Mesenchyme consists of a network of branching cells, in the meshes of which is a homogenous intercellular fluid. The processes of a cell appear to anastomose with those of other cells.
As development progresses, wavy primitive fibres appear between branching cells and the fluid matrix becomes viscid due to formation of mucoproteins. This developmentally more nature tissue is mucous connective tissue which is widely distributed in the embryo.
The primitive fibres later become collagenous. Elastic fibres appear later classical example of mucous connective tissue is umbilical cord and the term Wharton’s jelly is applied to it in that location.
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