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Difficulty: EasyNervous Coordination and Sense Organs

Arrange the following structures of the mammalian eye in the correct sequence through which light passes before reaching the photoreceptor cells.

  1. 1Cornea
  2. 2Aqueous humour
  3. 3Lens
  4. 4Vitreous humour
  5. 5Retina

Answer

The correct order of structures through which light passes to reach the photoreceptors is: Cornea → Aqueous humour → Lens → Vitreous humour → Retina.
Light entering the eye must pass through transparent media in a specific anterior-to-posterior sequence. It enters at the cornea, passes through the aqueous humour in the front chamber, enters the pupil to be focused by the lens, travels through the vitreous humour in the rear cavity, and finally hits the photoreceptors located on the retina.

Step-by-Step Solution

1
Identify the outermost transparent layer of the eye.
Cornea
The cornea forms the transparent front part of the eyeball that first receives and refracts light.
2
Trace the path through the fluid in the anterior chamber.
Aqueous humour
Aqueous humour is the clear fluid located in the space between the cornea and the lens.
3
Identify the primary adjustable focusing structure.
Lens
Light passes through the pupil into the crystalline lens, which fine-tunes light focus.
4
Trace light through the posterior cavity.
Vitreous humour
The vitreous humour is the clear gel filling the large space behind the lens.
5
Identify the inner sensory layer.
Retina
The retina is the light-sensitive lining where rods and cones convert light into nerve impulses.

Key Concept

Pathway of light transmission through the mammalian eye
Estimated Time:1m 0s
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Topics

Nervous Coordination and Sense Organs

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