Anatomy of the Orbit

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What is the main function of the pyramidal structure known as the orbit?

Separating the upper and lower facial skeletons

Aiding in respiratory functions

Ensuring proper jaw movement

Protecting the brain and optic nerve from direct force (correct)

What important structures pass through the notch in the medial third of the superior orbital rim?

Orbital septum

Nasolacrimal duct

Supraorbital nerve, artery, and vein (correct)

Infraorbital nerve

What is the function of the lateral orbital rim being projected the least?

Facilitating lateral vision (correct)

Supporting jaw movement

Protecting the lacrimal gland

Enhancing central vision

Which part of the lateral orbital wall thickens considerably near the sphenoid bone?

Zygomatic portion Signup and view all the answers

What is the main protractor of the eyelids?

Orbicularis oculi muscle Signup and view all the answers

Which nerve innervates the Orbicularis oculi muscle?

Facial nerve Signup and view all the answers

What passes through the inferior orbital fissure?

Maxillary nerve Signup and view all the answers

How does the floor of the orbit curve towards the superior orbital fissure?

It dips inferiorly Signup and view all the answers

What does the medial orbital wall separate from the orbit?

Ethmoid sinuses and nasal cavity from the orbit Signup and view all the answers

What is the primary function of the thicker bone at the apex and base of the orbit?

To allow the apex to protect the brain and optic nerve from direct force Signup and view all the answers

What is the main function of the curvilinear orbital walls?

To maintain the projection of the ocular globe and cushion it from blunt force Signup and view all the answers

Where is the supratrochlear nerve located in relation to the supraorbital nerve?

$16$ mm lateral to midline, between the pulley of the superior oblique and the supraorbital notch or foramen Signup and view all the answers

What is the relative thickness of the zygomatic portion of the lateral orbital wall?

It thickens considerably as it nears the sphenoid bone Signup and view all the answers

What is the main function of the lateral orbital rim having the least projection?

To facilitate lateral vision Signup and view all the answers

What is the main role of the medial orbital wall?

Dividing the ethmoid sinuses and nasal cavity from the orbit Signup and view all the answers

Which structure transmits the maxillary nerve and inferior ophthalmic vein?

Inferior Orbital Fissure Signup and view all the answers

Which muscle is responsible for gentle lid closure?

Orbicularis Oculi (palpebral part) Signup and view all the answers

Which nerve innervates both the temporal and zygomatic branches of the facial nerve?

Nasociliary Nerve Signup and view all the answers

What passes through the superior orbital fissure?

Frontal Nerve and Trochlear Nerve Signup and view all the answers

Anatomy of the Orbit

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