Textbook of normal histology: including an account of the development of the tissues and of the organs . Section of thyroid body of child: a, acini distended with colloid secretion, cut invarious directions ; b, interlobular connective tissue. undergoes atrophy and more or less complete obliteration ; the acini,consequently, become isolated closed cavities, while the organ isoften classed as a ductless gland. The fully-developed adult thyroid gland consists of numeroustubular acini, 40-110 /* in diameter, united by intertubular areolartissue into lobules ; these, in turn, are joined into lobes
Textbook of normal histology: including an account of the development of the tissues and of the organs . Section of thyroid body of child: a, acini distended with colloid secretion, cut invarious directions ; b, interlobular connective tissue. undergoes atrophy and more or less complete obliteration ; the acini,consequently, become isolated closed cavities, while the organ isoften classed as a ductless gland. The fully-developed adult thyroid gland consists of numeroustubular acini, 40-110 /* in diameter, united by intertubular areolartissue into lobules ; these, in turn, are joined into lobes by stilllarger masses of connective tissue, which form on the outside of theorgan a general external fibrous envelope. The acini are completely closed, and lined with a single layer ofcuboidal or low columnar epithelium, whose component cells restupon a distinct basement-membrane. The enclosed cavities differ 17. Section of thyroid body, exhibiting de-tail of the acini, which are cut in variousdirections: c, colloid material distendingthe larger acini ; /, interacinous connectivetissue; v, blood-vessels. 25g NORMAL HISTOLOGY. according to the size and the distention of the acini; they usually con-tain a viscid yellowish mass, the colloid substance, produced through the active agency of the cells lining theFig. 293. acini. In addition to the characteris- tic colloid secretion, detached epithe-lium, leucocytes, migrated plasma-cells, and in very many cases coloredblood-corpuscles, are included withinthe contents of the alveoli. The pres-ence of red blood-cells in various stagesof disintegration has suggested thedestruction of effete blood-cells as apossible function, in part at least, ofthis questionable organ. The inter-alveolar tissue contains elements closelyresembling plasma-cells. The blood-vessels of the thyroidgland are exceptionally numerous, the arteries being remarkable fortheir large
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
