Anatomy Of Retina

Ans. Is nasal to the fovea centralis

Ans. Coincides with the fovea centralis

Ans. At the lamina cribrosa

Ans. Inf pole

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

Ans. C i.e. Indirect ophthalmoscopy

Retina is a part of CNS and develops from Neuroectoderm.

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.

Ans. b. 2DD

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.

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.