FEOG 221 



neighbors by cutting the connective tissue which 

 binds them together, and endeavor to make out 

 its shape, the direction of its fibres, its origin, its 

 attachment, and the motion which it produces. 

 Use the articulated skeleton for comparison. 

 Make the drawings necessary to show the posi- 

 tion and arrangement of the parts. This may 

 usually be done by drawing on one side of the 

 body the superficial, and on the other side the 

 deeper muscles. 



Only the more important muscles are given. 

 Examine them in the following order : 



I. The muscles of the trunh. 



Pin the frog down on its back, and notice that 

 a certain group of muscles covers the ventral 

 side of the body. 



a. The pectoralis, fan-shaped, running from the 

 sternum to the shoulder, and consisting of sev- 

 eral parts. Where does each part originate ? 

 Find one part extending down upon the abdo- 

 men. Are all of the parts inserted at the same 

 point ? 



h. The rectus abdominis, running from the pu- 

 bis. E^ote the linea alba, which separates the 

 two recti. Of what is the linea composed? 

 JSTote also the transverse division of each rectus 

 into parts or bellies. How many such parts 

 are there? What is the relation of the anterior 

 end of this muscle to the pectoralis ? 



Eemove the two muscles just examined and 

 find 



c. The oblique muscles, covering the sides of 

 the abdomen. The obliquus externus, with 



