MUSCLES OF THE NECK AND TRUNK 105 



one on to the oblique muscle next but one in front. Behind 

 these slips, which were obvious, there were indications of 

 additional slips both in front and behind, but these were 

 not sufficiently differentiated from the adjacent muscles for 

 separate description. 



Lung its Cera ids. This median muscle arises from the 

 forward continuation of the longissimus dorsi and from the 

 median underlying part of the spinalis complex. 



Spinalis Complex. This system of muscles lies deeper 

 than the foregoing. It is divisible into three parts. Part I. 

 (sometimes called the spinalis dorsi) arises apparently only 

 from the longissimus dorsi ; it gives off six fleshy bellies 

 which increase in length from the posterior to the anterior ; 

 they are inserted on to the upper posterior surface of the 

 oblique processes of cervicals x.-xvi. In addition the 

 superior fibres from these heads form a well-marked rounded 

 muscular cord, which runs forward to form the longus colli 

 posticits. Part II. consists of only four well-differentiated 

 slender bellies ; these arise from the spinous processes of 

 cervicals xm.-xv., and they are inserted on to a continuous 

 longitudinal band, the posterior part of which sends slips 

 to the three posterior branches of the spinalis dorsi, while 

 the anterior end is inserted on to the oblique processes of 

 cervicals x., XL, at the roots of the anterior two spinalis 

 dorsi bellies. Part III. (longus colli posticits) arises from the 

 sides of the spinous processes of cervicals II.-XL, and from 

 part I. of the spinalis complex ; it is inserted by digitations 

 which merge with the intervertebral muscles in front of its 

 origins. It has been specially described and figured by 

 GARROD for Plot its. 



Eectits Cap it is Posticits. It arises from the spinous 

 process of atlas and axis ; its fibres spread out over the 

 occipital under the complexus. 



Intertransver sales. These muscles are obvious all the 

 way along from the ilium to the neck, running between the 

 transverse processes of the vertebrae. 



Obliqui (Transverso-spinales}. They are clearly differen- 

 tiated only from the last to the seventh cervical. They are 



