Biology of Man 467 



III. MOTION AND LOCOMOTION IN MAN 



The living bones of the human skeleton are the passive structures to 

 which the active muscles are attached and by means of which various 

 parts of the body are moved or the body as a whole is moved from one 

 place to another (Figs. 229, 232, 233, and 249). There are over 400 



S-ternodetdomastoid' 



', V^„ PpftArali^ major 

 • • -"k (rIavicLildr portion) 



Deltoid. 



^Pectoralis rnajor 

 *f(stGrnal portion) 



II 



Spermatic Cord 



Fig. 232. — Human muscles (front view). (From Francis: Fundamentals of 



Anatomy, The C. V. Mosby Co.) 



named muscles attached to the skeleton for the movement of parts of 

 the body or for locomotion. These are the skeletal muscles and each is 

 composed of cells with several nuclei (multinucleated). Skeletal mus- 

 cles are under the control of the will (voluntary), are distinctly striated. 



