60 



THE MUSCLES. 



12. M. lateralis narmm (Ecker), (Fig. 54 In). 



Zenker, m. inter maxillar is lateralis. Klein, m. nasalis inferior. 

 Duges, sus-rnaxillo-pre-nasal, n. 2. 



This small muscle occupies the space between the anterior portion 

 of the maxillary bone and the ascending process of the premaxillary 

 bone. It arises from the maxillary, and ascends obliquely forwards 

 to be inserted into the outer border of the ascending process of the 

 premaxillary bone. It is antagonistic to the foregoing. 



A third muscle is described by Duges as sus-maxillo-post-na&al, 

 n. 3 (nasalis externns, Klein) ; according to him it passes from the 

 proc. nasalis of the maxillary bone to the outer border of the nasal 

 opening, which it widens. According to Klein (I.e., p. 9). this 

 muscle in R. temporaria runs to the upper border of the maxillary bone 

 beneath the lower eyelid, and is long and narrow. I have, however, 

 never been able to find muscular fibre in this situation. 



III. MUSCLES OF THE LOWER, JAW. 



13. M. depressor maxil- 

 lae inferioris, Cams, Zenker 

 (Figs. 55, 56, 63 fl.m.). 



Cuvier, I.e., II, 141, diijas- 

 tricus. Duges. sus-occipito- 

 dorso-angulaire, 32. 



This is a strong, trian- 

 gular muscle, wide above, 

 pointed below. It is placed 

 between the head and the 

 shoulder-blade. It arises in 

 two portions; the greater, 

 from the fascia dorsalis 

 (fd ), covers the scapula, and 

 passes inwards and back- 

 wards over the muscles of 

 the back ; anteriorly it passes 

 over the m. temporalis and 

 is attached to the fronto- 

 parietal and squamosal, 

 being continued to the 

 fascia of the up^er eyelid. 

 The second part is smaller, 

 and arises by fleshy fibres 

 from the postero-superior 



Muscles of the back and shoulder. 

 M. cucullaris. 



,dm JH, depressor maxillae, arising from the fascia 

 / dorsalis. On the right side it is cut through 

 and reflected. 

 Fascia dorsalis. 



Same cut near the gpinous processes. 

 /M. infraspinutns. 

 M. levator angnli scapulae. 

 /M. latissimus dorsi. 

 M. retrahens .scapulae. 

 M. sternoeleidomastuideus. 



