Infratemporal Fossa Flashcards
What is the medial boundary of the ITS?
Lateral pterygoid plate
What is the anterior boundary of the ITS?
Posterior maxilla
What is the posterior boundary of the ITS?
tympanic plate and mastoid process
What is the superior boundary of the ITS?
Zygomatic arch
What is the lateral border of the ITS?
Border of the mandible
What muscles does the ITS contain?
- temporalis
- medial pterygoid
- lateral pterygoid
What nerves does the ITS contain?
- branches of CN V3
- chorda tympani (CN VII)
- otic ganglion (CN IV)
What arteries does the ITS contain?
maxillary artery and its branches
What veins does the ITS contain?
pterygoid plexus
What is the function of the lateral pterygoid muscle?
opens jaw
What innervates the lateral pterygoid muscle?
CN V3 (n. to lateral pterygoid)
What is the function of the medial pterygoid?
closes jaw
What innervates the medial pterygoid muscle?
CN V3 (n. to medial pterygoid)
What is the clinical relevance of the pterygoid venous plexus?
Communication between superficial face and dural venous sinuses.
How are the 3 segments of the maxillary artery differentiated?
Position in relation the lateral pterygoid muscle
What are the branches of the 1st part of the maxillary artery?
- middle meningeal artery
- IAA
What are the branches of the 2nd part of the maxillary artery?
- deep temporal arteries
- buccal artery
What are the branches of the 3rd part of the maxillary artery?
- sphenopalatine artery
- infra-orbital artery
- posterior superior alveolar artery
What divisions does the mandibular nerve split into?
anterior and posterior
What are 3 branches of the anterior division of the mandibular nerve?
- deep temporal
- buccal
- muscular branches
What are the branches of the posterior division of the mandibular nerve?
- auriculotemporal
- IAN
- lingual
What are the 2 branches of the IAN?
- nerve to mylohyoid
- mental
What does the lingual nerve supply?
- anterior 2/3rds of the tongue
- floor of the mouth
- mandibular lingual gingivae
What does the mental nerve supply?
- chin
- lower lip mucosa
- gingivae of lower 3-3
What does the IAN supply?
- lower dental arch
- mandibular labial gingivae
What nerve does the otic ganglion derive from?
Glossopharyngeal CN IX
Where is the otic ganglion?
On CN V3
What is the chorda tympani a chord of?
Trigeminal nerve (CN VII)
At what foramen does the chorda tympani branch?
at the stylomastoid foramen
What nerve does the chorda tympani connect with?
Lingual branch of CNV3
What does the chorda tympani innervate?
special sense of taste from anterior 2/3 tongue and palate through CN VII
