Injection of Lymphatics: With Colored Cedar Oil; With Plastic

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Abstract
(1) The oil mass consists of: cedar oil, 1; color in oil (a paint pigment, e.g., Prussian blue), 1; and toluene, 2, parts by volume. To use, add 1 ml of diethyl ether to each 10 ml of mass, mix thoroughly and inject into the fresh organ with a very fine glass or metallic needle. Heat the organ in water at 50-60[degree]C before starting the injection, massage gently after injection, then fix. For macroscopic studies, fix 5 days in 5% formalin, and dissect. For microscopic studies, fix at least 5 days in: formalin, 10 ml; Al2(SO4)3, 2 gm; ZnSO4, 2 gm; acetic acid, 4 ml; and distilled water, 90 ml. Dehydrate with dioxane, embed in paraffin and section at 10-20 [mu]. Stain with hematoxylin-eosin or with one of the following modifications of Van Gieson''s formula: 1. 1% acid fuchsin, 10; picric acid (sat. aq.), 50; and 5% ZnSO4, 40 volumes. 2.1% acid fuchsin, 20; picric acid (sat. aq.), 80; and 5% COSO4, 40 volumes. (2) The plastic mass consists of a 5-10% solution of Rhodopas (a vinyl copolymer) in acetone. Injection is made as with the oil mass except that a plastic squeeze-bottle and glass needle is preferable to a syringe. Indirect injection is used for both procedures, i.e., into the organ substance; not into a cannulated lymphatic vessel. After the plastic has hardened (24 hr), the unfixed tissue is subjected to corrosion by 5-10% NaOH in water.

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