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

Why healthy skeletal muscle fiber is isolated, Why healthy skeletal muscle ...

Why healthy skeletal muscle fiber is isolated A healthy skeletal muscle fiber is isolated and has no external forces on it.  It has normal intracellular levels of ATP and is ba

What are the two reactants, What are the two reactants and the two products...

What are the two reactants and the two products of a dehydration reaction/ what are the two reactants and products of a hydrolysis reaction.

How does hcl also directly participate in digestion, Besides being fundamen...

Besides being fundamental for the activation of the main gastric digestive enzyme how does HCl also directly participate in digestion? With its corrosive effect, HCl also helps

Define in brief about the term - mri, Define in brief about the term - MRI ...

Define in brief about the term - MRI MRI is a more recent development that was initially introduced as a rival to CT. The technique itself is complex, relying on measurement o

Eggs of eutheria, EGG S OF EUTHERIA This egg is small & round. The dim...

EGG S OF EUTHERIA This egg is small & round. The dimeter of human egg is 0.1 mm. It has very little amount of yolk but they are also as alecithal egg. The egg is covered

Hypoglycemic effects of dietary factor, Define Hypoglycemic effects of Diet...

Define Hypoglycemic effects of Dietary Factor with antinutritional effect? Of the different carbohydrate foods tested for starch digestibility and blood glucose response, those

Pathophysiology and assessment of iron deficiency anaemia, Pathophysiology ...

Pathophysiology   Insufficient  amount of iron present in the body leads  to reduction in serum transferrin (Serum betaglobulin, which binds and transports iron) saturation.  T

Explain the concepts of food chain and food web, What is the difference bet...

What is the difference between the concepts of food chain and food web? The chain method is a theoretical model to study the energy flux in ecosystems. Actually in an ecosystem

Define eye balling, Q. Define Eye Balling? Ans. Two-dimensional ec...

Q. Define Eye Balling? Ans. Two-dimensional echocardiography provides a good visual perception of cardiac functions. With experience, the echocardiologist learns to percei

What are the valvular heart diseases, Q. What are the Valvular heart diseas...

Q. What are the Valvular heart diseases? Valvular heart disease is a common clinical problem. While rheumatic mitral valve disease seen more often in the underprivileged segmen

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