Week 9 Human Anatomy

Label the Trigeminal divisions

V1- Ophthalmic

V2- Maxillary

V3- Mandibular

CN I

Olfactory

*Sensory Only

Origin- Olfactory epithelium

Enters cranial cavity with- ciribrum foramina

CN II

Optic

*Sensory only

Origin- retina of eye, connects to brain w thalmus

Enters at optic canal

Optic Chiasm- nerve fibers crossing

CN III

Oculomotor

Origin- anterior midbrain

*Motor only- superior/inferior/medial rectus, medial oblique

CN IV

Trochlear

Origin- posterior midbrain

*Motor only- superior oblique

Exits via superior orbital fissure of the sphenoid

CN V

Trigeminal

CN VI

abducens

Origin- between pons + midbrain

*Motor only- lateral rectus

Exits via superior orbital fissure of the sphenoid

CN VII

Facial

Origin- lateral pons, at junctions with medulla

Somatic- Muscles of facial expressions

Visceral- lacrimal and submandibular/sublingual glands- parasympathetic

Sensory- taste w anterior/front 2/3 of tongue; via chorda tympani branch

CN VIII

Vestibulocochlear

*Sensory only- hearing + balance

Origin- inner ear, connects to brain stem at pons

*Fibers from cochlea + semicircular canals enter 

cranial cavity vis internal auditory meatus

CN IX

Glossopharyngeal

CN X

Vagus

CN XI

Spinal Accessory

CN XII

Hypoglossal

What are the ear occicles

Malleus

Incus

Stapes