Open AccessThe thyroid and parathyroid glands throughout vertebrates
Publication year - 1910
Publication title -
proceedings of the royal society of london. series b, containing papers of a biological character
Language(s) - English
Resource type - Journals
eISSN - 2053-9185
pISSN - 0950-1193
DOI - 10.1098/rspb.1910.0030
Subject(s) - thyroid , biology , parathyroid gland , vertebrate , anatomy , endocrinology , pathology , medicine , parathyroid hormone , calcium , gene , biochemistry
1. The organs recognised as arising in the regions of the gill-clefts in Elasmobranchs are thyroid, thymus, and post-branchial body. The parathyroid and carotid glandules have not yet been discovered in these animals. 2. Within the thyroid gland of Elasmobranchs are small, solid masses of cells, partly epithelial, partly adenoid. These have not, so far as I am aware, been previously described. One is tempted to suppose that these are homologous either with parathyroid or thymus. In the latter case it would correspond with thymus IV of Mammals. (It has not been suggested that the thymus derivative of the fourth cleft furnishes isolated nodules in the thyroid of Elasmobranchs.)