416 



THE MUSCLES 



Fig. 306.— The Fifth Layer of the Muscles of the Back. 



Complexus 

 Trachelo-mastoid 



TrauBversalis colli 



Cervicalis aseendens 



Longissimus dorsi 



Aceessorius ad ilio- 

 costalem 



Spinalis dorsi 



Ilio-costalis 



Obliquus internus 



Ei-eetor spinas 



SEVENTH CERVICAL VERTEBRA 



_ TWELFTH THORACIC VERTEBRA 



FIFTH LUMBAR VERTEBRA 



3. ACCESSORIUS AD ILIO-COSTALEM 



The aceessorius ad ilio-eostalem or ad saero-lumbalem — named from its 

 beinp; an acccssorv or addition to tlie ilio-costalis — is a narrow niiisculo-tendinous 

 l)aiid with a serrated niaruin on either side. 



