LESSON XXIII 

 THE CIRCULATION (Continued) 



THE VASOMOTOR ACTION OF THE GREATER SPLANCHNIC NERVE. 

 THE VASCULARITY OF THE KIDNEY. ONCOMETRY 



1. The Greater Splanchnic Nerve. Anesthetize a cat and maintain 

 deep anesthesia throughout the following experiments : Perform trache- 

 otomy. Insert a straight cannula in the left common carotid artery 

 and arrange the apparatus for recording the blood-pressure. Make a 

 median incision through the skin of the abdomen and incise the linea 

 alba. Introduce the middle and index-fingers of your left hand through 

 this opening and by using them as a guide enlarge the incision upward 

 as far as the ensiform cartilage, and downward as far as the region of 



JC 



FIG. 79. REGION OF LEFT KIDNEY. 



JC, Inferior vena cava; R V, renal vein; K, kidney; SC, left adrenal body with cor- 

 responding vein; S, greater splanchnic nerve; A, abdominal sympathetic nerve; M, minor 

 splanchnic nerves, from lumbar ganglia to suprarenal plexus below adrenal body; D, 

 diaphragm; TS, thoracic sympathetic nerve. 



the bladder. Apply a cloth moistened with warmed saline solution to 

 the abdomen. 



Arrange the electric apparatus for stimulation with a quickly inter- 

 rupted current of medium strength. Procure a pair of small shielded 

 electrodes and connect them with the secondary coil of the inductorium. 

 Ask the assistant to expose the region above the left kidney, holding 

 this organ and the liver away from the field of operation. Identify the 

 left suprarenal body at the junction of the left suprarenal vein with the 

 inferior vena cava. It appears as a rounded, pea-shaped mass, possess- 

 ing a pink color. With two forceps split the peritoneum and fascia 



121 



