PRACTICAL DIRECTIONS. 443 
(Fig. 69, 7’, 7"), noting the separation off from it on the dorsal side 
of the spinalis dorsi (Fig. 69, g); on the ventral side of the iliocostal 
(Fig. 69, 4). 
2. The extensor caude lateralis (p. 137, and Fig. 70, /). 
Uncover this by cutting the lumbodorsal fascia over the sacral region. 
3. The iliocostalis (p. 128, and Fig. 69, #). 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, 4). Transect this by an 
incision beginning at its lateral border about four centimeters from 
the cranial end of the muscle and extending obliquely 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, g). 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 complexus (p. 133, and Fig. 69, 4). Raise its medial 
border, and transect it near its cranial end. 
9. The longus atlantis (p. 134, and Fig. 71, /). 
10. The multifidus spine (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 spine. (If desired the entire 
longissimus may be removed and the multifidus spine completely 
uncovered. ) 
11. The extensor caudz 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 spinz. 
14. The rectus capitis posterior major (p. 134, and Fig. 71, a). 
Transect. 
15. The obliquus superior (p. 136, and Fig. 71, @). 
16. The obliquus capitis inferior (p. 136, and Fig. 71, 4). 
17. The rectus capitis posterior medius (p. 135). Transect. 
18. The rectus capitis posterior minor (p. 135). 
19. The levatores costarum (p. 150). Remove ina 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. 
