Anatomy Of Retina

ANATOMY OF RETINA

Q. 1

The optical axis of the eye meets the retina at a point which:

 A

Coincides with the fovea centralis

 B

Is nasal to the fovea centralis

 C

Is temporal to the fovea centralis

 D

Is nasal to optic disc

Q. 1

The optical axis of the eye meets the retina at a point which:

 A

Coincides with the fovea centralis

 B

Is nasal to the fovea centralis

 C

Is temporal to the fovea centralis

 D

Is nasal to optic disc

Ans. B

Explanation:

Ans. Is nasal to the fovea centralis


Q. 2

Visual axis of the eye meets the retina at a point which:

 A

Coincides with the fovea centralis

 B

Is nasal to fovea centralis

 C

Is nasal to optic disc

 D

Is temporal to fovea centralis

Q. 2

Visual axis of the eye meets the retina at a point which:

 A

Coincides with the fovea centralis

 B

Is nasal to fovea centralis

 C

Is nasal to optic disc

 D

Is temporal to fovea centralis

Ans. A

Explanation:

Ans. Coincides with the fovea centralis


Q. 3

The most common site of obstruction in central retinal artery is:

 A

In front of the lamina cribrosa

 B

At the lamina cribrosa

 C

Behind the lamina cribrosa

 D

The point where the artery enters the optic nerve

Q. 3

The most common site of obstruction in central retinal artery is:

 A

In front of the lamina cribrosa

 B

At the lamina cribrosa

 C

Behind the lamina cribrosa

 D

The point where the artery enters the optic nerve

Ans. B

Explanation:

Ans. At the lamina cribrosa

Quiz In Between


Q. 4

Broadest neuroretinal rim is seen in:

 A

Sup role

 B

Inf pole

 C

Nasal pole

 D

Temporal lobe

Q. 4

Broadest neuroretinal rim is seen in:

 A

Sup role

 B

Inf pole

 C

Nasal pole

 D

Temporal lobe

Ans. B

Explanation:

Ans. Inf pole


Q. 5

Not a layer of retina:    

 A

Outer limiting membrane

 B

Retinal pigment epithelium

 C

Bowman’s membrane

 D

Ganglion cell layer

Q. 5

Not a layer of retina:    

 A

Outer limiting membrane

 B

Retinal pigment epithelium

 C

Bowman’s membrane

 D

Ganglion cell layer

Ans. C

Explanation:

Layers of the retina, from the outside inwards

  • Retinal Pigment Epithelium
  • Layer of rods and cones
  • External (Outer) limiting membrane
  • Outer nuclear layer
  • Outer plexiform layer
  • Inner nuclear layer
  • Inner plexiform layer
  • Ganglion cell layer
  • Layer of optic nerve fibres
  • Internal (Inner) limiting membrane

The neural retina meets the optic nerve at the optic. disc (or optic papilla), which is devoid of photoreceptor cells, forming a blind spot in the visual field.

The fovea, lateral to the optic disc, is the area of greatest visual acuity, and is surrounded by a yellow pigmented zone called the fovea lutea.

Bowman’s membrane is present in cornea


Q. 6

Method use to view periphery of retina:

March 2013 (b)

 A

Direct ophthalmoscopy

 B

Retinoscopy

 C

Indirect ophthalmoscopy

 D

None

Q. 6

Method use to view periphery of retina:

March 2013 (b)

 A

Direct ophthalmoscopy

 B

Retinoscopy

 C

Indirect ophthalmoscopy

 D

None

Ans. C

Explanation:

Ans. C i.e. Indirect ophthalmoscopy

Quiz In Between


Q. 7

Retina is part of ‑

 A

CNS

 B

PNA

 C

ANS

 D

None

Q. 7

Retina is part of ‑

 A

CNS

 B

PNA

 C

ANS

 D

None

Ans. A

Explanation:

Retina is a part of CNS and develops from Neuroectoderm.


Q. 8

Photosensitive layer of retina ‑

 A

Pigment layer

 B

Layers of rods and cones

 C

External limiting membrane

 D

Internal limiting membrane

Q. 8

Photosensitive layer of retina ‑

 A

Pigment layer

 B

Layers of rods and cones

 C

External limiting membrane

 D

Internal limiting membrane

Ans. B

Explanation:

Ans. is ‘b’ i.e., Layers of rods and cones

  • Rods and cones are the end organs of vision and are also known as photoreceptors.
  • Layer of rods and cones contains only the outer segments of photoreceptor cells arranged in a palisade manner. There are about 120 millions rods and 6.5 millions cones.
  • Rods contain a photosensitive substance visual purple (rhodopsin) and subserve the peripheral vision and vision of low illumination (scotopic vision).
  • Cones also contain a photosensitive substance and are primarily responsible for highly discriminatory central vision (photopic vision) and colour vision.

Q. 9

The total area of retina seen in direct ophthalmoscopy is:

 A

IDD

 B

2DD

 C

3DD

 D

4DD

Q. 9

The total area of retina seen in direct ophthalmoscopy is:

 A

IDD

 B

2DD

 C

3DD

 D

4DD

Ans. B

Explanation:

Ans. b. 2DD

Quiz In Between


Q. 10

The retina is an out growth of the ‑

 A

Mesencephalon

 B

Diencephalon

 C

Telencephalon

 D

Pons

Q. 10

The retina is an out growth of the ‑

 A

Mesencephalon

 B

Diencephalon

 C

Telencephalon

 D

Pons

Ans. B

Explanation:

Ans. is ‘b’ i.e., Diencephalon

  • Diancephalon forms – optic cup and stalk, pituitary, thalmus, hypothalmus, epithalmus, pineal gland (or epiphysis), and 3rd ventricle (most part).
  • Retina develops from walls of optic cup. The outer thinner layer becomes retinal pigmented epithelium and inner thicker layer forms neural layer of retina.

Q. 11

The junction between Retina & Ciliary body is 

 A

Equator

 B

Pars plicata

 C

Pars plana

 D

Ora serrata

Q. 11

The junction between Retina & Ciliary body is 

 A

Equator

 B

Pars plicata

 C

Pars plana

 D

Ora serrata

Ans. D

Explanation:

Ans. is ‘d’ i.e., Ora serrata

  • Ora serrata is the serrated peripheral margin where the retina ends.
  • Here retina is firmly attached both to vitreous & choroid.
  • Pars plana (of ciliary body) extends anteriorly from ora serrata.

Quiz In Between



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