Development of the Heart: Derivatives

Heart

• Sinus venosus (R horn): smooth part of right atrium (sinus venarum) and the "valve" of the superior vena cava. The sino-atrial node.
• Sinus venosus (L horn): coronary sinus, valve of coronary sinus
• Valve of sinus venosus (R): border of smooth part of right atrium (crista terminalis)
• Valve of sinus venosus (L): part of atrial septum
• Common atrium: rough part of right and left atria and the auricles
• Embryonic pulmonary vein: large part of the left atrial wall
• Septum primum: left side of the atrial septum
• Septum secundum: right side of the atrial septum
• Foramen secundum: dimple in the atrial septum seen from left side (fossa ovalis, ok)
• Foramen ovale: fossa ovalis
• Endocardial cushions: parts of the atrioventricular wall, mitral, and tricuspid valves
• Endocardial cushions: membraneous part of ventricular septum, part of arterial trunk
• Bulbus cordis: trabeculated part of R ventricle and aortic vestibule of L ventricle
• Truncus arteriosus: ascending (ventral) aorta and pulmonary artery
• Common ventricle: parts of the right and left ventricle

Arterial System

• Aortic sac (R and L sides of sac): brachiocephalic artery (right) and part of the ascending aorta (left), large parts of common carotid arteries
• 1st aortic arch (R and L): part of the maxillary artery and external carotid arteries
• 2nd aortic arch (R and L): part of the hyoid and stapedial arteries, part of external carotids
• 3rd aortic arch (R and L): part of common carotids and first part of the internal carotids
• 4th aortic arch (R): small proximal part of the right subclavian artery
• 4th aortic arch (L): small part of arch of the aorta just proximal to the left subclavian artery
• 6th aortic arch (R): proximal part of right pulmonary artery
• 6th aortic arch (L=ductus): proximal left pulmonary artery and and ligamentum arteriosum
• Ductus arteriosus: ligamentum arteriosum
• Dorsal aorta (R and L): part of right subclavian, descending aorta below left subclavian
• Unpaired ventral (or vitelline) arteries: celiac, superior mesenteric, and inferior mesenteric arteries
• Paired dorsal segmental arteries: intercostal arteries and vertebral arteries
• Umbilical arteries: internal iliac, superior vescial arteries, medial umbilical ligaments

Venous System

• Ductus venosus: ligamentum venosum
• Umbilical vein (L): round ligament (ligamentum teres)
• Vitelline vein (R): superior mesenteric vein and the inferior vena cava
• Vitelline vein (L): most of the portal vein
• Anterior cardinal veins (R and L): internal jugular veins (left brachiocephalic vein is an anastomosis)
• Anterior cardinal vein (R): part of superior vena cava and right brachiocephalic vein
• Common cardinal vein (R): proximal part of superior vena cava
• Common cardinal vein (L): lateral part of coronary sinus and oblique vein of left atrium
• Posterior cardinal vein (R): part of azygos vein and common iliac veins
• Supracardinal veins: hemiazygos vein (L) and caudal part of azygos vein (R)
• Subcardinal vein (R): renal segment of inferior vena cava