Deep Face And Infratemporal Fossa Flashcards
Temporal fossa is the space superior to the ____.
Infratemporal fossa is the space inferior to the ____.
Zygomatic arch
Zygomatic arch
What are he boundaries of the infratemporal fossa?
Lateral: ramus of mandible
Anterior: maxilla
Medial: lateral pterygoid plate
Roof: sphenoid
Posterior: tympanic plate and mastoid and styloid process
Inferior: angle of mandible
What are the four muscles of mastication?
Innervated by what?
Medial pterygoid m
Lateral pterygoid m
Masseter m
Temporalis m
Trigeminal N V3
What are the contents of the infratemporal fossa?
Inferior potion of temporalis m
Lateral and medial pterygoid m
Maxillary A
Pterygoid venous plexus
Inferior alveolar N (V3) Lingual N (V3) Buccal N (V3) Chorda tympani (CN VII) Otic ganglion
When you yawn, the ____ muscle contracts, expands, and pushes on pterygoid venous plexus to stimulate blood flow.
Lateral pterygoid m
Where do the mandibular branches off the maxillary A go, what do they supply?
Deep auricular A
Anterior tympanic A
Inferior alveolar A
Middle meningeal A
Accessory meningeal A
External acoustic meatus; external TM, TMJ
Internal TM
Enters mandibular foramen and supplies mandible, mandibular teeth, chin, and mylohyoid m
Enters cranium via foramen spinosum, supplies dura mater of lateral wall, trigeminal ganglion, facial N, geniculate ganglion, tympanic cavity, tensor tympani m
Enters cranium via foramen ovale and supplies extracranial muscles of infratemporal fossa, otic ganglion, and sphenoid bone
What do the pterygoid branches off the maxillary A supply?
Masseteric A
Pterygoid branches
Deep temporal A
Buccal A
TMJ, masseter m
Pterygoid m
Temporalis m
Buccal fat pad, buccinator, buccal and oral mucosa
What are five sensory branches off of V3?
Buccal
Lingual
Inferior alveolar: dental, incisive, mental
Auriculotemporal: anterior auricular, external acoustic meatus, temporomandibular joint, superficial temporal
Meningeal: anterior cranial fossa, middle cranial fossa
What are five motor branches off of V3?
Medial pterygoid: tensor veli palatini, tensor tympani
Lateral pterygoid
Masseteric
Deep temporal
Mylohyoid: N to mylohyoid, N to anterior digastric
What are six sensory branches of V2?
Zygomatic Infraorbital Superior alveolar Nasociliary Palatine Meningeal
What is the fx of the sphenomandubular L?
____ ligament also limits the inferior excursion at the TMJ. What arch is it from?
Prevents dislocation of the mandible
Stylomandibular L; Brachial arch 1
What is the origin, insertion, innervation, and action of the masseter m?
Zygomatic bone
Mandibular angle and ramus
Masseteric N (V3)
Elevates mandible, assists in protraction, retraction, side to side motion, closes jaw*
What is the origin, insertion, innervation, and action of the temporalis m?
Temporal fossa/fascia
Coronoid process of mandible
Deep temporal N (V3)
Elevate mandible, retract mandible, lateral movement
The _____ is the only opener of the jaw. The other muscles of mastication close the jaw.
Lateral pterygoid m
_____ innervates buccinator m and orbicularis oris m, which assist in mastication.
Facial N
What is the origin, insertion, innervation, and action of the lateral pterygoid m?
Greater wing of sphenoid bone; lateral pterygoid plate
Mandible, TMJ
Lateral pterygoid N (V3)
Protrudes mandible, opens mouth, side to side movement
What is the origin, insertion, innervation, and action of the medial pterygoid m?
Maxilla, palatine bone, medial surface of lateral pterygoid plate, pterygoid fossa
Pterygoid rugosity on mandibular angle
Medial pterygoid N (V3)
Elevates mandible, protrusion of mandible, medial movement toward opposite side, side to side, closes jaw
_____ muscles fix the hyoid in place so the ____ muscles can help open the mandible.
What are the four infrahyoid muscles fixing the hyoid?
What are the four suprahyoid muscles assisting in opening the jaw?
Infrahyoid
Suprahyoid
Sternohyoid, sternothyroid, thyrohyoid, omohyoid
Digastric (V3, CN VII), geniohyoid (C1), mylohyoid (V3), stylohyoid (CN VII)
Name the muscle with the movement of the mandible:
Elevation
Depression
Protrusion
Retrusion
Lateral movements
Temporalis, masseter, medial pterygoid
Lateral pterygoid, suprahyoid and infrahyoid muscles
Lateral pterygoid, masseter, medial pterygoid
Temporalis, masseter
Ipsilateral temporalis and masseter, contralateral pterygoids
The TMJ join is a ____ with a ____ disc. ____ muscle attaches to this disc.
This joint can become ____.
Synovial joint (with synovial fluid and membrane)
Articular disc
Lateral pterygoid m
Arthritic
____ 15 degrees, the TMJ stays in the same place and rotates the glenoid.
____ 15 degrees the TMJ dislocates and drops onto the anterior process. The articular disc slides with the joint, pulled by the ____. Dysfunction when the superior head of this muscle is not working.
Less than
Greater than
Lateral pterygoid m
Sensation to the TMJ is done by _____ nerves.
Auriculotemporal N (V3)
Posterior deep temporal N (V3)
Masseteric N (V3)
Posterior dislocation of the TMJ is hard because it runs into the ___.
Anterior dislocation is common; the TMJ pops forward into the _____.
Tympanic plate
Infratemporal fossa
How do you anesthetize the bottom teeth?
How do you anesthetize the top teeth?
Inject above bottom 3rd molar to block inferior alveolar N
Inject above top 2nd molar, 2nd premolar, and incisive foramen to block superior alveolar N; also can block superior labial N (supplying the gum)
