. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. Fig. 3917.—A. Situation, Relations, and Form of the Thymus Gland: 1, right lobe; 2. leftlobe ; 3, furrow between the lobes; 4, lung; 6, thyroid body ; 7, trachea ; 10. internal jugu-lar vein ; 11, common carotid artery ; 12, pericardium. B. Right Lobe of the Thymus afterRemoval of its Sheath. C. The Gland Unravelled, showing the lobules, 3, grouped round acentral cord, 4. (After Sappey—figured in Quains Anatomy.) ment, being scarety ever distinguishable after the
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. Fig. 3917.—A. Situation, Relations, and Form of the Thymus Gland: 1, right lobe; 2. leftlobe ; 3, furrow between the lobes; 4, lung; 6, thyroid body ; 7, trachea ; 10. internal jugu-lar vein ; 11, common carotid artery ; 12, pericardium. B. Right Lobe of the Thymus afterRemoval of its Sheath. C. The Gland Unravelled, showing the lobules, 3, grouped round acentral cord, 4. (After Sappey—figured in Quains Anatomy.) ment, being scarety ever distinguishable after the twenty-fifth year. Besides these variations, due simply to the age of thesubject, it has been observed to become smaller in conse-quence of active exercise, and to be again increased insize after rest and overfeeding. Structure.—The thymus is fixed in the anterior medi-astinum by means of loose areolar tissue, rich in elastic. Fig. 3918.—Section of a Portion of the Thymus Gland, seen under a LowPower, a, Fibrous tissue between the lobules; 6, cort«x ; e, medullaryportion. (Kleins Elements of Histology.) fibres, which forms a sheath or envelope enclosing it (in-volucrum), at the same time sending prolongations whichpass between the lobules and which contain the vesselsand lymphatics. The lobules resemble lymph-glands in structure, eachconsisting of several follicles, from which on section amore or less abundant milky juice exudes, containingfinely divided fat, compound granule-cells, and a few leucocytes. Under a low power the tissue of thelobule in the main resembles that of acompound lymphatic gland, but presentsthe peculiarity of each follicle being di-vided into two zones : an outer, opaqueportion (cortex), and an inner, translucent(medulla). The cortex consists of ordinary finelyreticulated lymphoid tissue, the meshesof which are filled with leucocytes. The medulla is distinguished by thepresence in
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
