BY W. J. S McKAY. 339 



Insertion. The terete banils run to the scapula ; the bands 

 from the second and the tliird vertebnB are inserted on the inner 

 lialf of the vertebral border of the scapula, while the remaining 

 bands are inserted on the whole length of the anterior costa, and 

 that portion of the supraspinous fossa lying between the insertion 

 of the ventral part of the acroinio-trachelien and the true anterior 

 costa. 



Relations. At its origin the muscle is placed between the 

 scalenus and the dorsal portion of the levator scapulae. 



M. SERRATUS MAGNUS. 



Origin. This muscle arises by three digitations from the 

 first three I'ibs at a point about half way between the spine and 

 the sternum. (Fig. 7, S.2I.C.) 



Insertion. Tlie three bands run towards the scapula and, 

 coalescing, are inserted by a fine tendon on the inner edge, close 

 to the posterior extremity, of the vertebral border of the scapula. 



Relations. At its origin the mnscle is related to the digi- 

 tations of the external oblique, and the slip from the first rib is 

 also related to the scalenus and costo-coracoideus. At its insertion 

 it is related to the rhomboid, levator scapulse and teres major. 



Innervation. Echidna : levator scapulae, from iii. cervical- 

 nerve ; serratus from v. and vi. cervical nerves. rnithorhyachus : 

 levator scapulse and serratus, iii., iv., v., vi. cervical nerves. 



Westling — Echidna: ii., iii. and vi. cervical nerves. 



EcitlDNA. 



Westling gives the origin from the transverse processes of the 

 2nd-7th cervical vertebrae, and from the lst-5th ribs. Insertion 

 on to the median half of the ventral surface and vertebral border 

 of the scapula. 



Leche follows Westling. 



MiVART says of serratus magnus and levator anguli scapulae — 

 " These muscles together form one large and thick layer arising 

 from the first four ribs and from the transverse processes of all the 

 cervical vertebrae from the seventh to the axis inclusive." 



