Infratemporal Fossa Flashcards
(27 cards)
Give the 5 boundaries of the infratemporal fossa
Anterior = posterior border of maxilla Posterior = tympanic plate AND mastoid process Superior = zygomatic arch Medial = lateral pterygoid plate Lateral = ramus of mandible
Give the muscular contents of the infratemporal fossa
inferior part of temporalis
medial pterygoid
lateral pterygoid
Give the neural contents of the infratemporal fossa
4 branches of CNV3 = auriculotemporal, inferior alveolar, lingual and buccal Chorda tympani (CNVII) Otic ganglion
Give the arterial contents of the infratemporal fossa
Maxillary artery and its branches
Give the venous contents of the infratemporal fossa
Pterygoid plexus
Compare and contrast the medial and lateral pterygoid muscles
Medial pterygoid (MP) closes jaw, Lateral pterygoid (LP) opens jaw
MP runs vertically, LP runs horizontally
MP has a deep and a superficial head, LP has an inferior and a superior head
BOTH innervated by V3
Origin of MP DH = medial surface of lateral pterygoid plate, MP SH = maxillary tuberosity
Origin of LP SH = infratemporal crest of greater wing of sphenoid, LP IH = lateral surface of lateral pterygoid plate
Insertion MP = medial surface of ramus, insertion LP = mandibular fovea, TMJ capsule and articular disc.
Give the clinical relevance of the pterygoid plexus
The pterygoid venous plexus is the communication between the superficial face and the dural venous sinuses
What is the 1st part of the maxillary artery, relative to the lateral pterygoid
before the lateral pterygoid
Give the 2 relevant branches of the 1st part of the maxillary artery and what they supply
The middle meningeal artery - cranial vault
Inferior alveolar artery - lower teeth
What is the 2nd part of the maxillary artery, relative to the lateral pterygoid
associated with the lateral pterygoid
Give the 2 relevant branches of the 2nd part of the maxillary artery, and what they supply
Buccal artery - cheek
Deep temporal arteries
What is the 3rd part of the maxillary artery, relative to the lateral pterygoid
After the lateral pterygoid
Give the 3 relevant branches of the 3rd part of the maxillary artery, and what they supply
sphenopalatine artery = nose/palate
infraorbital artery = upper teeth and skin of mid face
posterior superior alveolar artery = upper teeth
What is the name of the ganglion just superior to the foramen ovale?
the trigeminal sensory ganglion
What modality is the smaller root of CNV3?
smaller motor, larger sensory root
Where do the motor and sensory roots of CNV3 unite?
unite outside the cranial vault
How many divisions does CNV3 have and what are they?
2 - posterior division and anterior division
How many motor nerves and how many sensory nerves does the anterior division of CNV3 have?
2 motor nerve and 1 sensory nerve
Give the 3 nerves of the anterior division of V3, their modalities and what they innervate
Deep temporal = motor = temporalis
Buccal = sensory = mucosa and skin of cheek
Muscular branches = motor = masseter and lateral pterygoid
Give the 5 nerves of posterior division of V3, their modalities and what they innervate
Auricolutemporal = sensory = traguardo and posterior temple
Inferior alveolar = sensory = lower dental arch and mandibular labial gingivae
Nerve to mylohyoid = motor = mylohyoid and ABD
Mental Nerve = sensory = chin, lower lip mucosa, gingivae of lower 3-3
Lingual Nerve = sensory = anterior 2/3rd of tongue, floor of mouth, mandibular lingual gingivae
How many motor nerves and how many sensory nerves does the posterior division of CNV3 have?
4 sensory, 1 motor
What is the ganglion immediately inferior to the foramen ovale and on the medial surface of V3?
Otic ganglion
Give a description of the otic ganglion in terms of modality, functional association and what it innervates
Parasympathetic
Functionally associated with glossopharyngeal (CNIX)
Innervates the parotid gland for salivation
What is the chorda tympani?
the chorda tympani is a branch of the facial nerve that originates in the taste buds, travels through the middle ear, and carries taste messages to the brain.
(string + crosses eardrum)
