80 ANATOMY. 



Rotatores Spinse (n), from the transverse processes of the dorsal vertebrae, 

 from the 2d to the I2th inclusive, each into the lamina of the next dorsal 

 vertebrae above. Action, to rotate the spinal column. Nerves, branches of 

 the dorsal. 



Supra-spinales, lie on the spinous processes in the cervical region. Nerves, 

 branches of the cervical. 



Inter-spinales placed in pairs between the spines of contiguous vertebrae, 6 

 pairs in the cervical region, 3 in the dorsal, 4, sometimes 6, in the lumbar. 

 Nerves, posterior spinal branches. 



Inter-transversales, 18 placed between the transverse processes of contigu- 

 ous vertebrae, 7 in the cervical region, 12 in the dorsal, and 4 in the lumbar. 

 Nerves, posterior spinal branches. 



Rectus Capitis Posti'cus Major, 13 from the spine of the axis, into the infe- 

 rior curved line of the occipital bone and the surface below. Action, to 

 rotate the head. Nerves, sub- and great occipital. 



Rectus Capitis Posti'cus Minor, 12 from the tubercle on the posterior arch 

 of the atlas, into a rough surface between the foramen magnum and the 

 inferior curved line of the occipital bone. Action, to draw the head back- 

 wards. Nerves, sub- and great occipital. 



Obliquus Capitis Inferior, 15 from the spinous process of the axis, almost 

 horizontally to the transverse process of the atlas. Action, to rotate the 

 atlas and cranium. Nerves, sub- and great occipital. 



Obliquus Capitis Superior, 14 from the transverse process of the atlas; 

 upwards and inwards into the occipital bone between the curved lines. 

 Action, draws the head backwards. Nerves, sub- and great occipital. 



Extensor Coccygis, from the last bone of the sacrum or first of the coccyx, 

 into the lower part of the coccyx, posteriorly. Action, as named. Nerves, 

 posterior sacral branches. 



MUSCLES OF THE ABDOMEN. 



External Oblique, 12 from 8 lower ribs by 8 fleshy digitations, into the an- 

 terior half of the outer lip of the crest of the ilium, and by a broad aponeu- 

 rosis, 13 into the ensiform cartilage, linea alba, symphysis, and spine of the 

 pubes, and the pectineal line. Its aponeurosis is continuous with that of the 

 pectoralis major above, and below it forms Poupart's 14 and Gimbernat's 

 ligaments, and by the separation of its fibres, the external abdominal ring. 15 

 Action, to compress the viscera, and flex the thorax on the pelvis, and vice 

 versa. Nerves, lower intercostal, ilio-hypogastric, and ilio-inguinal. 



Internal Oblique, 18 from the lumbar fascia, the anterior two-thirds of the 

 middle lip of the crest of the ilium, and the outer half of Poupart's liga- 



