Flashcards in 03c: Infratemporal Fossa Deck (40):
Major borders of temporal fossa.
Medial: Pterion (frontal, parietal, temporal, greater wing sphenoid)
Lateral: Zygomatic arch
Temporal fossa contents.
Temporalis and supplying neurovasculature
Lateral border of infra temporal fossa.
Ramus of mandible
Medial border of infra temporal fossa.
Lateral pterygoid plate
Anterior border of infra temporal fossa.
Posterior border of infra temporal fossa.
1. Styloid and mastoid processes
2. Tympanic plate
Superior border of infra temporal fossa.
Inferior surface of greater wing sphenoid
Musculoskeletal structures in infratemporal fossa.
1. Medial and lateral pterygoid
Nerves in infratemporal fossa
1. Most V3 branches
2. Chorda tympani (CN VII branch)
3. Otic ganglion
Vasculature in infratemporal fossa.
Majority of maxillary artery
Which key landmark separates that divisions of maxillary artery? List each division and its relationship to that landmark.
Lateral pterygoid muscle;
1. Mandibular (lateral)
2. Pterygoid (along/superficial)
3. Pterygopalatine (medial)
List branches off maxillary artery in first, (X), division.
X = mandibular
1. Anterior tympanic
2. Middle meningeal
3. Inferior alveolar
Anterior tympanic artery supplies:
Which maxillary artery branch is often site of bleeding in (X) hematomas?
X = epidural;
Inferior alveolar artery travels into/through (X) and with (Y).
X = mandible;
Y = inferior alveolar nerve (V3)
Second, (X), division of maxillary artery supplies:
X = pterygoid
1. Masseter and temporalis
2. Pterygoid muscles
Which division(s), if any, of maxillary artery course through pterygopalatine fossa?
List branches off maxillary artery in third, (X), division. Star the ones give off in (Y), before it passes through (Z).
X = pterygopalatine
Y = infratemporal fossa
Z = pterygomaxillary fissure
1. Posterior superior alveolar*
3. Descending palatine
6. Artery of pterygoid canal
Territory supplied by maxillary artery is drained by (X). Anteriorly, (X) drains into (Y) via (Z).
X = pterygoid plexus of veins
Y = facial vein
Z = deep facial vein
Territory supplied by maxillary artery is drained by (X). Superiorly, (X) drains into (Y) via (Z).
X = pterygoid plexus of veins
Y = cavernous sinus or orbit
Z = emissary veins or inferior opthalmic vein
Pterygoid plexus of veins is significant potential connection between:
External face and intracranial dural venous sinuses
Muscles involved in protrusion of jaw.
1. Lateral pterygoid
2. Medial pterygoid (assists)
Muscles involved in elevation of jaw.
1. Temporalis and masseter
2. Medial pterygoid
Muscles involved in retraction of jaw.
1. Posterior temporalis
2. Deep part of masseter
3. Geniohyoid and digastric
Muscles involved in depression of jaw.
Sphenomandibular ligament is on (X) surface of mandible and connects to which processes?
X = medial
Spine of sphenoid and lingula of mandible
Stylomandibular ligament is on (X) surface of mandible and connects to which processes?
X = medial
Styloid process and angle of mandible
Gently opening mouth. What motions at R and L TMJ?
Rotation of R andL mandible heads in mandibular fossae
Widely opening mouth. What motions at R and L TMJ?
Heads of mandibles and articular discs move anteriorly until positioned under articular tubercle; mandible depressed
Protrusion/retraction of jaw. What motions at R and L TMJ?
Heads of mandibles and articular discs move anteriorly until positioned under articular tubercle; mandible NOT depressed/elevated
Chin moved laterally to right. What motions at R and L TMJ?
R: pivoting and retraction
L: sliding anteriorly (protraction)
Which muscle is the primary retractor of mandible?
(X) muscle is the mirror image of masseter.
X = medial pterygoid
(X) mastication muscles close jaw and (Y) mastication muscles open jaw.
X = 3 (masseter, temporalis, medial pterygoid)
Y = 1 (lateral pterygoid)
Which muscle of mastication attaches to (X) of TMJ?
X = joint capsule and disc
Superior head of lateral pterygoid
T/F: Most of the TMJ has no sensory innervation.
False - disc doesn't but rest of joint is highly sensitive
TMJ sensory fibers primarily travel in branches of (X) nerves, which are collectively part of (Y) nerve.
X = Auriculotemporal, masseteric
Y = mandibular division of CN V
Unilateral contraction of lateral pterygoid will cause jaw to:
Swing to contralateral side
Muscles of mastication propioceptive awareness (to control force of bite) is carried by afferent fibers from (X) structures to (Y).
X = muscle spindles
Y = Mesencephalic Nucleus of V