Part 97

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.

VIII. MUSCLES OF THE HIND LIMBS (p. 186).

Remove the skin and superficial fascia from the lateral surface of the thigh. Examine the fascia lata (p. 186, and Fig. 68, z). Dissect:

1. The biceps femoris (p. 194, and Fig. 68, t). Work under its cranial and caudal borders. Find the tenuissimus (Fig. 90, g) passing obliquely beneath it and reaching its caudal border in its distal half. Transect the biceps without injuring the tenuissimus, and reflect its halves.

2. The tenuissimus (p. 195, and Fig. 90, g). Transect.

3. The caudofemoralis (p. 195, and Fig. 68, s). Transect.

4. The gluteus maximus (p. 187). Transect.

5. The sartorius (p. 197, and Fig. 68, q; Fig. 91, a). Transect.

6. The tensor fasciæ latæ (p. 187, and Fig. 68, r). Cut the fascia lata along the distal end of the muscle-fibres and reflect the muscle.

7. The gluteus medius (p. 188, and Fig. 90, b). Work under it carefully, separating it from underlying muscles; cut it close to its tendon of insertion, and reflect it.

8. The pyriformis (p. 188, and Fig. 163, 7, p. 401). Cut and reflect it.

9. The gemellus superior (p. 189, and Fig. 163, 6). This and the next muscle will sometimes be found to be completely united. Transect.

10. The gluteus minimus (p. 189, and Fig. 163, 5). Transect.

11. The obturator internus (p. 192, and Fig. 90, e). Cut it at the dorsal border of the ischium in order to reflect it. The whole origin cannot be seen at this stage.

12. The gemellus inferior (p. 190).

13. The gracilis (p. 198, and Fig. 91, b). Transect.

14. The semitendinosus (p. 196, and Figs. 90 and 91, j; Fig. 92, i). Transect.

15. The semimembranosus (p. 196, and Figs. 90 and 91, i; Fig. 92, h, h′). Transect.

16. The adductor femoris (p. 198, and Figs. 90 and 91, h; Fig. 92, g). Transect.

17. The quadratus femoris (p. 191, and Fig. 90, f). Transect.

18. The obturator externus (p. 191).

19. The adductor longus (p. 199, and Fig. 92, f). This and the following will sometimes be found to be almost completely united. Transect.

20. The pectineus (p. 200, and Fig. 92, e). Transect.

21. The iliopsoas (p. 193, and Fig. 91, c; Fig. 92, d). Only its distal part, near the insertion, can be seen at present.

22. The capsularis (p. 190). Transect.

23. The quadriceps femoris (p. 201). Isolate the rectus femoris (Fig. 92, b) as far as its junction with the vastus lateralis; cut it at this point and reflect its proximal portion. Turn aside the distal end and find beneath it the transverse aponeurosis between the vastus medialis and the vastus lateralis, and covering the vastus intermedius. The vastus lateralis (Fig. 90, d) may be cut near the middle and dissected up from its origin in both directions; the vastus intermedius is thus exposed. The vastus medialis (Fig. 92, c) and the vastus intermedius need not be cut.