Dissection of the eye and its orbit in the cat

Download 345.5 Kb.
Size345.5 Kb.
1   2   3   4   5   6

Hold the eye over a petri dish lid, extend the cut (keep it shallow) sagittally through the center of the cornea. Note that aqueous humor drains out as the cornea is being cut. 

As you lift the cut anterior piece, note that the lens is attached to it by suspensory ligaments. Cut through the iris, and lift off the cut portion, cutting its ligaments. 


Note that the lens is opaque-white, an artifact of preservation. The posterior cavity is filled with clear jelly-like vitreous humor . Note the three tunics of the wall of the eye: 
      fibrous tunic (sclera plus cornea) 
      vascular tunic (iris, ciliary body and choroid) 
      nervous (retina)

Here is a labeled image of the components of the eye (upper image in left frame).


The retina will appear pearly yellow. Note the optic disk identifiable by the vessels may be seen to emerge from it, and pass under the retina.

The fovea centralis will be towards the center and seen as a yellowish depression.  (Here is a labeled image.)

The retina peels away easily from the underlying choroid.  This, a detached retina is a serious condition requiring immediate attention in patients to prevent death of the retina and blindness in the patient.

In the anterior portion of the eye, note that the lens is supported by suspensory ligaments. Posterior to it is the ruffled surface of the black pigmented ciliary processes which produce the aqueous humor
The ora serrata is the anterior boundary of the retina.  The iris is golden on the exterior surface, black on the posterior. The cornea is tough and relatively thick.

Share with your friends:
1   2   3   4   5   6

The database is protected by copyright ©dentisty.org 2019
send message

    Main page