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

What is the microflake - t dehydration, What is the Microflake - T Dehydrat...

What is the Microflake - T Dehydration? This technique involves the drying of a continuous sheet of foam 20 mm thick on a continuous stainless steel belt. The later is heated f

Define role of fitness in field of human endeavour, Define Role of Fitness ...

Define Role of Fitness in Field of Human Endeavour? Fitness plays a vital role in any field of human endeavour and influences the efficiency of a person. For this reason, fitne

Infertility, what is the remedy of infertility

what is the remedy of infertility

How many times acidic is a ph=4, How many times more acidic is a pH=4 from ...

How many times more acidic is a pH=4 from a pH=7 solution?

Determine the type of bandage, Determine the type of bandage The most com...

Determine the type of bandage The most common type of bandage is the gauze bandage, a simple woven strip of material which comes in different widths and lengths.

Pulmonary autograft and ross procedure, Pulmonary Autograft and Ross Proced...

Pulmonary Autograft and Ross Procedure :  Sir Donald Ross in 1967 introduced the concept of using patient's own pulmonary valve (autograft) for aortic valve replacement and a pul

Explain non-surgical endodontic retreatment - missed canal, Explain Non-sur...

Explain Non-surgical Endodontic Retreatment - Missed Canal Missed root canal as it hold pulp tissues and bacteria is major cause of endodontic failure. Mandibular molar

Diagnostic evaluation of leukemia, Diagnostic Evaluation   A  study of ...

Diagnostic Evaluation   A  study of complete blood count (CBC) and blood chemistry mainly uric acid levels, is necessary for dignostic evaluation.  Radiologic  studies  are

Estrogens, Normal 0 false false false EN-IN X-NONE ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

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