infratemporal fossa Flashcards
identify
infratemporal fossa
identify
zygomatic arch
identify
temporalis m.
identify
coronoid process of mandible
origin and insertion of temporalis m.
o: floor of temporal fossa; deep surface of temporal fascia
I: coronoid process
innervation and action of temporalis
N: mandibular nerve (CN V3)
A: elevate and retract mandible
Name this ligament
temporomandibular ligament: runs from temporal bone to neck of mandible
what is the action of the temporomandibular ligament
restricts posterior and lateral movement
Name and give action for the purple ligament
sphenomandibular ligament
Action: provides passive support
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
- superior cavity: protrusion/retrusion (gliding/translation)
- inferior cavity: hinge movement (depression/elevation)
What is the pin pointing to
Lingula of mandible
Identify
pterygomaxillary fissure
identify
mandibular fossa
identify red arrow
articular tubercle
red arrow
temporal surface of sphenoid bone
blue arrow
infratemporal surface of sphenoid bone
black arrow
lateral pterygoid plate
identify both
red: medial pterygoid plate of sphenoid
pin: lateral pterygoid plate of sphenoid
identify
forman spinosum
muscles of the infratemporal fossa are muscles of mastication. What nerve innervates these muscles?
motor supply from mandibular n. (CN V3)
identify
masseter m.
origin and insertion of masseter m
o: inferior border of zygomatic arch
i: lateral surface of ramus and angle of the mandible
Innervation and action of masseter m
N: mandibular n. (CN V3)
A: elevate and protrude mandible
identify
superior and inferior heads of lateral pterygoid muscle
Origin of lateral pterygoin
superior: infratemporal surface of the greater wing of sphenoid
inferior: lateral surface of lateral pterygoid plate
insertion of lateral pterygoid m.
superior: articular disc and capsule of TMJ
inferior: pterygoid fovea and capsule of TMJ
action of lateral pterygoid m.
protrude mandible and depress chin
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
identify
Superficial and deep head of medial pterygoid muscle
origin of medial pterygoid muscle
superior head: maxillary tuberosity
Deep head: medial surface of lateral pteryoid
Insertion of medial pterygoid m.
same for both superior and deep heads: medial surface of ramus of mandible
innervation and action of medial pterygoid m.
N: Mandibular n. (CN V3)
A: elevate and protrude mandible
Depression of the mandible is done by which 3 muscles
- gravity
- suprahyoid muscle
- infrahyoid muscle
- lateral pterygoid
Elevation of the mandible is done via which 3 muscles
- temporalis
- masseter
- medial pterygoid
Protrusion of mandible is done by which 3 muscles
- lateral pterygoid
- superficial masseter
- medial pterygoid
retraction of mandible is done by which muscles
- temporalis posterior fibers (prime)
- anterior belly of digastric
What artery is a branch off of the external carotid artery and can lie superfial or deep to the lateral pterygoid muscle?
maxillary artery
The maxillary artery can be split into 3 sections based on the position to what muscle?
Lateral pterygoid m.
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
The auricotemporal nerve is split by what artery?
middle meningeal artery
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
The maxillary vein connects to what venous plexus that lies in the infratemporal fossa
pterygoid plexus of veins
What nerve enters the infratemporal fosaa through the foramen ovale and carries both motor and sensory brances
mandibular nerve (CN V3)
The auriculotemporal nerve is a branch off of what nerve?
mandibular nerve (CN V3)
The auricotemporal nerve supplies what type of innervation
- sensory to TMJ
- parasympathetic postganglionics to parotid gland
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
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
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
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
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)
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
What type of innervation does chora tympani provide and to what structure
- preganglionic parasympathetics destined for submandibular ganglion
- taste for anterior 2/3 tongue
Name the two parts that make up the zygomatic arch
- zygomatic process of temporal bone
- temporal process of zygomatic bone
