. Quain's elements of anatomy . tissue, being connected here andthere by transverse branches, and in addition to these vessels the lymphmay be conveyed by means of the elongated areolae of the same blood-vessels nor lymphatic vessels actually penetrate into thesmall bundles of elastic fibres, although the lymphatic vessels often lieclose against the surface of the bundles. RETIFOEM TISSUE. 69 SPECIAL VAEIETIES OP CONNECTIVE TISSUE. 1.—At an early period of development connective tissue consists of apellucid jelly and nucleated corpuscles. The soft watery jelly containsthe chemic
. Quain's elements of anatomy . tissue, being connected here andthere by transverse branches, and in addition to these vessels the lymphmay be conveyed by means of the elongated areolae of the same blood-vessels nor lymphatic vessels actually penetrate into thesmall bundles of elastic fibres, although the lymphatic vessels often lieclose against the surface of the bundles. RETIFOEM TISSUE. 69 SPECIAL VAEIETIES OP CONNECTIVE TISSUE. 1.—At an early period of development connective tissue consists of apellucid jelly and nucleated corpuscles. The soft watery jelly containsthe chemical principle of mucus, or mucin, and, in much less proportion,albumin, but not gelatin. In the general course of development of thetissue, fibres, both white and elastic, are formed in the soft matrix, andfinally obscure or obliterate this substance in a great measure. But incertain cases the course is dificrent. The cells may disappear, only thejelly remaining, as in the vitreous humour of the eye; or the corpuscles Fig. Fig. 71.—Jelly of Wharton (Ranvier) r, ramified cells intercommunicating by their branches ; I, a row of leucocytes ormigratory cells ; /, /, fibres coursing through the ground-substance. may branch out and join together in form of a network in the jelly, withthe nuclei persisting at the spots whence the threads diverge. Theareolar tissue surrounding and imbedding the vessels in the umbilicalcord of the foetus consists of fusiform and ramified corpuscles asso-ciated with white fibrillar bundles and elastic fibres, along with aquantity of the original soft matrix, which is persistent at the time ofbirth. The tissue is here known as the jelly of Wharton (fig. 71). Connective tissue of this nature is known as jellylike or mucoustissue. 2.—In other cases the matrix disappears or liquefies: and the ramifiedcorpuscles unite together into a reticular or fine trabecular structure(fig. 72): either retaining their nuclei as at a, or losing them and thenformin
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