380 



connecting it with its 

 fellow of the opposite 

 side (called ' ligamen- 

 tum nuchoe'by Meckel), 

 and is inserted into the 

 spine (' margo anterior 

 scapulae,' Meckel) and 

 acromion process of the 

 scapula, and into the 

 outer half of the cla- 

 vicle. 



The ldtissi?nus dor si, 

 a very long and broad 

 muscle, arises from the 

 spines of all the dorsal 

 and lumbar vertebrae, 

 and from the eleven 

 posterior ribs; it is in- 

 serted by a broad and 

 strong tendon into the 

 distal half of the ulnar 

 margin of the luimerus. 

 At its anterior part this 

 muscle may be sepa- 

 rated into a superficial 

 and deep stratum. 



The rhomboideus is a 

 single muscle, but thick 

 and long, extending 

 from the occiput to the 

 narrow base of the sca- 

 pula. 



The splenius is united 

 by an intermediate ten- 

 don with the opposite 

 muscle, and is inserted 

 into the mastoid pro- 

 cess. 



The biventer cervicis 

 and the co?nplexus are 

 distinct throughout their 

 whole course, which ex- 

 tends from the anterior 

 dorsal and posterior cer- 

 vical spines to the occi- 

 put ; the complexus is 

 the longest and thickest 

 muscle, and divides into 

 an external, shorter, and 

 deeper-seated portion, 

 and an internal, longer, 

 and superficial portion. 



The sacrolumbalis ari- 

 ses from the dorsal ex- 

 tremity of the ilium, is 

 attached to the ribs, over 

 which it passes in its 

 course to its insertion 

 into the transverse pro- 

 cesses of the four or five 

 posterior cervical verte- 

 brae. 



The longissimus dorsi 

 is a much thicker and 

 narrower muscle, and 

 extends from the dorsal 

 aspect of the sacrum 

 along the spine to the 

 third or fourth cervical 

 vertebra. 



MONOTREMATA. 



Fig. 180. 



Muscular system, ventral aspect. Ormthorhynchut paradomu, (Meckel.) 



