. Anatomy, descriptive and applied. Anatomy. '^^?IM' -i -. Fig. 1215.—A lobule of the thymus of a child, as seen under low power. C. Cortex, c. Concentric corpuscles within medulla, b. Bloodvessels, tr. Tra- beculse. (Schiifer.) Fig. 1216.—Elements of the thymus. ;?, 300. a. Lymph corpuscles, b. Concentric corpuscle. (Schiifer, after Cadiot.) Structure (Figs. 1195 and 1197).—Each lateral lobe is composed of numerous lobules held together by deHcate areolar tissue, the entire gland being enclosed in an investing capsule of a similar but denser structure. The primary lobules vary in size from a
. Anatomy, descriptive and applied. Anatomy. '^^?IM' -i -. Fig. 1215.—A lobule of the thymus of a child, as seen under low power. C. Cortex, c. Concentric corpuscles within medulla, b. Bloodvessels, tr. Tra- beculse. (Schiifer.) Fig. 1216.—Elements of the thymus. ;?, 300. a. Lymph corpuscles, b. Concentric corpuscle. (Schiifer, after Cadiot.) Structure (Figs. 1195 and 1197).—Each lateral lobe is composed of numerous lobules held together by deHcate areolar tissue, the entire gland being enclosed in an investing capsule of a similar but denser structure. The primary lobules vary in size from a pin's head to a small pea, and are made up of a number of small nodules which are irregular in shape and are more or less fused together, especially toward the interior of the gland. Each lobule consists of a cortical and medullary portion, which differ in many essential particulars from each other. The cortical portion is mainly composed of dense lymphoid tissue, consisting chiefly of lympho- cytes and hyaline cells supported by a delicate reticulum. In addition to this reticulum, of which traces only are found in the medullary portion, there is also a network of finely branched cells which is continuous with a similar network in the medullary portion. This network forms an adventitia to the bloodvessels. The medullary portion consists of difiEuse Isrmphoid tissue (granular cells) and concentric corpuscles (^cles of Hassal). The granular cells are rounded or flask-shaped masses attached (often by fibrillated extremities) to bloodvessels and to newly formed connective tissue. The concentric corpuscles are composed of a central mass consisting of one or more granular cells, and of a capsule which is formed of concentrically arranged epithelioid cells which seem to be continuous with the branched cells forming the net- work mentioned above. Each lobule is surrounded by a capillary plexus from which vessels pass into the interior and radiate from the periphery toward
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
