418 



THE MUSCULATURE 



surface of the squamous portion of the occipital, between the superior and inferior nuchal lines. 

 There is often a transverse tendinous inscription across the muscle opposite the sixth cervical 

 vertebra, and less frequently one between the upper and middle thirds of the muscle. These 



Fig. 382. — The Fifth Layer op the Muscles of the Back, after separating the Lonqis- 



SIMUS AND IlIO-COSTALIS DIVISIONS. 



Obliquus superior 



Rectus capitis posterior major 



Obliquus capitis inferior 



Longissimus capitis 



Longissimus cervicis 

 Ilio-costalis cervicis 



t'^W^S &if^l^^J Rectus capitis poste 



Ilio-costalis dorsi 



Ilio-costalis lumborum 



Insertion of ilio-costalis upon lum 

 bar transverse processes 



Seventh cervical vertebra 



Longissimus dorsi 



Twelfth thoracic vertebra 



Fifth lumbar vertebra 



kr Sacrospinalis 



^ — y^ t f j) 



y 



are best marked in the medial portion of the muscle, which comes from the thoracic vertebrae 

 and is soinetirnes separately dcsiMinatod as the spinalis capitis {hivenlcr cervicis). 



Nerve-supply. — It is supplied chiefly by the medial branches of the posterior divisions of the 

 first four or five cervical nerves. The muscle also gets some twigs from the lateral branches. 



