Eyeball - choroid, Biology

Assignment Help:

CHOROID -

  • Thin, net like made up of connective tissue, rich in blood vessels.
  • Pigment present, red in rabbit, brown or black in man. It reduces internal reflection.
  • Except cornea this layer is attached to sclerotic.
  • In front of cornea this layer froms a thin coloured partition i.e. iris. IRIS -
  • It is perforated in the middle by an aperture pupil. Iris is highly muscular
  • Circular and radial muscles are present. Circular muscles are sphincter type. Radial muscles are dilator type.
  • On contraction of circular muscles diameter of pupil is reduced it is myosis, it takes place in sharp light.
  • On contraction of radial muscles diameter of pupil is increased, it is mydriosis, it occurs in dimlight.
  • Atropine is used to dialate pupil.

2037_choroid.png

  • Basal part of iris is highly muscular having circular, radial and obligue muscles. It is known as cilliary body.
  • On its free surface 70 - 80 cilliary processes present secretes aquous humour in aquous chamber.
  • Cilliary body also affects convexity of lens.

1261_choroid1.png


Related Discussions:- Eyeball - choroid

Explain glycogen storage diseases, Glycogen Storage Diseases Glycogen  ...

Glycogen Storage Diseases Glycogen  storage diseases are caused by  genetic defects that result  in  deficiencies in  certain enzymes of  glycogen metabolism. These deficiencie

Important aspect of dietary management during hypertension, Q. Important as...

Q. Important aspect of dietary management during hypertension? Most important aspect of dietary management i.e. the intake of minerals and electrolytes, which are closely assoc

Thumb rule for dietary management, Q. Thumb rule for dietary management? ...

Q. Thumb rule for dietary management? The thumb rule for dietary management is to advice the patient to try to cut down or avoid:  Red meats. Organ meats such as br

What are the lateral meristems, What are the lateral meristems? Where can t...

What are the lateral meristems? Where can they be found and which kind of plant growth do they promote? The Lateral or the secondary, meristems, are the cambium and the phellog

Compare different communities for conservation purpose, "Diversity is good"...

"Diversity is good" is one of the axioms of conservation biology. However in absentia of historical information, why is noting higher diversity in a system NOT the best way to eval

Conformational protection - azotobacter, Conformational Protection - Azotob...

Conformational Protection - Azotobacter In conformational protection a Fe-S redox protein provides protection to the enzyme. The protein gets oxidised in the presence of oxyge

Respiration, lesson plan practical requirements

lesson plan practical requirements

Explain briefly about the nutrition, Explain briefly about the Nutrition? ...

Explain briefly about the Nutrition? This unit covers the scope of advanced nutrition. It begins with some definitions and basic concepts and briefly traces the history of nutr

Genetics of nitrogen-fixation, Genetics of Nitrogen-fixation The genet...

Genetics of Nitrogen-fixation The genetics of nitrogen-fixation is known in detail in Klebsiella pneumoniae. There are twenty genes required in organising the complete N 2 -fi

Vivipary - development biology, Vivipary - Development Biology In flow...

Vivipary - Development Biology In flowering plants the seed or fruit generally is dispersed and germination occurs when the conditions are congenial for growth. However, in so

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd