(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 3. Illustration of the lateral view of the skull, and ventral view of the
palato-maxillary arch, of Naja nigricollis. Muscle attachment sites
are shown as solid colors (lateral surface) or broken colors (medial surface)
for the following muscles: M. adductor mandibular externus superficialis
(yellow); M. levator pterygoideus (purple); M. protractor pterygoideus (red);
M. retractor pterygoideus (blue); M. pterygoideus (green). e, ectopterygoid;
m, maxilla; pa, palatine; pf, prefrontal; pt, pterygoid.