This diverticulum is lined by entoderm, and grows upward and forward into the septum transversum, a mass of mesoderm between the vitelline duct and the pericardial cavity, ...
Their nervous system consists of three pairs of ganglia. Two excretory kidneys below the heart remove ammonia waste from the pericardial cavity into the mantle cavity, from which it will leave the body.
pericardium: fibrous pericardium - serous pericardium (pericardial cavity, epicardium/visceral layer) - pericardial sinus
myocardium - endocardium - cardiac skeleton (fibrous trigone, fibrous rings)
Conduction system ...
 See also: Human, Tissue, Lungs, Embryo, Liver
  
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