Septum Transversum

The septum transversum (ST) forms from an aggregation of mesenchyme tissue that develops within the caudal part of ventral mesentery of the foregut. This compartment gives rise to the partition of the coelom, part of the diaphragm, stomach and duodenum. ST separates heart from the developing liver. During its early development, a major portion of the liver is embedded in the Septum Transversum.