Lecture 3 - Infratemporal Fossa

Question 1

bony boundaries

Answer 1

zygomatic arch
mandible ramus
condyle (TMJ)
lateral pterygoid plate (medial boundary)

Question 2

temporomandibular joint (TMJ)

Answer 2

synovial joints
-hyaline cartilage covers articular surfaces
-joint capsule (fibrous CT) connects bones
-synovial membrane line non-weighbearing surfaces
-articular disc dividing joint space
>disc divides joint space to upper and lower
movement
-hinge: elevation and depression
-gliding: protraction and retraction
-side to side: use muscles on alternating sides for grinding
dislocation
-movement of chondyle past the articular tubercle (keeps head of mandible from sliding too far forward when open)

Question 3

muscles of mastication

Answer 3

first branchial arch - innervated by CN V3
masseter - elevation and protraction
temporalis - elevation and retraction
lateral pterygoid - depression and protraction
medial pterygoid - elevation and protraction
- pterygoids also move mandible from side to side
- lesion cortical input to motor V3 = some weakness
- lesion motor V3 = loss of muscle function
- jaw deviates to weak side

Question 4

maxillary artery

Answer 4

goes through infratemporal fossa and runs through the pterygomaxillary fissure

Question 5

foramen ovale

Answer 5

middle meningeal artery goes through to supply the meninges

V3

Question 6

venous drainage

Answer 6

pterygoid plexus
-maxillary vein
-retromandibular vein
goes to ext. and int. jugular vein

Question 7

mandibular division of V3

Answer 7

starts in cranial cavity
trigeminal/semilunar ganglion
-V1 and V2 are sensory (ophthalmic and maxillary)
-V3 (mandibular) is motor, goes through foramen ovale

Question 8

Nerves of the infratemporal fossa

Answer 8

Sensory
-ariculotemporal *** also has parasymp (from 5->9 parotid)
-inf. alveolar
-lingual *** also has parasymp + taste for ant. 2/3 tongue
-temporal
-buccal
Motor
-inf alveolar
-N. mylohyoid (nerve): ant. belly digastric and mylohyoid
-temporalis 
-medial pterygoid 
-lateral pterygoid
-masseteric 
      - last four innervate muscles its named for
BOTH
-mental

Question 9

cranial parasympathetics

Answer 9

parotid gland

• innervated by preganglionic parasympathetics from CN 9 to the otic ganglion
• parasymp “hitckhike” with auriculotemporal nerve from V3

submandibular and sublingual glands

• chorda tympani nerve carries CN 7
• jumps to lingual nerve of CN 5
• synapse at submandibular ganglion and branch out