This fetal pig snout contains excellent examples of mesenchyme.
Mesenchyme is an early form of connective tissue found in embryos. It is composed of mesenchymal cells and ground substance. Mesenchymal cells can differentiate into other cell types such as fibroblasts, fat, cartilage and bone.
Skin - a stratified squamous epithelium that covers the specimen. This fetal epithelium is very hydrated giving it an unusual, "fluffy" appearance.
Cartilage - the two large, oval structures near the midline with sparse cells.
Bone - basophilic spicules often with cells on their surface..
Tooth - a protrusion of tissue that will develop into a tooth.
Mesenchyme is found between these differentiating tissues.
Mesenchymal Cells - stellate or spindle-shaped (fusiform) cells with round to oval nuclei. Easy to identify when three or more processes are visible.