Manual of human histology . THE BLOOD VESSELS. 291. transitionary forms are here met with ; and besides this, we maynotice every degree of transformation of the latter, or of theelastic reticulated membranes into trueelastic membranes, which either betraytheir derivation, in an elastic, more orless indistinct, fibrous network per-vading them, and distant openings, orare transformed, either partially or en-tirely, into perfectly homogeneous plates,exhibiting more or fewer openings (, vol. I, p. 62). In the smallest vessels,instead of the elastic elements, thereoccasionally occur, especial
Manual of human histology . THE BLOOD VESSELS. 291. transitionary forms are here met with ; and besides this, we maynotice every degree of transformation of the latter, or of theelastic reticulated membranes into trueelastic membranes, which either betraytheir derivation, in an elastic, more orless indistinct, fibrous network per-vading them, and distant openings, orare transformed, either partially or en-tirely, into perfectly homogeneous plates,exhibiting more or fewer openings (, vol. I, p. 62). In the smallest vessels,instead of the elastic elements, thereoccasionally occur, especially in the/. adventitia, fusiform cells, which canonly be regarded as undeveloped forma-tive cells of elastic tissue. Transverselystriped muscle is found only at the openings of the largest veins into the heart; whilst, on the con-trary, smooth muscles are extensively distributed, especially invessels of a medium size, and also to some extent in the largervessels. The elements of these muscles, or the contractile fibre-cells, in the majority of the
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
