470 Animal Biology 



part away from the median line are called abductor muscles, while those 

 which move a part toward the median line are called adductor muscles. 

 Skeletal muscles are named in various ways: (1) after the name of the 

 structure, or bone, with which they are associated {triceps hrachii. 



.Carotid Artary^ 

 .Trachea 



Subclavian V. 



Precaval V. 



Oorsiil Aorta 



Pulmonary A. 



Left Aur'ick 



Lef tVcntr/cte 



Lana 



Diaphracjin 



Liver 



Duodenum 



Stomach 



Gal/Blflddep 



Jranis/erseColon 



.Usscendlnc] Colon 

 ..Ajcendin^ Colon 



Ileum 



Fig. 235. — Human internal organs of the thoracic and abdominal cavities 

 which are separated by the muscular diaphragm (see Fig. 236). (Drawn by 

 Edward O'Malley, from Potter: Textbook of Zoology, The C. V. Mosby Co.) 



muscle on the back of the upper arm, or brachium), (2) after the num- 

 ber of "heads" with which they originate {triceps hrachii, meaning three 

 heads; biceps hrachii, two heads and located on the front of the upper 

 arm), (3) after the shape of the muscle {deltoid, delta-shaped muscle of 



