Download Cranial Nerves

Cranial Nerves
• Inferior
surface of
the brain as
it appears
on gross
dissection.
The Olfactory nerve (I) – for sense of smell.
Nerves in nasal cavity synapse within olfactory
bulbs.
The Optic nerve (II) - carries visual
information.
The Oculomotor nerve (III) - Controls 4 of
the 6 extrinsic muscles of the eye.
The Trochlear nerve (IV)
– Innervates superior oblique eye muscle.
• The Trigeminal nerve
(V)
Largest of all the
cranial nerves
Has 3 Branches
1) Ophthalmic branch
skin, lacrimal gland
2) Maxillary branch
lower eyelid, upper
jaw
3) Mandibular branch
tongue, lower teeth
The Abducens nerve (VI)
Innervates lateral rectus muscle of eye (abduction!)
The Facial nerve (VII)
Controls muscles of scalp and facial expression.
Muscles of mastication and speech.
Pressure sensations from face.
Taste sensations from anterior 2/3 of
tongue.
The Facial nerve (VII)
The Vestibulocochlear nerve (VIII)
– Monitors sense of balance, position and
movement and also monitors hearing.
The Glossopharyngeal nerve
(IX)
Taste sensation
from posterior
1/3 tongue.
Controls swallowing
Detects O2 and CO2
content of blood
in carotid artery.
The Vagus nerve (X)
Vital to autonomic control of visceral
function
The Accessory nerve (XI)
– Internal branch
Innervates swallowing muscles.
– External branch
Controls sternocleidomastoid and trapezius.
The Hypoglossal nerve (XII)
Voluntary food mixing, swallowing and speech.
Control of tongue movements.
• The Accessory nerve (XI) and Hypoglossal nerve
(XII)
Olfactory Nerve (II)
Fig
18.6
FYI
Optic Nerve (II)
Oculomotor Nerve (III)
Trochlear Nerve (IV)
Abducens Nerve (VI)
Trigeminal Nerve (V)
Facial Nerve (VII)
Vestibulocochlear Nerve (VIII)
Glossopharyngeal Nerve (IX)
Vagus Nerve (X)
Accessory Nerve (XI)
Hypoglossal Nerve (XII)
Fig
18.17
FYI