166 CRANIAL GROUP. 



1 . Cranial group. Occipito-frontalis. 



Dissection. The ocdpito-frontalis is to be dissected by making a 

 longitudinal incision along the vertex of the head, from the tubercle 

 on the occipital bone to the root of the nose ; and a second incision 

 along the forehead and around the side of the head, to join the two 

 extremities of the preceding. Dissect the integument and superficial 

 fascia carefully outwards, beginning at the anterior angle of the flap, 

 where the muscular fibres are thickest, and remove it altogether. 



Fig. 82.* 



* The muscles of the head and face. 1 . The frontal portion of the occipito- 

 frontalis. 2. Its occipital portion. 3. Its aponeurosis. 4. The orbicularis 

 palpebrarum, which conceals the corrugator supercilii and tensor tarsi. 5 

 The pyramidalis nasi. 6. The compressor nasi. 7- The orbicularis oris. 8. 

 The levator labii superioris alaeque nasi ; the adjoining fasciculus between 

 numbers 8 and 9 is the labial portion of the muscle. 9. The levator labii supe- 

 rioris proprius ; the lower part of the levator anguli oris is seen between the 

 muscles 10 and 11. 10. The zygomaticus minor. 11. The zygomaticus major. 

 12. The depressor labii inferioris. 13. The depressor anguli oris. 14. The 

 levator labii inferioris. 15. The superficial portion of the masseter. 16. Its 

 deep portion. 17. The attrahens aurem. 18. The buccinator. 19. The attol- 

 lens aurem. 20. The temporal fascia which covers in the temporal muscle. 

 21. The retrahens aurem. 22. The anterior belly of the digastricus muscle; 

 the tendon is seen passing through its aponeurotic pulley. 23. The stylo-hyoid 

 muscle pierced by the posterior belly of the digastricus. 24. The mylo-hyoi- 

 deus muscle. 25. The upper part of the sterno-mastoid. 26. The upper part 

 of the trapezius. The muscle between 25 and 26 is the splenius. 



