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12

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Frogs Eye and Frogs Ear

Eye is guarded by immovable upper eyelid, movable lower eyelid and transparent nictitating membrane

Zoology [Science]

Central Board of Secondary Education [12]

3/2/2010Print This PageTell - A - FriendAdd to Wish ListReport Error

Frogs Eye

  1. Eye is guarded by immovable upper eyelid, movable lower eyelid and transparent nictitating membrane.



  2. Cuter sclerotic ring is cartilagenous and cornea is the part exposed out. Middle highly vascular, pigmented layer is choroid. Iris is yellow pigmented and perforated by a central aperature, the pupil. Retina is the innermost coat of eyeball and consist of inner pigmented layer and outer receptor layer. Rods and cones are light sensitive structures found in retina.

  3. Rods have rhodopsin or visual purple meant for night vision while cones have iodopsin responsible colour vision in day light.

  4. The anterior chamber is present in front of lens filled with aqueous humor while the chamber behind the lens is posterior chamber filled with vitreous humour.

    Eye ball is moved in the eye orbit by a set of six muscles - Two are oblique and four are recti. Besides, there are retractor bulbi and levator bulbi muscles for intrusion or protrusion of eye ball into the eye orbit, respectively.

Frogs Ear

  1. Ear of frog has only middle and internal ear. Tympanic membrane is present at the body surface. Middle ear has single bone called as columella auris. Pressure of middle ear is controlled by eustachian tube.

  2. Membranous labyrinth or internal ear consist of utriculus, sacculus, and semicircular canals. Endolymph fills the membranous labyrinth.

3/2/2010Print This PageTell - A - FriendAdd to Wish ListReport Error

Related Words:

Frogs Eye, Frogs Ear, Frogs Eyelid, Vertical Section Of Frogs Eye, Cartilagenous, Cornea, Pigmented Layer, Choroid, Retina, Receptor Layer, Rhodopsin, Iodopsin, Eye Ball, Retractor Bulbi, Levator Bulbi, Tympanic Membrane, Columella Auris, Eustachian Tube, Membranous Labyrinth, Utriculus, Sacculus, Semicircular Canals, Endolymph, Membranous Labyrinth

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