Sensory nerves (FINAL)

Trigeminal nerve

CN V

Formed by ophthalmic, maxillary, and mandibular

Ganglion

Clustering of cell bodies outside of CNS

Nucleus

Clustering of cell bodies inside CNS

Trigeminal ganglion

Branches of CNV enter

Relay station that connects to brainstem

Ophthalmic branch (V1)

Runs along lateral wall of cavernous sinus and enters orbit through superior orbital fissure

Receives sensory info from oculomotor, trochlear, and abducens

Ophthalmic branch divisions

Nasociliary, Frontal, Lacrimal nerves

Nasociliary nerve

Passes through oculomotor foramen and runs medially

Branches into long/short ciliary nerves, anterior/posterior ethmoid nerve, infratrochlear nerve

Rule of thumb for traveling through oculomotor foramen

Destination is within muscle cone → Pass through

Destination not within muscle cone → Pass above or below

Long ciliary nerves

Penetrate sclera at posterior apertures (same as long post ciliary arteries)

Receives sensory information from anterior half of globe

Short ciliary nerves

Pass through ciliary ganglion through the sensory root

Branch into choroid, posterior sclera, iris, CB, cornea

Mixed nerves (carry different types of nerve fibers)

Ciliary ganglion

Within muscle cone, contains 3 roots (sensory, parasympathetic, and sympathetic)

Only parasympathetic fibers will synapse

Anterior ethmoid nerve

Anterior and middle ethmoid sinus

Posterior ethmoid nerve

Posterior ethmoid and sphenoid sinus

Infratrochlear nerve

Runs near medial rectus below the trochlea and superior oblique

Branches to structures in medial canthal region

Frontal nerve

Passes through superior orbital fissure above Annulus of Zinn

Divides into supraorbital and supratrochlear nerves

Supraorbital nerve

Pass through supraorbital notch

Branch to structures in superior middle lid

Supratrochlear nerve

Above the trochlea

Branches to superior medial canthal region

Lacrimal nerve

Passes through superior orbital fissure and above Annulus of Zinn

Receives sensory info from superior lateral lid

Maxillary nerve

Pass through foramen rotundum above pterygopalatine fossa

Divides into infraorbital and zygomatic

Infraorbital nerve

Pass through inferior orbital fissure and infraorbital groove

Branches to inferior lid

Zygomatic nerve

Travels through inferior orbital fissure and exits through zygomatic foramen

Divides into zygomaticotemporal and zygomaticofacial

Branches to inferior lateral lid