Development and structure of the frog: a photographic study by Addison Earl Lee

By Addison Earl Lee

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Extra resources for Development and structure of the frog: a photographic study

Sample text

Bend the flap of bone tissue forward and expose the brain (P). Re­ move the pituitary gland with forceps ( Q ) . It is spherical in shape, about 2 mm. in diameter, and pink in color. Be careful not to damage the gland. Repeat the procedure with enough frogs to obtain the proper number of pituitary glands. The proper number of pituitaries should be injected into the abdomen of an adult female frog. These should be taken into the barrel of the syringe before the needle {size no. 18) is attached. The needle should then be attached and inserted through the skin and abdominal muscles into the abdominal cavity (R).

42 VII.

How­ ever, frogs will remain alive for several weeks without feeding if kept at 4°C. Toads, unlike frogs, will eat in captivity, but only animals they see moving. , are satis­ factory as a diet for toads. In some respects, toads are easier than frogs to maintain in the laboratory. They do not require as moist an environment as the frog. Toads show the same general structures as frogs and may be used as successfully as frogs for many experiments. Toad eggs are much smaller than frog eggs, however, and thus it is not as easy to follow their embryologi­ cal development.

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