THE MUSCLES 



I2 9 



(Figs. 124, 125). Which is used in striking a blow, the 

 biceps or the triceps ? 



218. The sartorius ("tailor") muscle (Fig. 126) is nearly 

 two feet long and is the longest muscle in the body ; it passes 

 from the outer side of 



the hip bone to the inner 

 side of the leg below the 

 knee, and is used in 

 crossing the leg; because 

 of the position assumed 

 by a tailor at work it is 

 named the tailor's mus- 

 cle. The gastrocnemius 

 is a thick muscle in the 

 calf of the leg, and raises 

 the heel (Fig. 125). 

 When is it used ? It is 

 attached to the heel by 

 the largest tendon in the 

 body, called the "tendon 



Of Achilles." Ask the Fia 124- - Superficial View of Muscles of 



Upper Part of Trunk, from the front, 

 teacher why it IS SO (Allen Thomson.) 



called ; or read the story 

 of Achilles. 



219. The trapezius 

 ("four-sided") (Figs. 

 123, 125) is a large 



muscle covering the back between the shoulders. It 

 draws the shoulders back and holds up the head. Can 

 you find the climbing muscle (Figs. 123, 124), or the 

 muscle that draws the arm backward and downward (latis- 

 simus or "broadest")? When a person hangs by the 

 hands, it helps to raise the body. It is a large spread- 

 out muscle extending from the humerus to the vertebral 

 column. 



sterno-mastoid of the left side; 5, trapezius ; 6, 

 deltoid ; 7, upper part of triceps in the left arm ; 

 10, latissimus dorsi ; n, pectoralis major ; n', on 

 the right side, its clavicular portion ; 12, part of 

 pectoralis minor ; 13, serratus magnus ; 14, ex- 

 ternal oblique muscle of the abdomen ; 15, placed 

 on the tip of the sternum. 



