Representative images show a the fetal face of a placenta from which an umbilical cord grows as a flexible, spongy-looking, tube-like structure usually around 55 cm or 2 feet, b a transversal section of umbilical cord showing two arteries (A) and one vein (V), and c a Masson’s trichrome staining of a complete umbilical cord microsection.
Source: wiktionary