944 THE OSTEOLOGY AXD MYOLOGY OF THE DEATH ADDER, 

 M. INTER-TRAXSVERSARII. 



M. inter-transversarii, Hoffmann (lower part) ; Die untere Reihe 

 der Gelenkfortsdtzen, D'Alton. 



Belonging to the longissimus series is a small muscle which 

 runs between the processes of the anterior zygapophysis. Some of 

 the fibres as they pass backwards spread out over the fascia 

 covering the levatores costai'um. 



These muscles correspond to the lower pair of intertransverse 

 muscles described by D'Alton and Hoffmann; their superior inter- 

 transverse muscles we consider to be really part of the rotatores 

 dorsi group. They are separated from the latter muscles by the 

 aponeurosis of the longissimus tendons at their origin, and by the 

 internal divisions of the nerve trunks, while they are separated from 

 the levatores costarum beneath by the external divisions of the 

 posterior portion of the spinal nerves. 



Latero-dorsal group. (Humphry). 



M. SACRO-LUMBALIS. 



M. retractor costce biceps, der zweihauchige RucTctvartszieher der 

 Rip-pen, D'Alton ; Stratum secundum et tertium, Hiibner ; M. 

 ojnstothenar, Meckel ; sacro-lumhalis, Owen, R. Jones. 



The sacro-lurabalis is a muscle composed of two columns, an 

 internal and an external. 



The muscular bundles of the internal column arise from the 

 aponeurosis formed by the external tendons of the longissimus 

 muscle ; they also have an origin from the tendons of insertion of 

 the accessorius. Each bundle is somewhat flattened and runs 

 upwards and forwards to form a column of muscles, whose external 

 surface splits into a number of leaves which constitute the external 

 column. The elements of this external column are inserted by 

 means of tendons, which run downwards and forwards to the ribs 

 at the point where the levatores costarum arise, the tendons of the 

 two being closely connected. 



