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  • The choroid layer is thin over the posterior two-thirds of the eyeball, but it becomes thick in the anterior part to form the   <

The choroid layer is thin over the posterior two-thirds of the eyeball, but it becomes thick in the anterior part to form the 

 

Option: 1

Iris

 


Option: 2

Cornea

 


Option: 3

Pupil

 


Option: 4

Ciliary body

 


Answers (1)

best_answer

 

 

As we have learnt:

Middle Layer or Vascular Coat: 

  • The middle layer, choroid, contains many blood vessels and looks bluish in colour. 
  • The choroid layer is thin over the posterior two-thirds of the eyeball, but it becomes thick in the anterior part to form the ciliary body. 
  • The ciliary body itself continues forward to form a pigmented and opaque structure called the iris which is the visible coloured portion of the eye.
  • The eyeball contains a transparent crystalline lens which is held in place by ligaments attached to the ciliary body. 
  • In front of the lens, the aperture surrounded by the iris is called the pupil. The diameter of the pupil is regulated by the muscle fibres of iris.

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The choroid layer is thin over the posterior two-thirds of the eyeball, but it becomes thick in the anterior part to form the ciliary body. Hence, the correct answer is option d.

Posted by

Suraj Bhandari

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