DISSECTING MANUAL. 



tenor surface of the Erector spinse, being attached to the iliac 

 crest and angle of the last rib. The lumbar fascia is a narrow 

 band extending from the last rib to the iliac crest, between the 

 muscles of the back and abdominal wall. It is formed, at the 

 outer borders of the Quadratus lumborum and Erector spinse, 

 by the fusion of three f ascial strata, as follows : The posterior 

 layer is the vertebral aponeurosis; the middle layer extends 

 outward from the tips of the transverse processes, between 

 the Erector spinse and Quadratus lumborum; the anterior 

 layer begins at the junction of the transverse processes and 

 bodies of the lumbar vertebrse and runs outward in front of 

 the Quadratus lumborum. [391] 



Erector Spin*. Origin; iliac crest and posterior sacro-iliac 

 ligament by fleshy fibres ; iliac crest, back of sacrum, and spines 

 of upper sacral and all lumbar vertebrse, by tendinous fibres 

 continuous with preceding. Course; it ascends and divides 

 into two columns, viz. : Ilio-costalis (the outer column and de- 

 rived from the fleshy origin). Insertion; lower six ribs, by six 

 slips. Longissimus dorsi (the inner and larger column). In- 

 sertion; nearly all the ribs, by an outer series of slips; trans- 

 verse processes of thoracic, and accessory processes of upper 

 lumbar vertebrse, by an inner series of slips. These columns 

 are prolonged in the back and neck. [393] 



Spinalis Dorsi. Origin ; lower two thoracic and upper two 

 lumbar spines; tendon of Longissimus dorsi. Insertion; upper 

 (four to eight) thoracic spines. [395] 



Multifidus Spinae. Origin; sacrum; sacro-iliac ligament; 

 lumbar mammillary processes; thoracic transverse processes; 

 and lower four cervical articular processes. Course ; upward 

 upon the laminse. Insertion; vertebral spines, except that of 

 atlas. [395] 



Inter spinales. These are slips connecting together the 

 spinous processes. [398] 



Intertransversales. These are slips connecting the trans- 

 verse processes. [398] 



[104] 



