THE MUSCULAR SYSTEM 



207 



strated by the fact that, in the embryos of lower vertebrates, the head 

 somites form a series of mesodermal segments continuous wilh the trunk 



TEMPORAL -f- - 



OCCIPITAL^t^"-*' 



STERNOCLEIDOMASTOID -'*•- 



TRAPEZIUS^:;^ 



SPINE OF SCAPULA >^^-\ \ 



DELTOID -i^-.> ~0, 



, EXT.POLLICIS BREVIS. 

 ABD. POLLICIS LONGUS. 



GASTROCNEMIUS 



CRUCIATE LIGAMENT. 



ACHILLES TENDONt 



Fig. 195. — Superficial muscles of human body ; back view. (Reproduced in modified 

 form from "The Human Body" by Dr. Logan Clendening (Copyright 1927, 1930 by 

 Alfred A. Knopf, Inc.) by permission of and special arrangement with Alfred A. Knopf, 

 Inc., authorized publishers.) 



somites. Like the latter, they become differentiated into myotome and 

 sclerotome, are innervated by somatic motor nerves, and are dorsal 



