. Text-book of normal histology: including an account of the development of the tissues and of the organs. ose of the tongue, lie embedded on the posterior surface of theepiglottis. The tunica propria of the larvnx is composed of fibrous connec-tive tissue, with which is mingled an especially rich net-work of elasticfibres ; in the true vocal cords, almost the entire membrane con-sists of longitudinal bundles of elastic tissue ; these cords, therefore,are folds of the mucosa, composed principally of elastic fibres, withsome fibrous tissue, covered by stratified squamous epithelium andre-enforc
. Text-book of normal histology: including an account of the development of the tissues and of the organs. ose of the tongue, lie embedded on the posterior surface of theepiglottis. The tunica propria of the larvnx is composed of fibrous connec-tive tissue, with which is mingled an especially rich net-work of elasticfibres ; in the true vocal cords, almost the entire membrane con-sists of longitudinal bundles of elastic tissue ; these cords, therefore,are folds of the mucosa, composed principally of elastic fibres, withsome fibrous tissue, covered by stratified squamous epithelium andre-enforced externally by the fasciculi of the thyro-arytenoideus mus-cle. In addition, large numbers of leucocytes lie scattered through-out the mucosa ; in the posterior surface of the epiglottis, the falsecords, and the ventricle of the larynx the leucocytes are so numerous THE RESPIRATORY ORGANS. 247 that the mucosa assumes the character of diffuse adenoid tissue. The superficial part of the tunica propria is beset with papillae, bestdeveloped in those regions which are covered with squamous epi- FiG. Longitudinal section of larynx of child, exhibiiing vocal cords and ventricle : a, surface above falsecord (6) covered with squamous epithelium; c, true cord covered with squamous epithelium; y, ven-tricle lined with ciliated columnar epithelium; j, ducts of mucous glands (g) cut in various direc-tions ; VI, fibres of thyro-arytenoideus muscle. thelium. The deeper layer of the mucous membrane is of loosestructure, and passes into the still looser tissue of the submucosa,which serves to attach the mucous membrane with the surroundingfirmer structures. In places the submucous tissue contains mucousfollicles, .2-1 mm. in length, lined with columnar cells, many ofwhich are distended with mucous secretion, even to the condition of
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