Points of exit from cranial cavity

V1, V2, V3

Opthalmic Division V1: Superior orbital fissure

Maxillary division V2: Foramen rotundum 

Mandibular division V3: Foramen ovale

Trigeminal divisions deep cavity innervation

V1,V2,V3

V1: Orbit

V2: Pterygopalatine fossa

V3: Infratemporal fossa

Some branches continue to supply superficial skin

Sensory Distribution and branches  

V1

-skin of forehead and upper eyelid

 -orbit

-mucous membranes of nose and paranasal sinuses

Branches: supraorbital, supratrochlear, lacrimal laterally,infratrochear, external nasal 

Sensory distribution and branches 

V2

-skin of lower eyelid, nose, upper lip

-maxillary teeth and gingiva 

-mucous membrane of palate

-mucous membrane of nose and paranasal sinuses 

-Branches: palatine nn., PSA n., MSA n, ASA n, infraorbital n, zygomatic n

Sensory distribution and branches

V3

-skin of lower lip and chin

-mandibular teeth and gingiva

-tongue

-cheek

-TMJ 

Branches: Meningeal branch, auriculotemporal n, n. to mylohyoid, lingual n, Inferior alveolar n, mental n, buccal n nn. to pterygoids, n to masseter, n to temporalis 

-Masseter

-Temporalis

-lateral pterygoid

-medial pterygoid

-mylohyoid

-ant. belly of digastric

-tensor tympani 

-tenso veli palatini