An extraordinarily rich vascularization is the common characteristic of all endocrine organs. A capillary network encircles the thyroid follicles (see Fig.360). This figure provides a vivid image of the capillary network at the surface of feline thyroid follicles. An interlobular artery is seen in the lower part of the figure. It continues in interfollicular vessels. In this preparation, the vessel system of the thyroid gland was only partially filled with resin. The capillary network is in reality much more elaborate.
Corrosion preparation (cf. Fig.303, 304); scanning electron microscopy; magnification: x 250
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