26 PHYSIOLOGY FOR THE LABORATORY. 



Examine in the same way a piece of plain or non- 

 striated muscle. Identify the different parts of the fibre- 

 cell. Sketch. 



E. Experiments on the Student's Body. 



1. Examine carefully the back of your hand, bending and 



extending the fingers one by one. 



a. Find the different tendons or cords and follow them 

 outward. To what are they attached ? 



Notice especially: 



1. The arrangement at the knuckles. 



2. The tendon of the little finger. How is it con- 



nected with the tendon of the third finger? 

 Why? 



b. Follow the tendons inward toward the arm. 



1. Where do .they lead? Compare the tendons of 



the thumb and the little finger. 



2. Where are the muscles to which these tendons 



are attached ? Verify by placing your fingers 

 on the muscles and bending the fingers as far 

 back as possible. 



c. Sketch. 



d. Compare this with a drawing of the hand showing 

 the muscles and tendons. 



2. Notice the mass of muscles at the base of the thumb. 



Grasp a book tightly between the thumb and fore- 

 finger. What happens ? 



3. Pin a piece of paper snugly around the upper arm. Lift 



a weight to the shoulder. What happens ? Why? 



