Anatomy: Orbit Structures and Functions

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What is the main function of the lacrimal apparatus?

Supporting the eyeball in the orbit

Controlling eye movement

Regulating the size of the pupil

Producing tears to moisten and cleanse the eye (correct)

Where does the Inferior oblique muscle take its origin from?

Near the apex of the orbit

Floor anteromedially (correct)

Fixed to the roof anteromedially

Roof nearby

Which artery is responsible for supplying blood to the structures of the orbit?

Ophthalmic artery (correct)

External carotid artery

Facial artery

Internal jugular vein

What is the purpose of the orbital septum?

Separating the bony orbit from the soft tissues around it Signup and view all the answers

Which structure is NOT considered part of the contents of the orbit?

Trochlea Signup and view all the answers

What is the primary function of the nerves within the orbit?

Supplying sensory and motor functions to various structures in and around the eye Signup and view all the answers

What muscle elevates the upper eyelid?

Superior oblique Signup and view all the answers

Which nerve supplies the superior oblique muscle?

Trochlear nerve (CN IV) Signup and view all the answers

Which muscle adducts the eye?

Lateral rectus Signup and view all the answers

From which artery does the ophthalmic artery arise?

Optic artery Signup and view all the answers

How do oculomotor, asociliary, and abducent nerves enter the orbit?

Through SOF inside the ring Signup and view all the answers

What is the main function of the abducent nerve?

Supplying the lateral rectus muscle Signup and view all the answers

Which nerve supplies the lacrimal gland?

Lacrimal nerve Signup and view all the answers

What is the main function of the ciliary ganglion?

Being parasympathetic Signup and view all the answers

Which structure forms the anterior boundary of the conjunctival sac?

Orbital septum Signup and view all the answers

What is the function of the lacrimal puncta?

To drain tears into the lacrimal canaliculi Signup and view all the answers

Which artery supplies blood to the upper eyelid?

Supraorbital artery Signup and view all the answers