Textbook of normal histology: including an account of the development of the tissues and of the organs . next thesubmucosa, made up largely ofclose net-works of longitudinalelastic fibres. The elastic fibresare particularly robust and abun-dant along the posterior membra-nous wall of the trachea, betweenthe ends of the cartilages. The submucosa is loosely ar-ranged, and connects the mucosa with the fibrous sheath, as wellas supports the glands and larger blood-vessels, lymphatics, andnerve-trunks. The tracheal glands are represented by numeroussmall groups of racemose structures which occupy t
Textbook of normal histology: including an account of the development of the tissues and of the organs . next thesubmucosa, made up largely ofclose net-works of longitudinalelastic fibres. The elastic fibresare particularly robust and abun-dant along the posterior membra-nous wall of the trachea, betweenthe ends of the cartilages. The submucosa is loosely ar-ranged, and connects the mucosa with the fibrous sheath, as wellas supports the glands and larger blood-vessels, lymphatics, andnerve-trunks. The tracheal glands are represented by numeroussmall groups of racemose structures which occupy the submucouslayer and communicate with the mucous surface by means of thelong excretory ducts. The latter are lined with low columnarepithelium, while the acini contain cuboidal cells. The fibrous coat lies external to the submucosa and forms acomplete investment in which the cartilaginous rings are latter are C-shaped masses of hyaline cartilage, embracingalmost three-fourths of the tracheal tube. The remaining cleft isbridged by the continuation of the fibrous tunic supplemented by. I* Section embracing trachea and oesophagus ofchild : a, b, tracheal and oesophageal surfaces;c, tracheal epithelium ; (/.stroma of mucosa ; e,submucosa ; /, mucous glands ; /;, part of ringcartilage; g, its perichondrium; i, fibroustissue ; k, fibro-muscular tissue of oesophagus ;/, oesophageal epithelium. 2cq NORMAL HISTOLOGY. a layer of transversely-disposed bundles of non-striped latter extend for some little distance along the inner side of thecartilages, to whose perichondrium they are attached. The musclenot only exists between the ends of the cartilaginous plates, but alsopasses across in the intervals between these, thus constituting a con-tinuous layer, which serves to narrow the tube. In addition tothe transverse bundles, a few longitudinal muscular bands arepresent. The outer surface of the fibrous tunic is connected withthe surrounding structures by loose a
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
