Manual of human histology . layers are com-posed of common, undulating connectivetissue, with fine, loosely arranged, or ratherisolated elastic fibres (nucleated fibres, asthey are termed), and of a large quantity of smooth muscles,the fusiform elements of which, 0-02—OO^ long, and 0-004—0-007 broad, present the usualcharacters of contractile fibre-cells, whilst the longitudinallaminae consist of true, thick, andvery thick, reticulated e/fl!s/«c respect to the mutual rela-tions as laminae of these tissues, itshould be remarked that in cer-tain veins ^popliteal, profundafemoris, sap
Manual of human histology . layers are com-posed of common, undulating connectivetissue, with fine, loosely arranged, or ratherisolated elastic fibres (nucleated fibres, asthey are termed), and of a large quantity of smooth muscles,the fusiform elements of which, 0-02—OO^ long, and 0-004—0-007 broad, present the usualcharacters of contractile fibre-cells, whilst the longitudinallaminae consist of true, thick, andvery thick, reticulated e/fl!s/«c respect to the mutual rela-tions as laminae of these tissues, itshould be remarked that in cer-tain veins ^popliteal, profundafemoris, saphena major and minor),the t. intima is succeeded by alayer, formed solely of connec-tive tissue and finer elastic net-works, and having a longitudi-nal fibrillation—the longitudinallamina of the t. media—whilstin other veins the muscularelements extend also into theinnermost lamina. In this case,immediately external to the t. intima, there is a transverselayer of muscles, with connective tissue and elastic Fig. 284. Transverse section of the vena saphena magna, at the malleolus, x 30diam.: a, striped lamellce and epithelium of the f. intima; b, its elastic membrane; c, longitudinal, internal connective-tissue layer of the t. media,-with elastic fibres; d, transverse muscles, and e, longitudinal elastic networks, disposed in a laminatedmanner; /, t. adventitia. Fig. 285. Muscular fibre-cells from the renal vein of Man: a, without; h, with,acetic acid; a, nucleus of the latter; x 350 diam. 304 SPECIAL HISTOLOGY. which three tissues, in these veins, always accompany eachother; to this succeeds a regular alternation of longitudi-nal, elastic, reticulated membranes, always in a single layer,and transverse muscles with connective tissue, so that thet. media of these veins presents a laminated aspect, somewhatresembling that of the largest arteries. It should, however, beremarked, that the elastic, reticulated membranes, althoughfrequently very closely interwoven, n
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
