Changes

==Great Vessels==

==Great Vessels==

===Pulmonary Circulation===

===Pulmonary Circulation===

Deoxygenated blood from the right ventricle flows to the lungs via the arteries of the pulmonary circulation.  These include the pulmonary trunk and pulmonary arteries. The '''pulmonary trunk''' begins at the right ventricle, from which it is separated by the cusps of the pulmonary valve. It passes between the auricles and continues to the left of the aorta in a caudal direction. It attaches to the aorta by the '''ligamentum arteriosum''', which is a remnant of the foetal [[Foetal Circulation - Anatomy & Physiology|ductus arteriosus]].  Just ventral to the tracheal bifurcation, the pulmonary trunk gives rise to the '''left and right pulmonary arteries'''. These arteries supply the left and right lungs, respectively. The pulmonary arteries then branch, with the smaller branches following the bronchi until they terminate at the capillary networks surrounding the alveoli. The '''pulmonary veins''' begin at these alveolar capillary networks and transport oxygenated blood to the left atrium.

Deoxygenated blood from the right ventricle flows to the lungs via the arteries of the pulmonary circulation.  These include the pulmonary trunk and pulmonary arteries. The '''pulmonary trunk''' begins at the right ventricle, from which it is separated by the cusps of the pulmonary valve. It passes between the auricles and continues to the left of the aorta in a caudal direction. It attaches to the aorta by the '''ligamentum arteriosum''', which is a remnant of the foetal [[Foetal Circulation - Anatomy & Physiology|ductus arteriosus]].  Just ventral to the tracheal bifurcation, the pulmonary trunk gives rise to the '''left and right pulmonary arteries'''. These arteries supply the left and right [[Equine Lower Respiratory Tract - Horse Anatomy#Lungs|lungs]], respectively. The pulmonary arteries then branch, with the smaller branches following the bronchi until they terminate at the capillary networks surrounding the alveoli. The '''pulmonary veins''' begin at these alveolar capillary networks and transport oxygenated blood to the left atrium.

===Systemic Circulation===

===Systemic Circulation===