S 1.2 Eyeball - pt.2 - B

Question 1

This is a heavily pigmented vascular coat that absorbs light that has passed through the retina, creating a dark chamber for the eyeball. It consists of three parts, namely, choroid, ciliary body and iris. The arteries of this layer are derived from branches of ophthalmic artery and are responsible for nourishment of 1st–4th layer of retina.

Answer 1

Middle Vascular Pigmented Coat/Uveal Tract

Question 2

Middle Vascular Pigmented Coat/Uveal Tract:
It consists of three parts, namely?

Answer 2

• choroid
• ciliary body
• iris

Question 3

Middle Vascular Pigmented Coat/Uveal Tract:
The arteries of this layer are derived from branches of ophthalmic artery and are responsible for nourishment of ________ layer of retina.

Answer 3

1st–4th

Question 4

Middle Vascular Pigmented Coat/Uveal Tract:
- It is the posterior part of the middle coat and lies between sclera and retina.
- It is rich in small blood vessels and pigment cells, which give a purple black color to this coat.
- It is made of the following layers from superficial to deep: Suprachoroidal layer, Vascular layer, Choriocapillary layer, and Bruch’s membrane (glossy membrane)

Answer 4

Choroid

Question 5

Middle Vascular Pigmented Coat/Uveal Tract: Choroid: Which layer?
- Loose connective tissue rich in melanocytes

Answer 5

Suprachoroidal layer

Question 6

Middle Vascular Pigmented Coat/Uveal Tract: Choroid: Which layer?
- Loose connective tissue rich in melanocytes and medium-sized blood vessels

Answer 6

Vascular layer

Question 7

Middle Vascular Pigmented Coat/Uveal Tract: Choroid: Which layer?
- Capillary network essential for nourishment of retina

Answer 7

Choriocapillary layer

Question 8

Middle Vascular Pigmented Coat/Uveal Tract: Choroid: Which layer?
- Refractile hyaline layer forming basement membrane of the
pigment epithelium of retina

Answer 8

Bruch’s membrane (glossy membrane)

Question 9

Middle Vascular Pigmented Coat/Uveal Tract:
- It is a circumferentially thickened part of the middle coat extending from the ora serrata to the edge of lens.
- Its anterior part presents radially oriented ridges called ciliary processes and they give attachment to the suspensory ligament (zonule) of lens.
- This is triangular on cross section. It is mainly formed by ciliary muscle (smooth muscle) oriented
in longitudinal, circular and radial directions.

Answer 9

Ciliary Body

Question 10

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body:
Its anterior part presents radially oriented ridges called _______ _________ and they give attachment to the suspensory ligament (zonule) of lens.

Answer 10

ciliary processes

Question 11

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body:
It is __________ on cross section.

Answer 11

triangular;

Question 12

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body:
It is mainly formed by ciliary muscle (________ muscle) oriented in longitudinal, circular and radial directions.

Answer 12

smooth

Question 13

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body:
Ciliary muscle is innervated by _____________nerve fibers.

Answer 13

parasympathetic

Question 14

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body:
This muscle is also called muscle of accommodation

Answer 14

Ciliary muscle

Question 15

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body:
- It is responsible for production of aqueous humour
- It is the forward prolongation of
nonsensitive part (ciliary part) of retina beyond the ora serrata

Answer 15

Ciliary epithelium

Question 16

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body: Ciliary epithelium:
This layer is the pigmented cuboidal epithelium and is continuous with the pigment epithelium of retina

Answer 16

superficial layer

Question 17

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body: Ciliary epithelium:
This layer is the nonpigmented columnar epithelium which is continuous with the nervous layer of retina at the ora serrata

Answer 17

deep layer

Question 18

Middle Vascular Pigmented Coat/Uveal Tract: Ciliary Body: Ciliary epithelium:
Anteriorly, both layers (superficial and deep) are pigmented and line the posterior surface of the _____ as iridial part of retina.

Answer 18

iris

Question 19

Middle Vascular Pigmented Coat/Uveal Tract:
- It is the anterior most part of the middle coat.
- It forms a pigmented circular diaphragm placed in front of the lens with an aperture in the center, the pupil

Answer 19

Iris

Question 20

Middle Vascular Pigmented Coat/Uveal Tract: Iris:
Through the _______ the anterior and posterior chambers communicate

Answer 20

pupil

Question 21

Middle Vascular Pigmented Coat/Uveal Tract: Iris:
What are the muscles present that the size of the aperture is controlled, that is also innervated by parasympathetic and sympathetic nerve fibers respectively.?

Answer 21

sphincter pupillae and dilator pupillae

Question 22

Middle Vascular Pigmented Coat/Uveal Tract: Iris: What muscle (Sphincter pupillae or Dilator pupillae)?
- It is circularly arranged near the pupillary margin of the iris and it causes constriction of pupil

Answer 22

Sphincter pupillae (smooth muscle)

Question 23

Middle Vascular Pigmented Coat/Uveal Tract: Iris: What muscle (Sphincter pupillae or Dilator pupillae)?
- It is radially arranged and causes dilation of pupil

Answer 23

Dilator pupillae (myoepithelial cells–derived from posterior pigment
epithelium of iris)

Question 24

Middle Vascular Pigmented Coat/Uveal Tract: Iris: Which surface (rough anterior or smooth posterior) has no epithelial lining and is covered by a discontinuous layer of pigmented cells and fibroblasts?

Answer 24

rough anterior surface

Question 25

Middle Vascular Pigmented Coat/Uveal Tract: Iris: Which surface (rough anterior or smooth posterior) is covered by a double layer of pigmented cuboidal epithelium (iridial part of retina)?

Answer 25

smooth posterior surface

Question 26

Middle Vascular Pigmented Coat/Uveal Tract: Iris:
The central core is formed by ______________ pigmented connective tissue stroma. The color of the eye depends on the amount of _________ pigment.

Answer 26

vascular; stromal

Question 27

Middle Vascular Pigmented Coat/Uveal Tract: Iris:
______ eyes contain little pigment
whereas ________ eyes have more pigments.

Answer 27

Blue; brown