1. Inferior surface of the brain as it appears on gross dissection.

3. The Olfactory nerve (I) – for sense of smell.
Sensory
Nerves in nasal cavity synapse within olfactory bulbs.
Anosmia – loss of smell.

4. The Optic nerve (II) - visual information.
Sensory
50-50 cross over
Anopsias – visual defects.

5. 6 Extrinsic Eye Muscles 4 Rectus Muscles 2 Oblique Muscles Nose here

6. The Oculomotor nerve (III) - Controls 4 of
the 6 extrinsic muscles of the eye.
Motor
External Strabismus – lateral drift.
Ptosis.
The Trochlear nerve (IV)
Innervates superior oblique eye muscle.
Motor

7. The Trigeminal nerve (V)
Mixed
Largest cranial nerve
Has 3 Branches
1) Ophthalmic branch
skin, lacrimal gland
2) Maxillary branch
lower eyelid, upper jaw
3) Mandibular branch
tongue, lower teeth
e.g., Tic Douloureux.

8. The Abducens nerve (VI)
Innervates lateral rectus muscle of eye (abduction!)
Motor
Internal Strabismus – cross eyed.
The Facial nerve (VII)
Controls muscles of scalp and facial expression.
Muscles of mastication and speech.
Mixed
Pressure sensations from face.
Taste sensations from anterior 2/3 of tongue.
e.g., Bell’s palsy.

9. The Facial nerve (VII)
Mixed

10. The Vestibulocochlear nerve (VIII)
Sensory
Sense of balance, position and body movement.
Loss of balance, nausea, vomiting.
Sense of sound (hearing).
Deafness.

11. The Glossopharyngeal nerve (IX)
Mixed
Taste sensation
from posterior
1/3 tongue.
Controls swallowing
Detects O2 and CO2
content of blood
in carotid artery.
Impairment of taste and swallowing.

12. The Vagus nerve (X) Vital to autonomic control of visceral function
Mixed
Controls
vocal folds
Hoarseness
of voice.
Regulates
heart
Controls
G.I. Tract
Impaired
regulation
of heart.
Impaired
G.I. tract
motility.
Vital to autonomic control of visceral function

13. The Accessory nerve (XI)
Internal branch
Innervates swallowing muscles.
Motor
External branch
Controls sternocleidomastoid and trapezius.
Turn toward injured side.
Impaired shrugging.
The Hypoglossal nerve (XII)
Voluntary food mixing, swallowing and speech.
Control of tongue movements.
Motor
Impaired swallowing.
Deviating tongue (atrophy).

14. The Accessory nerve (XI) and Hypoglossal nerve (XII)