214 ADVANCED LESSONS IN PRACTICAL PHYSIOLOGY 



alba. Identify the pyloric sphincter and duodenum. Note the posi- 

 tion, shape, color, etc., of the pancreas. Inspect the body of this organ. 

 Note how closely it invests the duodenum. Identify the duct of Wir- 

 sung. Open the duodenum in this region and locate the papilla through 

 which the pancreatic and common bile-ducts discharge their contents. 

 Insert a straight glass cannula in this orifice, and place a clip upon the 

 common duct farther distally. 



Adjust the mouth of the cannula so that the drops of pancreatic 

 secretion may fall upon the spoon of a receiving tambour. By means 

 of narrow rubber tubing connect this tambour with a recording drum 

 registering the number of drops upon the paper of a slowly revolving 

 kymograph. Add a time-curve. 



3. Action of Secretin. Expose the right external jugular vein and 

 insert a cannula in its central end (see Lesson X). Slowly inject 50 c.c. 

 of the activated preparation of duodenal mucosa. Register the drops 

 of pancreatic juice in the manner just described. Compare the results. 

 Disconnect the apparatus. 



4. Gastro-enterostomy. Procure curved needles, catgut, and oper- 

 ating instruments. Select a segment from the upper portion of the 

 jejunum. Bring its flat surface against the region of the greater curva- 

 ture of the stomach, avoiding the blood-vessels of this region. Approxi- 

 mate these surfaces, being careful to give a normal curvature to the 

 duodenum. Make an incision about 6 cm. in length in the anterior 

 wall of the stomach at a safe distance from the blood-vessels passing 

 along the greater curvature. Make a similar incision in the convex 

 side of the loop of the jejunum. Suture the two orifices in apposition, 

 first by an external serous suture carried along one side of the orifice 

 and then by an internal rqw of sutures embracing the mucosa. Repeat 

 on the other side in the reverse direction. What is the purpose of this 

 operation? Discuss physiologic points for and against this operation. 

 Under what circumstances may it produce beneficial results? Kill the 

 animal by an overdose of ether. 



