Anatomy of the Eye: Vascular Layer and Ciliary Body

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What is the main function of the circularly arranged sphincter pupillae?

Increases pupil diameter

Supports nonvisual retina

Reinforces light-absorbing property of the choroid

Decreases pupil diameter (correct)

Which muscle is responsible for dilating the pupil?

Circularly arranged sphincter pupillae

Radially arranged dilator pupillae (correct)

Optic part of the retina

Nonvisual part of the retina

What is the main function of the pigmented layer in the retina?

Reinforces light-absorbing property of the choroid (correct)

Increases pupil diameter

Supporting cells

Decreases pupil diameter

Which part of the retina extends over the ciliary body and iris?

Nonvisual retina (A) Signup and view all the answers

What are the two functional parts of the optic part of the retina?

Neural layer and pigmented layer (D) Signup and view all the answers

Which muscle decreases its diameter to constrict or contract the pupil?

Sphincter pupillae (B) Signup and view all the answers

What is responsible for the 'red eye' reflection in flash photography?

Choroid (C) Signup and view all the answers

Which part of the eye connects the choroid with the circumference of the iris?

Ciliary body (A) Signup and view all the answers

What fills the anterior segment of the eyeball, suspensory ligament, and ciliary body?

Aqueous humor (A) Signup and view all the answers

Which structure on the internal surface of the ciliary body secretes aqueous humor?

Ciliary processes (D) Signup and view all the answers

What is the central aperture in the iris called?

Pupil (B) Signup and view all the answers

What controls the thickness and focus of the lens in the eye?

Ciliary body (B) Signup and view all the answers

What nerve provides innervation to the cornea?

Ophthalmic nerve (CN V1) (D) Signup and view all the answers

Which layer of the eyeball is responsible for nourishing the avascular cornea?

Choroid (C) Signup and view all the answers

What causes severe pain when small foreign bodies are in contact with the cornea?

Drying of the corneal surface (B) Signup and view all the answers

Where is the limbus of the cornea located?

At the junction of sclera and cornea (C) Signup and view all the answers

Which layer forms the largest part of the vascular layer of the eyeball?

Choroid (B) Signup and view all the answers

What is responsible for supplying the light-sensitive layer of the retina with oxygen and nutrients?

Choroid (B) Signup and view all the answers

What is the function of the central retinal artery in the retina?

Supplies blood to the neural layer of the retina (B) Signup and view all the answers

Which structure appears darker at the posterior pole of the eyeball?

Macula lutea (A) Signup and view all the answers

How are the layers of the developing retina separated in the embryo?

By intraretinal space (D) Signup and view all the answers

What is the significance of detachment of the retina?

Detachment can lead to loss of vision and requires medical attention (A) Signup and view all the answers

What is the function of an ophthalmoscope in examining the eye?

To view the fundus of the eye (D) Signup and view all the answers

Where do retinal arteries and veins radiate from over the fundus in the eye?

From the optic disc (D) Signup and view all the answers

What is the function of the fibrous layer of the eyeball?

Offers resistance and gives shape to the eyeball (D) Signup and view all the answers

Which part of the eye is visible through the transparent bulbar conjunctiva as 'the white of the eye'?

Sclera (D) Signup and view all the answers

How does the convexity of the cornea compare to that of the sclera?

The cornea has greater convexity than the sclera (C) Signup and view all the answers