Download Cranial Nerves

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
7
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
• V1. Ophthalmic
– Exits with eye muscle group (superior orbital fissure, through orbit to
superior orbital notch/foramina)
– Sensory to forehead, nasal cavity
• V2. Maxillary
– Exits foramen rotundum through wall of maxillary sinus to inferior orbital
foramina)
– Sensory to cheek, upper lip, teeth, nasal cavity
• V3. 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 (V1)
Nerve
Ophthalmic (V1)
Nerve
13
Ophthalmic (V2) (nasal, palatine)
Nerve
Ophthalmic (V2) (sup. Alveolar)
Ophthalmic (V2) (inf. orbital)
17
Ophthalmic (V3)
18
Ophthalmic (V3)
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:
pharyngeal muscles & laryngeal
muscles
Parasympathetic function: heart,
lungs, most if digestive tract.
Somatic sensation function:
sensation from pharynx,
meninges, external auditory
meatus
24
Cranial Nerve IX: Glossopharyngeal Nerve
Motor function: stylopharyngeus muscle which elevates pharynx during
talking and swallowing.
Parasympathetic function: innervation of parotid salivary gland.
25
Cranial Nerve XI: Spinal Accessory Nerve
26
Cranial Nerve XII: Hypoglossal Nerve
27
28