Question

A jelly like substance present in the posterior segment of the eye is

• A. aqueous humor
• B. vitreous humor
• C. cerebrospinal fluid
• D. none of the above

Answer 1

The correct option is B vitreous humor

A jelly like substance present in the posterior segment of the eye is vitreous humor. It is covered by a hyaloid membrane. It has pyruvic acid, lactic acid, hyaluronic acid, hyalocytes. It maintains a spherical shape of eyeball. It is never replaced.
Aqueous humor is a watery fluid present in the anterior segment of the eye. It is filtered out of ciliary processes. It has glucose, lactic acid, pyruvic acid. It provides nutrition to the avascular structures of the eye. It is continuously replaced.
Cerebrospinal fluid is a transparent, colorless, slightly alkaline fluid which is produced by anterior choroid plexus and posterior choroid plexus. It is constantly produced and reabsorbed. It consists of proteins, amino acids, potassium ions, sodium ions, bicarbobnate ions, oxygen etc. It is found in the ventricles of the brain, central canal of spinal cord and sub arachnoid space.