42 LABORATORY OUTLINES FOR EMBRYOLOGY 



Dorsal to the iliac arteries are the iliac veins. They 

 unite to form the ascending vena cava. From the kid- 

 neys, ventral to the renal arteries, the ascending vena 

 cava receives the renal veins. Trace the ascending vena 

 cava to the diaphragm. From where does the umbilical 

 vein receive its blood? Trace the course of this blood 

 to the heart. Where does the blood from the intestine 

 go? 



Draw a diagram of the circulation thus far worked out 

 and label all the parts.. 



b. The Thorax 



What blood vessels pass through the diaphragm? 

 The oesophagus extends from the stomach through the 

 diaphragm into the thorax. Separate the diaphragm 

 from the body wall. The masses of tissue occupying 

 the greater part of the thoracic cavity are the lungs. 

 How many lobes? Size? Shape? Position? 



What is the position of the heart? Size? Shape? 

 The heart is enclosed in a thin connective tissue sac, the 

 pericardium. The point of the heart is called the apex 

 and the other end is called the base. The firm, muscular 

 part of the heart composes the ventricles and the darker 

 colored, softer portion at the base composes the auricles. 

 Both the auricles and ventricles are called right and left, 

 according to their position. Trace the aorta to the heart. 

 Where does it enter the heart? How many arches has 

 the aorta now? The artery leading from the ventricle 

 to the lungs is the pulmonary artery. Which ventricle? 

 What is the relation of the pulmonary artery to the 



