42 STUDIES IN COMPARATIVE ANATOMY. 



Bhoniboideus mmo?\— Under this name may be distinguished 

 a small slip tolerably distinct from the pieceding, which passes 

 from the Kgamentum nuchae opposite the seventh cervical ver- 

 tebra to the posterior angle of the scapula. 



C. and L.—{Bkomhoidei) 276-7 (c^) ; 283, figs. 1, 2 (c^) ; 287-8 



Serratus ^posticus arises from the ligamentum nuchse and the 

 vertebral aponeurosis between the third and tenth dorsal ver- 

 tebrae. It is inserted into the anterior margins of the ribs from 

 the ninth to the fourteenth inclusive, and also to a strong fascia 

 with much elastic tissue which underlies the serrati. The pos- 

 terior fasciculus of the muscle is separable from the rest. 



C. and L.— 282, upper figure (10) ; 287-8 (10). 



Levator anguli seapuloe is directed obliquely across the low^er 

 part of the side of the neck. Its most forward attachment is to 

 the front of the transverse process of the atlas by means of a 

 thin, flat, tendinous slip. This portion of the muscle crosses 

 superficially the insertion of transverscdis colli. The lower por- 

 tion, which is separated by an interval from the rest, arises by 

 similar slips from the posterior tubercles of the transverse pro- 

 cesses of the five lower cervical vertebrae. This part of the 

 origin is overlaid by transversdlis colli. In the dorsal region the 

 muscle takes origin from the articular processes and angles of 

 the ribs between the first and fifth dorsal vertebrse. Longissimus 

 dorsi separates these two origins. The muscle passes down- 

 wards, and in part backwards, to its insertion into the anterior 

 border of the scapula. 



C. and L.— 274-5 (rf) ;' 276-7 {d, d^) ; 283, fig. 1 {d, should be 

 cZi) ; 287-8 {d, d^). 



8plenius. — This muscle consists of two superimposed layers. 

 The superficial layer, which is thinner and narrower than the 

 other, has a tendinous origin from the ligamentum nuchffi in the 

 anterior dorsal region. The tendon narrows as it passes forward, 

 and reaches the level of the third cervical vertebra. Muscular 

 fibres are given off from it on both sides, but the internal fibres 

 much preponderate, especially in the dorsal and posterior cer- 

 vical region. Towards the occiput the fibres radiate equally on 

 both sides from the fore end of the tendon. The muscle has an 

 extensive insertion, first, to a median ligamentous raphe con- 



