Thyroid gland of Animals
The thyroid gland of animals is a very vascular ductless gland, soft and dark red in color. It is situated on the cranial part of trachea.
Thyroid gland of Ox
The thyroid gland of Ox is a very vascular ductless gland, soft and dark red in colour. It is situated on the cranial part of trachea. It consists of two lateral lobes and a connecting isthmus. The lateral lobes are irregularly triangular in outline and are flattened.
They are situated on the lateral aspects of the first one or two tracheal rings. The superficial face is related to the sternothyrohyoideus, sternocephalicus, common carotid artery, internal jugular vein, vagus and sympathetic nerves. The deep face is related to the trachea. The cranial pole is narrow.
The isthmus is band like and connects the caudal ends of the lateral lobes and extends around the ventral face of the first tracheal ring. The weight is about 14 to 15 gm.
Thyroid gland of Sheep and Goat
Lateral lobes have a long elliptical outline and lie on the each side of the 5th or 6th ring of the trachea in sheep and goats. Thyroid are connected by a flat glandular isthmus. Accessory thyroids may be seen near the caudal extremity of the lateral lobes of thyroid.
Thyroid gland of Horse
Thyroid gland of Horse is firmer in texture. Lateral lobes are rounded; the average weight is about 15 gm. The cranial pole is large. The isthmus is extremely fine.
Thyroid gland of Dog
The lateral lobes are long, narrow and flattened and are situated along the lateral face of the trachea from the larynx to the 6th or 7th tracheal ring in dog. Caudal pole of thyroid gland is pointed. The isthmus is inconstant.
Thyroid gland of Rabbit
Thyroid are relatively small in rabbit.
Thyroid gland of Fowl
The thyroid gland of fowl consists of two oval bodies situated at the root of the neck on each side of trachea and oesophagus in relation to the common carotid artery just cranial to the branching off the brachial artery. They are deep red in colour. Large and the lateral lobes are triangular in outline. They are united ventrally so that an isthmus cannot be distinguished.