Cranial Nerves Cranial Nerve 1 Olfactory Nerve 2

Cranial Nerves

Cranial Nerve 1: Olfactory Nerve 2

Cranial Nerve II: Optic Nerve 3

Cranial Nerves III, IV, VI: Oculomotor, Trochlear, Abducens • • • Oculomotor Nucleus in midbrain Innervates 4 extraocular muscles and functions in most eye movements Contains parasympathetic which innervates pupillary constrictor muscles and ciliary muscle of lens. • • Trochlear Nucleus in midbrain Nerve exits dorsal surface and crosses over Moves eye medially and downward • • • Abducens Nucleus in pons Moves eye laterally

Oculomotor (III) Nerve 5

Oculomotor (III) Nerve

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Trochlear (IV) Nerve

Abducent (VI) Nerve

Cranial Nerve V: Trigeminal Nerve Trigeminal ganglion Ophthalmic, maxillary and mandibular divisions • Sensory: Touch, pain, temp, proprioception for face, oral and nasal cavities. • Motor: Muscles for mastication. 10

Cranial Nerve V: Trigeminal Nerve • V 1. Ophthalmic – Exits with eye muscle group (superior orbital fissure, through orbit to superior orbital notch/foramina) – Sensory to forehead, nasal cavity • V 2. Maxillary – Exits foramen rotundum through wall of maxillary sinus to inferior orbital foramina) – Sensory to cheek, upper lip, teeth, nasal cavity • V 3. Mandibular – – Exits foramen ovale to mandibular foramen to mental foramen Motor to jaw muscles-Masseter, temporalis, pterygoids, digastric Sensory to chin Taste Sensory to tongue (from facial N. ) 11

Ophthalmic (V 1) Nerve

Ophthalmic (V 1) Nerve 13

Ophthalmic (V 2) (nasal, palatine) Nerve

Ophthalmic (V 2) (sup. Alveolar)

Ophthalmic (V 2) (inf. orbital) 17

Ophthalmic (V 3) 18

Ophthalmic (V 3) 19

Cranial Nerve VII: Facial Nerve 1. Motor function: muscles of facial expression. 2. Parasympathetic function: innervation to lacrimal glands and some salivary gland. 3. Visceral sensory function: taste from anterior 2/3 of tongue 20

Cranial Nerve VII: Facial Nerve 21

Cranial Nerve VIII: Vestibulocochlear Nerve Auditory and vestibular sensation Travels with facial nerve Branches go to cochlea, vestibule 22

Vestibular and Cochlear Sensory Organs 23

Cranial Nerve X: Vagus Nerve Motor function: function pharyngeal muscles & laryngeal muscles Parasympathetic function: function heart, lungs, most if digestive tract. Somatic sensation function: function sensation from pharynx, meninges, external auditory meatus 24

Cranial Nerve IX: Glossopharyngeal Nerve Motor function: function stylopharyngeus muscle which elevates pharynx during talking and swallowing. Parasympathetic function: function innervation of parotid salivary gland. 25

Cranial Nerve XI: Spinal Accessory Nerve 26

Cranial Nerve XII: Hypoglossal Nerve 27

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