep connections to Cavernous Sinus
  •  

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19

Cavernous Sinus Thrombosis

  • Connections between cavernous sinus and
    • Facial veins
    • Pterygoid veins
    • Ophthalmic veins
  • Infections in face/dental region can travel to cavernous sinus/brain 

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20

Muscles of mastication all innervated by what motor nerves?

  • Branchial motor fibers from V3
  • also supply branchial motor to all muscles from 1st pharyngeal arch 

21

Motor innervation of muscles of mastication 

  • Branchial motors from V3
    • also supply all other muscles from 1st pharyngeal arch 

22

Sensory Innervation in face area

  • Auricotemporal Nerve of V3
    • sensory from side of face
    • carries parasympathetic from CN IX from Otic Ganglion  to Parotid Gland 
  • Buccal Nerve of V3
    • Sensory cheek from cheek
  • Lingual of V3
    • General sensory to anterior 2/3
    • joined by Chorda Tympani

 

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23

24

Sensory Branch to mandible - Inferior Alverolar nerve 

  • General sensation from teeth
  • passes through mandibular foramen 
  • Nerve of mylohyoid splits off from it
  • ends in mental nerve after going through mental foramen

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25

Where is Parotid papilla located?

  • in Oral Vestibule
  • opposite 2nd maxillary molar

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26

Mylohyoid muscle

  • Originates on mylohyoid line of the mandible
  • Inserts into hyoid bone
  • Action: elevates hyoid and floor of mouth 
  • depresses mandible

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27

Submandibular & Sublingual Salivary Glands

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28

Where does submandibular duct empty into?

  • Sublingual caruncle (papilla)

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29

Innervation of Salivary Glands

  • Parasympathetics of VII travel with Chorda Tympani
    • C. Tympani hitchikes on lingual nerve (V3)
    • synapse occurs in submandibular ganglion
    • post synaptics travel to submandibular/sublingual glands 

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30

What types of fibers does chorda tympani carry?

  • Parasympathetic (to salivary/submandibular glands from VII)
  • Special Sensory (Taste) 
  • Hitchikes on lingual nerve of V3 to enter oral cavity 

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31

Terminal Sulcus

  • seperates Anterior 2/3 from posterior 1/3
  • V shaped groove
  • foramen cecum at apex 
  • origin of thyroglossal duct

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32

Lingual Papillae

  • associated with taste buds
  • anterior 2/3 

33

Extrinsic muslces of Tongue

  1. Hyoglossus - depresses tongue 
  2. Styloglossus - retracts tongue
  3. Genioglossus - protrudes tongue 

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34

What supplies motor innervation to all tongue muscles?

  • Hypoglossal Nerve (CN XII)

35

what do taste fibers from VII, IX, X travel through to get to brainstem?

  • Solitary tract nucleus 

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