Bones of the Orbital Region

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Questions and Answers

Which of the following bones is NOT part of the bony orbit?

Occipital Bone

What is the primary function of the extraocular muscles in the orbital region?

To move and position the eyeball within the orbit

What is the main function of the bony orbit?

To protect the eye from external injury and trauma

Which of the following is NOT a soft tissue of the orbital region?

Sphenoid Bone Signup and view all the answers

What is the main function of the conjunctiva in the orbital region?

To lubricate the eye Signup and view all the answers

What is the overall function of the orbital region?

To support and facilitate the functions of the eye Signup and view all the answers

What is the location of the lymph vessels and nodes in the orbital cavity?

No lymph vessels or nodes are present Signup and view all the answers

How many voluntary muscles are involved in the movement of the eyeball?

Six Signup and view all the answers

What is the term used to describe the rotation of the eye upward?

Elevation Signup and view all the answers

What is the role of the inferior oblique muscle in eye movement?

It assists the superior rectus muscle to raise the cornea directly upward Signup and view all the answers

What is the point of reference used to describe the rotatory movements of the eyeball?

The upper rim of the cornea Signup and view all the answers

Through which structure do the inferior ophthalmic vein and pterygoid venous plexus communicate?

Inferior orbital fissure Signup and view all the answers

Through which structure does the tendon of the superior oblique muscle pass?

A fibrous pulley attached to the frontal bone Signup and view all the answers

In which direction does the tendon of the superior oblique muscle turn after passing through the trochlea?

Backward and laterally Signup and view all the answers

What is the purpose of the medial and lateral check ligaments?

To attach the tendon sheaths to the medial and lateral walls of the orbit Signup and view all the answers

What is the function of the fascial sheath of the eyeball?

To provide a socket for free movement of the eyeball Signup and view all the answers

Which muscles do not take part in the movement of the eyeball?

Ciliary muscle and constrictor pupillae Signup and view all the answers

What is the orientation of the origins of the superior and inferior recti muscles relative to their insertions?

About 23° medial to their insertions Signup and view all the answers

Which nerve supplies the sphincter pupillae?

Oculomotor nerve Signup and view all the answers

Where do the postganglionic fibers of the sphincter pupillae synapse?

Ciliary ganglion Signup and view all the answers

What is the function of the dilator pupillae?

To dilate the pupil in low light intensity Signup and view all the answers

What is the purpose of the macula lutea?

To enable most distinct vision Signup and view all the answers

What is the outer layer of the retina in contact with?

Choroid Signup and view all the answers

What is the anterior part of the retina composed of?

Pigment cells and columnar epithelium Signup and view all the answers

What is the function of the hyaloid artery in the fetus?

To fill the hyaloid canal Signup and view all the answers

What is the role of the vitreous body?

To support the posterior surface of the lens Signup and view all the answers

What is the shape of the lens?

Biconvex Signup and view all the answers

What attaches the lens to the ciliary processes?

The suspensory ligament Signup and view all the answers

What is the function of the suspensory ligament?

To attach the lens to the ciliary processes Signup and view all the answers

What is the result of the pull of the radiating fibers of the suspensory ligament?

The lens becomes flattened Signup and view all the answers

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