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Using female chicks, 20-30 days old, we studied on the histological changes of thyroid at 0, 1, 2, 4, 6, 24 hours after subcutaneous injection of 0.2 or 0.5mg adrenalin and summarise our results as follows:1. The sizes of follicular lumens become smaller after 1-2 hours, larger than those before injection after 4 hours, after 6 hours again as small as those after 1-2 hours, and are restored to normal state after 24 hours.2. The follicular cells become higher after 1-2 hours, lower after 4 hours than those before injection, and again higher after 6 hours, and are restored to normal figures after 24 hours.3. At 1-2 hours after injection, most follicular cells have tongue formic or peninsular processes in which large and small vacuoles are contained. After 4 hours these processes and vacuoles have almost vanished, and after 6 hours increase again. After 24 hours the thyroidal figures are restored to normal state.4. When observed with the electron microscope, the endoplasmic reticula in follicular cells are swollen, and have intensively fallen into follicular lumen 1-2 hours after injection. Mitochondria are also swollen and the arrangements of their cristae are out of order. After 4 hours, endplasmic reticula are reduced in their size and become flat, and most mitochondrial cristae are arranged regularly.5. These reactions are more remarkable in the cases of injection of 0.5mg adrenalin than in those of 0.2mg.6. Much dosis of adrenalin injection at one time, stimulates the thyroid gland transitorily and makes it secrete colloid intensively.

Histological Changes of the Thyroid Gland after Injection of Adrenalin