Licence: Public Domain Mark
Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.
Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.
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![connected into networks within the bundle, are to be found in large numbers in the walls of the alveoli of the lung, in the ligamenta flava, in the ligamentum nucha3 of the ox (in which the fibres are exceedingly thick cylinders), in yellow elastic car- tilage {see below), in the endocardium and valves of the heart, and in the vascular system, particularly the arterial division. In the latter organs the intima, and also to a great extent the media, consist of elastic fibrils densely connected into a network. 52, The following are special morphological modi- fications of the elastic fibres: {a) elastic fenestrated membranes of Henle, as met with in the intima of the big arteries; theSe are in reality networks of fibres with very small meshes, and the fibres unusually broad and flat. (b) Homogeneous elastic membranes, which surround, as a delicate sheath, the connective tissue trabeculae in some localities, e.g., subcutaneous tissue, (c) Homogeneous-looking elastic membranes in the cornea, behind the anterior epithe- lium as Bowman's anterior elastic membrane, and at the back of the cornea as elastica posterior, or Descemet's membrane ; in the latter bundles of minute fibrils have been observed. (d) Elastic trabeculfe forming a network, as in the ligamentum pectinatum iridis. In the embryonic state the elastic fibres are nucleated, the nuclei being the last remnants of the cells from which the fibres develop, one cell generally giving origin to one fibre. These nucleated fibres are called Henle's nucleated fibres. 53. Special varieties of fibrous connective tissue are these : (1) Adenoid reticulum. This is a network of fine fibrils, or plates, forming the matrix of lym])hatic or adenc'-^ tissue. {See Lymphatic glands.) The reticulum is not fibrous connective tissue nor elastic tissue; it contains nuclei in the young state, and is derived from](https://iiif.wellcomecollection.org/image/b24757238_0067.jp2/full/800%2C/0/default.jpg)
