106 THE MUSCLES. 
small bundle (Fig. 63, #’) from near the dorsal end of the 
frontal process of the maxillary bone, in common with the 
next. The two slips thus formed unite craniad and are inserted 
partly into the integument on the outer side of the wing of the 
nose, partly into the skin of the upper lip, lateroventrad of the 
nose, and partly into the pad on which the whiskers are located, 
in connection with the next. 
(2) The angular head (caput angulare), or levator labii 
superioris proprius (Fig. 63, 7; Fig. 64, 7) is much larger 
than the last. It takes origin from a small tubercle at the 
cranial border of the orbit, close to the origin of the orbicularis 
oculi. The fibres diverge from their origin to their insertion 
among the whiskers and in the fibrous pad on which the 
whiskers rest. 
Action. —Erects the whiskers and raises the upper lip. 
M. caninus or levator anguli oris (Fig. 64, 7’). 
Origin in a depression on the lateral surface of the maxil- 
lary bone, just craniad of the last premolar tooth. The fibres 
pass craniad, diverging, toward the whiskers, and have their 
insertion into the pad of tissue on which the whiskers rest. 
Action.—Retracts the whiskers and raises the upper lip. 
M. buccinator.—A thin muscle against the mucous mem- 
brane of the upper lip, partly united with the orbicularis oris 
and lying beneath M. caninus. 
Origin on the outer surface of the superior maxillary bone 
in the depression between the infraorbital foramen and the first 
premolar tooth. The fibres pass ventrad, diverging, and 
mingle with those of the deep part of the orbicularis oris. 
Relations.—Outer surface with the caninus and with the 
orbicularis oris. Inner surface with the mucous membrane of 
the upper lip. 
Action.—Raises the upper lip. 
M. myrtiformis (probably corresponds to a part of the 
human M. nasalis) (Fig.'64, 4).—A thin sheet of muscle-fibres 
lying craniad of the levator labii superioris alaque nasi and 
passing from the whiskers to the nose and upper lip. It is dis- 
tinguishable from the aleeque nasi by the direction of the 
fibres. 
