"The term mesenchyme is often used to refer to the morphology of embryonic cells that, unlike epithelial cells, can migrate easily. Epithelial cells are polygonal, polarised in an apical-basal orientation, and organised into closely adherent sheets 3. Mesenchyme is characterised by a matrix that contains a loose aggregate of reticular fibrils and unspecialized cells capable of developing into connective tissue: bone, cartilage, lymphatics and vascular structures 4."