Infratemporal and Pterygopalatine Fossa

Question 1

Temperomandibular Joint Ligaments

Joint has disc, and is atypical synovial joint

Answer 1

Joint itself is from condylar part of the mandible and mandibular fossa of temporal bone

Lateral; sphenomandibular and stylomandibular ligaments hold

Question 2

TMJ movements and muscles involved

Answer 2

Protrusion: Lateral and medial pterygoid
Retraction: (Post) temporalis, deep masseter, geniohyoid and digastric

Elevation: temporalis, medial pterygoid, masseter
Depression: gravity, digastric, geniohyoid

Question 3

Muscles of mastication

Innervation

Answer 3

Temporalis; Masseter; pterygoid muscles (lateral- go to TMJ, and medial)

V3

Question 4

Infratemporal boundaries

Answer 4

Lateral: Ramus of mandible
Ant: Post border of maxill
Medial: Palatine muscles
Roof: Greater sphenoid wing and temporal bone

Question 5

Infratemporal fossa contents
Muscles
Ligamenst
Arterial
Neural
Venous

Answer 5

Pterygoid muscles
Sphenomandibular ligament
Maxillary artery branches: MMA (foramen spinosum)and Inferior alveolar
Neural: Posterior trunk V3 (foramen ovale) - Lingual nerve, Mental, inferior alveolar and auriculotemporal
Venous: Pterygoid plexus

Question 6

Chorda tympani and lesser petrosal nerves

Chorda tympani comes from middle ear, and joins ___ nerve (V3).
Lesser petrosal nerve joins______ nerve, run together with LPN with PS supply to ____. V3 runs with PS and S nerves

Answer 6

Chorda tympani comes from middle ear, and joins lingual nerve (V3).
Lesser petrosal nerve joins auriculotemporal nerve run together with LPN with PS supply to parotid. V3 runs with PS and S nerves

Question 7

Pterygopalatine fossa borders

Answer 7

Medial: Palatine bone
Ant: Maxilla
Roof: Sphenoid - foramen rotundum! (V2)

Question 8

What three entries in pterygopalatine fossa must we know

Answer 8

Foramen rotundum
Inferior orbital fissure
Sphenopalatine foramen (sphenopalatine artery, posterior epistaxis)

Question 9

Pterygopalatine fossa contents

Answer 9

Sphenopalatine artery
V2! (sensory only): Pterygopalatine/Hay fever ganglion
Greater petrosal (parasympathetic)
Sympathetic fibres coming of IC
Pterygoid plexus