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

List the different systems of the body, List the different systems of the b...

List the different systems of the body a) Nervous System b) Respiratory System c) Cardiovascular System d) Neurological and Sensory System e) Gastrointestinal Syste

Nitrogen fixation in soil, what is the process of nitrogen fixation in soil...

what is the process of nitrogen fixation in soil by bacteria

Shell - body form protozoans, Shell - body form Protozoans Majority of...

Shell - body form Protozoans Majority of protozoans posses an exoskeleton in the form of a shell, also called test. The shell forms a loose covering around the body of the ani

Define the effects of dietary fibre, Define the Effects of Dietary Fibre? ...

Define the Effects of Dietary Fibre? After reviewing the properties of fibre, we will now study various physiological effects of fibre, as it passes through the gut. The effect

Explain about central nervous system, Central Nervous System (CNS) Cove...

Central Nervous System (CNS) Covering of the brain and spinal cord is called Meanings (membranes which cover and protect brain and spinal cord are called meanings) There is flu

Eye ball, WALL OF EYE BALL - Outer to inner 3 layers present. 1. Scl...

WALL OF EYE BALL - Outer to inner 3 layers present. 1. Sclerotic or fibrous Tunic 2. Choroid or uvea or vescular Tunic. 3. Retina or neuro sensory tunic. Sclerotic

Lactation, LACTATION - Production of milk in the female's breasts af...

LACTATION - Production of milk in the female's breasts after delivery is lactation. Prolactin is responsible to synthesize milk in breast. Oxytocin is responsibleto gi

Explain ground system, G round system:  Plant tissue system, composed com...

G round system:  Plant tissue system, composed commonly of parenchyma cells with some collenchyma and sclerenchyma cells, that occupies the space between the epidermis and the va

What is an immunotoxin, Immunotoxin is formed by conjugating or combining a...

Immunotoxin is formed by conjugating or combining an antibody with highly toxic agent.

Illustrate sulfur photosynthetic bacteria, Q. What is the molecule that don...

Q. What is the molecule that donates hydrogen for photosynthesis, in sulfur photosynthetic bacteria? In sulfur photosynthetic bacteria the substance that donates hydrogen is hy

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