FASCIA 



413 



The intrinsic musculature of the back serves to extend, bend from side to side, and to rotate 

 the spinal column and head. The muscles attached to the ribs depress the thorax. 



Fig. 380. — The Third and Fourth Layers of the Muscles of the Back. 

 (Intrinsic Dorsal Musculature) 



Semispinalis capitis 



Splenius capitis 



Splenius cervicis 



Serratus posterior superior 



Lumbo-dorsal fascia 



Serratus posterior inferior 



Obliquus internus 

 Origin of latissimus dorsi 



Seventh cervical vertebra 



Twelfth thoracic vertebra 



Fifth lumbar vertebra 



FASCI.E 



The fasciae and the general relations of the muscles of the back may be followed in the cross- 

 sections shown in figs. 347, 351, 357, 384, and 407. 



The tela subcutanea of the upper dorsal region has been described in connection with the 

 muscles of the shoulder girdle (p. 347). It is thick, fibrous, and adherent. In the lower dorsal 



