Here is a neat little song  to learn the 12 cranial nerves and basic functions (sung to the tune of 12 Days of Christmas). 

For a comprehensive list of fun mnemonics to learn the cranial nerves, check out Cranial Nervonics!

THE TWELVE CRANIAL NERVES

I (Olfactory)

On the first nerve of the cranium,

my true love gave to me:

My sense olfactory.

II (Optic)

On the second nerve of the cranium,

my true love gave to me:

Two, eyes a-looking,

And my sense olfactory. 

III (Oculomotor)

On the third nerve of the cranium,

my true love gave to me:

Three cross-eyed glances,

Two, eyes a-looking,

And my sense olfactory. 

IV (Trochlear)

On the fourth nerve of the cranium,

my true love gave to me:

Four: superior oblique muscles,

Three cross-eyed glances,

Two, eyes a-looking,

And my sense olfactory. 

V (Trigeminal)

On the fifth nerve of the cranium,

my true love gave to me:

Mas-ti-ca-tion!

Four: superior oblique,

Three cross-eyed glances,

Two, eyes a-looking,

And my sense olfactory.

VI (Abducens)

On the sixth nerve of the cranium,

my true love gave to me:

Six sideways glances,

Mas-ti-ca-tion!

Four; superior oblique,

Three cross-eyed glances,

Two eyes a-looking,

And my sense olfactory.

VII (Facial)

On the seventh nerve of the cranium,

my true love gave to me:

Seven funny faces,

Six sideways glances,

Mas-ti-ca-tion!

Four; superior oblique,

Three cross-eyed glances,

Two eyes a-looking,

And my sense olfactory.

VIII (Vestibulocochlear)

On the eighth nerve of the cranium,

my true love gave to me:

Eight sounds, and balance,

Seven funny faces,

Six sideways glances,

Mas-ti-ca-tion!

Four; superior oblique,

Three cross-eyed glances,

Two eyes a-looking,

And my sense olfactory. 

IX (Glossopharyngeal)

On the ninth nerve of the cranium,

my true love gave to me:

Nine quick swallows,

Eight sounds, and balance,

Seven funny faces,

Six sideways glances,

Mas-ti-ca-tion!

Four; superior oblique,

Three cross-eyed glances,

Two eyes a-looking,

And my sense olfactory.

X (Vagus)

On the tenth nerve, the vagus,

my true love gave to me:

Ten heart beats a minute,

Nine quick swallows,

Eight sounds, and balance,

Seven funny faces,

Six sideways glances,

Mas-ti-ca-tion!

Four; superior oblique,

Three cross-eyed glances,

Two eyes a-looking,

And my sense olfactory.

XI (Accessory)

On the eleventh nerve of the cranium,

my true love gave to me:

Eleven heads a-tilting,

Ten heart beats a minute,

Nine quick swallows,

Eight sounds, and balance,

Seven funny faces,

Six sideways glances,

Mas-ti-ca-tion!

Four; superior oblique,

Three cross-eyed glances,

Two eyes a-looking,

And my sense olfactory.

XII (Hypoglossal)

On the twelfth nerve of the cranium,

my true love gave to me:

Twelve lovely lickings,

Eleven head’s a-bobbing,

Ten - take it slowly,

Nine, deep throating,

Eight, hear her panting,

Seven, smile with pleasure,

Six look for condoms,

Mas-ti-ca-tion! (Don’t bite!)

Four, look to heaven,

Three, roll your eyes,

Two (you’ve seen it coming)

Can have fun with a-na-to-my!

from: http://allnurses.com/