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

Composting, C o m p o s t i n g It is a modification of a conv...

C o m p o s t i n g It is a modification of a conventional or solid manure handling system with anaerobic decomposition. Types of composting systems include windrow, b

Spastic and obstructive constipation, Q. Spastic and Obstructive constipati...

Q. Spastic and Obstructive constipation? Spastic constipation: It results from excessive tone of the colonic muscle. Obstructive constipation: It occurs usually due to obstr

Endothermic and exothermic reactions, List out the endothermic and exotherm...

List out the endothermic and exothermic reactions taking place in our body

Proteins, .please i need someone who can finish the assignment today , and ...

.please i need someone who can finish the assignment today , and one reliable who will not cancel the order at last time.in regards to the assignment, the are two pages of question

What are the epithelial tissues, Q. What are the epithelial tissues? What i...

Q. What are the epithelial tissues? What is their general function and how is that function associated to the features of the tissue? Epithelial tissues also called as epitheli

What are the other substances resorbed by nephron tubules, Where does most ...

Where does most of the water resorbed after glomerular filtration go? What are the other substances resorbed by the nephron tubules? Only 0.5 to 1% of the glomerular filtrate i

Oxaloacetate to malate, Oxaloacetate to Malate Oxaloacetate to Malate:...

Oxaloacetate to Malate Oxaloacetate to Malate: Oxaloacetate cannot  permeate mitochondria 1 membrane well and it must be transported across the membrane in the form of malate

Crisis due to deforestation, Crisis due to Deforestation Due to conti...

Crisis due to Deforestation Due to continuing deforestation we are faced with a major ecological and socio-economic crisis. To reverse this trend of deforestation a National

Explain the major classes of lipids, Explain the major classes of lipids ...

Explain the major classes of lipids The major classes of lipids are simple lipids (acylglycerols and waxes); Compound lipids (glycerophospholipids); Derived lipids (compounds t

What is adp phosphorylation, What is ADP phosphorylation? What respectively...

What is ADP phosphorylation? What respectively are photophosphorylation and oxidative phosphorylation? ADP phosphorylation is the addition of one inorganic phosphate in the mol

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