. The endocrine organs; an introduction to the study of internal secretion . an larynx and oesophagus fromthe dorsal aspect, showing the thy-roid and parathyroids. The thyroid may also contain a portion of tissue resembling thymusgland, and, like that, containing lymphocytes and corpuscles of portion of thymus tissue is developed from the same branchial pouch(IV) as the upper parathyroid, whereas the main thymus is developed 12 The Endocrine Organs from pouch III, which gives origin to the lower parathyroid (fig. 2). Accessory thyroids, usually quite small, occasionally occur in t
. The endocrine organs; an introduction to the study of internal secretion . an larynx and oesophagus fromthe dorsal aspect, showing the thy-roid and parathyroids. The thyroid may also contain a portion of tissue resembling thymusgland, and, like that, containing lymphocytes and corpuscles of portion of thymus tissue is developed from the same branchial pouch(IV) as the upper parathyroid, whereas the main thymus is developed 12 The Endocrine Organs from pouch III, which gives origin to the lower parathyroid (fig. 2). Accessory thyroids, usually quite small, occasionally occur in the tissues of, the neck and in the anterior mediastinum. Accessoryparathyroids also occur;they are common in therabbit, and are in this animaloften found to a consider-able number embedded inthe thymus. This is alsothe case with the rat. In the rat, mouse, andguinea-pig only the parathy-roid III is ordinarily present,and this varies greatly in posi-tion relatively to the thyroid is repre-sented in all Amphioxus and Am-mocnetes it retains an open. Tfiym. /// _ body I
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