Abstract
The thyroid nerves are mostly post-ganglionic sympathetic fibres. Most nerves enter the gland through the hila, either as vascular nerve bundles and plexuses, or as independent hilar bundles and fibres. The latter eventually become related to the vessels. The vascular nerve bundles are closely associated with the arteries and they supply fibres to the vascular plexuses and others that enter the parenchyma[long dash]the interfollicular nerves. The arteries have a rich innervation, usually consisting of two inter-connected plexuses, one in the tunica media and the other in the adventitia. The arterioles and capillaries are supplied by fibres derived from both vascular nerve plexuses and the interfollicular nerves. There is no definite histological evidence of a secretomotor supply.

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