PR/1CTICAL DIRECTIONS. 443 



(Fig. 69, /',/"), noting the separation off from it on the dorsal side 

 of the ?pinalis dorsi (Fig. 69, g); on the ventral side of the iliocostal 

 (Fig. 69, h). 



2. The extensor caudse lateralis (p. 137, and Fig. 70, _/"). 

 Uncover this by cutting the lumbodorsal fascia over the sacral region. 



3. The iliocostalis (p. 128, and P^ig. 69, h). Uncover this 

 completely; note its connection with the longissimus dorsi at the 

 caudal end. Dissect apart some of its muscle-bundles, to see origin 

 and insertion. 



4. The splenius (p. 131, and Fig. 73, b). Transect this by an 

 incision beginning at its lateral border about four centimeters from 

 the cranial end of the muscle and extending oblicjuely craniodorsad 

 to the craniomedial angle of the muscle. Be careful not to injure 

 the longissimus capitis (Fig. 73, g). 



5. The longissimus capitis (p. 131, and Fig. 73, g). Transect. 



6. The spinalis dorsi (p. 129, and Fig. 69,^). Separate some 

 of its muscle-fibre bundles and trace to origin and insertion. 



7. The biventer cervicis (p. 132, and Fig. 69, a). Raise its 

 lateral border, turning it toward the middle line, and transect it near 

 its caudal end. 



8. The complcxus (p. 133, and Fig. 69, b). Raise its medial 

 border, and transect it near its cranial end. 



9. The longus atlantis (p. 134, and Fig. ji,/). 



10. I'he multifidus spinse (p. 130, and Fig. 70, d). Remove a 

 part of the longissimus dorsi in the lumbar region, and trace the 

 course of the fibres of the multifidus spinas. (If desired the entire 

 longissimus may be removed and the multifidus spin^e completely 

 uncovered.) 



11. The extensor caudoe medialis (p. 136, and Fig. 70, e). 



12. The semispinalis cervicis (p. 133, and Fig. 71, c). Dissect 

 apart some of its fibre-bundles to see origin and insertion. 



13. The interspinales and intertransversarii (p. 131) may be seen 

 in the region from which the longissimus dorsi was removed, by 

 removing the bundles of the multifidus spin?e. 



14. The rectus capitis posterior major (p. 134, and Fig. 71, a). 

 Transect. 



15. The obliquus superior (p. 136, and Fig. 71, e). 



x6. The obliquus capitis inferior (p. 136, and Fig. 71, b). 



17. The rectus capitis posterior medius (p. 135). Transect. 



18. The rectus capitis posterior minor (p. 135). 



19. The levatores costarum (p. 150). Remove in a part of the 

 thoracic region a portion of the iliocostal and longissimus dorsi, so 

 as to expose the dorsal ends of the ribs. The levatores costarum 

 will be seen as but slightly separated bundles continuous with the 

 external intercostals. 



