Anatomy LE 3: Eye and Orbital Structures

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What is the outer layer of the eyeball?

Retina

Uvea

Sclera (correct)

Choroid

Which muscle is responsible for moving the eyeball medially?

Superior Rectus Muscle

Medial Rectus Muscle (correct)

Inferior Oblique Muscle

Lateral Rectus Muscle

What is the function of the lacrimal gland?

To focus the lens

To move the eyeball

To blink the eyelid

To produce tears (correct)

What is the name of the blood vessel that supplies the eyeball?

Ophthalmic artery Signup and view all the answers

What is the name of the layer of the eyelid that contains glands?

Tarsal plate Signup and view all the answers

What is the name of the muscle that moves the eyeball superiorly and medially?

Superior Rectus Muscle Signup and view all the answers

What is the name of the layer of the eyeball that contains light-sensitive cells?

Retina Signup and view all the answers

What is the name of the layer of the orbit that contains fat?

Orbital fat Signup and view all the answers

What is the primary function of the eyelids?

To protect the eye from injury and excessive light Signup and view all the answers

What lies between the eyelids and serves as the elliptical opening for the eyes?

Palpebral fissure Signup and view all the answers

Which of the following is NOT a component of the eyelids?

Sclera Signup and view all the answers

What is the main function of the Superior Tarsal Muscle/Muller's muscle?

To raise the eyelid Signup and view all the answers

What is the function of the Tarsal/Meibomian glands?

To secrete lipid product that prevents sticking together of eyelids Signup and view all the answers

What is the outermost layer of the eyelid?

Skin Signup and view all the answers

What is the name of the glands found at the openings of the follicles of each cilia?

Glands of Zeis Signup and view all the answers

What composes the roof/superior wall of the orbital walls?

Orbital part of the frontal bone and the lesser wing of sphenoid Signup and view all the answers

How many layers does the eyelid have?

5 Signup and view all the answers

Which orbital wall is the thinnest?

Floor/inferior wall Signup and view all the answers

What is the composition of the medial wall?

Orbital plate of the ethmoid, frontal process of the maxilla, lacrimal, and sphenoid bones Signup and view all the answers

Which orbital wall is the strongest and thickest?

Lateral wall Signup and view all the answers

What is the composition of the lateral wall?

Frontal process of zygomatic bone and greater wing of sphenoid Signup and view all the answers

What is the most likely damaged wall in a blow-out fracture?

Floor/inferior wall Signup and view all the answers

What is visible in the MRI of the patient with a blow-out fracture?

Blood and/or other orbital contents such as fat Signup and view all the answers

What is the term for the partial posterior displacement of the eye?

Enophthalmos Signup and view all the answers

What is the primary function of the parasympathetic impulse from the facial nerve?

To stimulate the lacrimal gland to secrete fluid Signup and view all the answers

In which direction do the tears flow from the lacrimal ducts?

Inferiorly and medially Signup and view all the answers

Where are the tears collected after being swept over the eye?

Lacrimal puncta Signup and view all the answers

What is the purpose of the nasolacrimal duct?

To drain tears into the nasal cavity Signup and view all the answers

Why do we sometimes swallow tears when we cry?

Because the tears drain into the nasal cavity Signup and view all the answers

What is the role of blinking in the flow of tears?

To sweep tears over the eye Signup and view all the answers

Where are the lacrimal puncta located?

On the upper and lower eyelids near the lacrimal lake Signup and view all the answers

What is the relationship between the facial nerve and the lacrimal gland?

The facial nerve stimulates the lacrimal gland to produce tears Signup and view all the answers

What is the main function of the Orbicularis oculi muscle?

To constrict the eyelid during blinking Signup and view all the answers

How many axes does the eye move in?

3 axes Signup and view all the answers

Which nerve innervates the Lateral Rectus muscle?

Abducens Nerve (CN VI) Signup and view all the answers

What muscles are involved in looking at a specific gaze towards the left and downward?

Left Inferior rectus muscle and Right Superior oblique muscle Signup and view all the answers

What is the effect of parasympathetic stimulation on the ciliary muscle?

It causes the ciliary muscle to contract Signup and view all the answers