The lobes of the thyroid gland are more extensive and paler in color
than in the horse; they extend further forward, overlapping the
crico-pharyngeus muscle to a small extent, and come in contact dorsally
with the œsophagus. They are flattened, and have an irregular, lobulated
surface. In the young subject the isthmus is well developed, being about
half an inch (ca. 1 to 1.5 cm.) in width.
Accessory thyroids may be found, and parathyroids also occur near the
posterior extremity or inner surface of the lateral lobes of the
thyroid.
[Illustration: