234 



ANATOMY OF VERTEBKATES. 



third cervicals, and is inserted into the same part of the occipital 

 vertebra. 



The trachelomastoideus, fig. 150, 2G, arises from the hypapophyses 

 of the third and second cervicals, and ascends obliquely to be 

 inserted into the mastoid. 



The scalenus, fig. 150, 34, arises from the inner border of the 

 lower three-fourths of the scapula ; its fibres emerge as it 

 advances, and deliver strips of insertion to the diapophyses of the 

 eighth to the second cervical inclusive. 



150 



Side view of muscles of the trunk, head, and limbs, Emya Europrca. xxxvm. 



The sternomastoideus, fig. 150, 22, arises from the middle of the 

 inner surface of the entosternum, and is inserted into the mastoid. 



The diaphragmaticus, figs. 148, 149, 150, 42, 42, arises by three 

 sheets from the bodies of the fifth and fourth dorsals, and from 

 the rib of the third dorsal ; the two posterior unite to apply them- 

 selves and adhere to the mesial surface of the hniff: the third 

 sweeps over to the outer surface, 42, fig. 150, and 4 2, fig. 151, and 

 is reflected from its lower border upon the peritoneum. 



The transversalis abdominis, figs. 150, 151, 41, arises along a 

 curved line on the inner surface of the fourth, fifth, sixth, and 

 seventh costal plates, extending from the end of the fourth to the 

 beginning of the seventh ; also by a separate fasciculus from the 

 eighth rib ; and by three slender tendons from near the cardinal 

 border of the hyposternal ; it is inserted by a broad tendinous 

 sheet into the mesial border of the same plastral element, which 

 is the homologue of the abdominal hamiapophyses and spine 

 receiving the same insertion. 



The obliquus externus, fig. 151, 40, arises from the inner side 

 of the extremities of the last four costal plates, and adherent 



