236 



DORSAL MUSCLES OF THE TRUXK. 



Fig. 191. 



Fig. 191. VIEW OP THE 

 DEEP MUSCLES OP THE 



BACK, DESIGNED TO 



SHOW SOMEWHAT DIA- 

 GRAMMATICAL!^ THEIR 

 ATTACHMENTS TO THE 

 VERTEBRAL COLUMN AND 

 RIBS. | 



On the left side the seve- 

 ral parts of the erector spinse 

 are nearly in their natural 

 position, with the excep- 

 tion of the spinalis dorsi, 

 which is drawn out laterally 

 from the spines of the ver- 

 tebrae ; on the right side 

 the spinalis dorsi has been 

 entirely removed, the ilio- 

 costalis drawn to the outer 

 side so as to expose its 

 accessory muscle, and the 

 longissimus removed except- 

 ing small portions at its 

 insertions. Superiorly on 

 the left side, the trachelo- 

 mastoid and complexus 

 major are left neai'ly in 

 their natural positions ; 

 while, on the right side, the 

 trachelo-inastoid has been 

 entirely removed, and the 

 com plexus major, separated 

 from its occipital attach- 

 ment, has been spread out 

 to the side so as to stretch 

 its vertebral attachments. 



a, occipital protuberance ; 



b, mastoid process; c, bifid 

 spinous process of the axis 

 vertebra ; I, spinous pro- 

 cess of the first dorsal ver- 

 tebra and first rib ; VI, 

 sixth dorsal spine and trans- 

 verse process and sixth rib ; 

 XII, twelfth dorsal spine 

 and twelfth rib. On the left 

 side of the figure, 1, com- 

 plexus major muscle ; 2, 

 trachelo- mastoid ; 3, serra- 

 tus posticus superior, de- 

 tached from the vertebral 

 column and drawn upwards 

 from the ribs ; 4, 4, the 

 slips of attachment of the 

 serratus posticus inferior to 

 the four lower ribs; 5, three 

 blips of origin of the latis- 

 simus dorsi from the lower 

 ribs ; 5*, iliac origin of the 

 same muscle; +, common 

 origin of the longissimus 

 dorsi and ilio-costalis 

 from the ilium and sac- 

 rum, &c. ; 6, upper part of 

 the lon^issimus dorsi ; 0', 



