102 ANATOMY OF THE RAT 



the branches of each artery proceding dorsally on each 

 side of the column. Determine the number of lumbar ar- 

 teries, and follow them into the dorsal musculature of the 

 lumbar region. 



Exercise XXVI. Make a full-page drawing of the arteries an- 

 terior and posterior to the heart, incorporating the sketch required 

 by Exercise XV, 



