412 



THE MUSCLES 



Nerve-supply. — From the second and third intercostals by fine filaments 

 which enter the outer part of its deep surface. 



Fig. 305.— The Third and Foueth Layers of the Mi'scles of the Back. 



Complexus 



Splenius capitis 



Splemus colli 



Ssrratus post'Cus superior 



Vertebral aponeurosis 



Serratus posticus 

 inferior 



Obliquus internus 



Origin of latissimus 

 dorsi 



SEVENTH CERVICAL VERTEBRA 



TWELFTH THORACIC VERTEBRA 



FIFTH LUMBAR VERTEBRA 



Action. — To raise the ribs into Avhich it is inserted; and tlierefore to assist in 

 inspiration. 



