Exercise XIV 



VERTEBRATE ANATOMY 73 



You will not be able, of course, to dissect the 

 brain, but the frog eye is large and can be ex- 

 amined. Identify its parts. Excise the eye, and 

 carefully cut around its equator. Lift offthe 



cornea, iris, and lens (which will come away 

 together). Then with a thin blunt instrument, 

 lift the retina and pigment layers from the back 

 of the eye cup. 



EQUIPMENT 



Per student 



dissecting tools 



microscope (dissecting and compound) 



slides and cover slips 



dropper and 12" rubber tubing 



dissecting pan 



frog or rat 



Per 8 students 



stimulator and electrodes 



box of pins 



25 cc saline (0.9%) 



Per 30 students 



4 rongeurs 



bottle of nembutal (50 mg/ml) (50 cc) 

 1-cc syringe and No. 27 needle 



5 pithing needles 



1 pr. gloves for handling rats 



stained sections of major frog and rat organs 



wall charts of frog and rat dissections 



skeletons of frogs and rats 



model of human thorax 



