W I *CLES OF THE TW\ l< 1 ! I 



4. The Great Comj.h,;,*. (Fig. 106, 6, 7.) 

 ing. Dorso-occipitulis Gininl. (Com plena major Pereivall.) 



Situation Din-i-timi Form. A powerful muscle, included between the 

 internal surface of the splenius and the cervical ligament, whose obliqno 

 din ction forwards and upwards it follows ; it is triangular, flattened on both 

 sides, elongated from before to behind, and divided longitudinally into two 

 unequal portions a posterior and anterior. 



x ,-itctnre. The posterior portion (Fig. 106, 6), the most considerable, 

 is apoiu'urotic at its origin, intersected by linear fibrous bands which obliquely 

 cross its direction, and is formed of fleshy fibres directed forwards. Those 

 which ci impose the anterior portion (Fig. 106, 7), intermixed with gome 

 tendinous fasciculi, are directed upwards, and appear to be inserted into the 

 ling. It is this difference in the direction of the fibres of the two 

 portions of the great complexus which allows them to be distinguished from 

 one another ; the two being only really separated by an interstice near their 

 inferior extremity. Superiorly, the muscle is constricted to form the 

 summit of the elongated triangle it represents, and terminates by a strong 

 tendon, 



-. The posterior portion derives its origin: 1, From the 

 summit of the spiiious processes of the first dorsal vertebrae, by a strong 

 aponeurosis which is confounded with that of the splenius and the anterior 

 small serratus ; 2, From the transverse processes of the four or five dorsal 

 vertebrae which follow the second, by as many aponeurotic digitations united 

 by their margins. The anterior portion is fixed : 1, To the transverse 

 processes of the two first dorsal vertebrae, by two tendinous digitations 

 analogous to those of the posterior portion ; 2, To the articular tubercles of 

 the cervical vertebrae, by the inferior extremity of its fleshy fasciculi. 



Movable insertion. The movable insertion of the great complexus is 

 effected through its superior tendon, which is fixed to the posterior face of 

 the occipital protuberance, beside the cervical tuberosity. 



lions. It is covered by the splenius and the small complexus. It 

 covers the cervical ligament, the upper branch of the ilio-spinalis, the trans- 

 verse spinous of the neck, and the oblique and posterior straight muscles of 

 tin- head. The aponeurotic digitutions which attach it to the dorsal trans- 

 verse processes are comprised between the two branches of the ilio-spinalis. 

 The interstice which separates, inferiorly, the two portions of the muscle 

 affords a passage to the superior cervical artery. 



Action. It is a powerful extensor of the head. 



5. Small Complexus. (Figs. 105, 6, 7 ; 106, 8, 9.) 

 Synonyms. Dorao-mastoideus Girartl. ( 7W/ />;/<>i>7->/r/tM Fercicall.) 



Situation Direction. Situated at the internal face of the splenius, in an 

 oblique direction upwards and forwards, this mu>. ! lii-s along the anterior 

 border of the great complexiis, and follows the inferior branch of the ilio- 

 spimilis, which it appears to continue to the head. 



Stni'-tnre. The small coinplexus is a long muscle, divided into 

 two fleshy, fusiform, and parall ! portions ant; rior and posterior -which we 

 inL'lit strictly consider as two distinct muscles. Buth are composed of 

 successive fasciculi, which become longer as they are superficial, and 

 terminate by a tendon at their superior extremity. The t< ndon ( ,f the 

 posterior muscle is flattened, and joins the mastoid aponcurosis of the 



