Muscles of orbit

From Freepedia

There are seven muscles of the orbit; one controls the movement of the upper eyelid, and six others control the movement of the eye.

Muscle	Innervation	Primary function	Secondary function	Tertiary function
Levator palpebrae superioris	Oculomotor nerve	Elevation of the superior (upper) eyelid	.	.
Superior rectus	Oculomotor nerve	Elevation	Intorsion	Adduction
Inferior rectus	Oculomotor nerve	Depression	Extorsion	Adduction
Lateral rectus	Abducens nerve	Abduction	.	.
Medial rectus	Oculomotor nerve	Adduction	.	.
Superior oblique	Trochlear nerve	Intorsion	Depression	Abduction
Inferior oblique	Oculomotor nerve	Extorsion	Elevation	Abduction

A good mnemonic to remember which muscles are innervated by what nerve is to paraphrase it as a molecular equation: LR₆SO₄R₃.
Lateral Rectus - Cranial Nerve VI,
Superior Orbital - Cranial Nerve IV,
the Rest of the muscles - Cranial Nerve III.

Another way to remember which nerves innervate which muscles is to understand the meaning behind all of the Latin words. The fourth cranial nerve, the trochlear, is so named because the muscle it innervates, the superior oblique, runs through a little fascial pulley that changes its direction of pull. This pulley exists in the superiomedial corner of each orbit, and "trochl-" is Latin for "pulley." The sixth cranial nerve, the abducens, is so named because it controls the lateral rectus, which abducts the eye (rotates it laterally) upon contraction. All of the other muscles are controlled by the third cranial nerve, the oculomotor, which is so named because it is in charge of the movement (motor) of the eye (oculo-).

Muscles of orbit

Levator palpebrae superioris muscle - Superior rectus muscle - Inferior rectus muscle - Lateral rectus muscle - Medial rectus muscle - Superior oblique muscle - Inferior oblique muscle

Muscles of the head

facial expression: Auricularis anterior muscle - Buccinator muscle - Corrugator supercilii muscle - Depressor anguli oris muscle - Depressor labii inferioris muscle - Depressor septi nasi muscle - Frontalis muscle - Levator anguli oris muscle - Levator labii supeioris muscle - Levator labii superioris alaeque nasi muscle - Levator palpebrae superioris muscle - Mentalis muscle - Nasalis muscle - Occipitalis muscle - Orbicularis oculi muscle - Orbicularis oris muscle - Platysma - Procerus muscle - Risorius muscle - Zygomaticus major muscle - Zygomaticus minor muscle