156 
A. LIAUTARD. 
erice is found. This is formed by the fleshy portion of the super-maxillo 
labialis muscle,* * * § much developed in the middle third of the region; 
it afterwards diminishes and terminates by a linear sailly formed by its 
tendons, which can be followed to the point of the nose. 
In animals whose skin is fine, and when by artificial excitement the 
circulation is accelerated,, the terminal branches of the external maxil¬ 
lary vein are plainly seen under it. Under the skin there is a thin 
aponeurotic layer. The most superficial muscular layer is formed by 
the supernaso-labialis,f rising from the nasal bones by a thin and wide 
aponeurosis, united posteriorly to the lachrymal muscles, and running 
towards the commissure of the lips, where it terminates by two branches 
through which passes the pyramidal J muscle of the nose. A second 
layer comprehends the super-maxillodabialis,§ situated upon the sides of 
the region; its tendon, which continues forwards the fleshy part unite 
with that of the opposite side, widening to form an aponeurosis which 
enter into the formation of the superior lip, which by its contraction it 
raises and turns upwards. 
Blood Vessels and Nerves. —The arteries are the two terminal 
blanches of the glosso-facial; one ascending towards the nasal angle of 
the eye, the other descending towards the false nostrils; they are inter¬ 
crossed with their satellite veins, which, being a little more superficial, 
pass to the surface of the super-nasolabialis muscle, while the arteries 
run underneath. 
A very large sensitif nervous fasciculus, the superior maxillary nerve 
(superior branch of the trigemini), runs outside the maxillary foramen 
and spreading widely, follows the external face of the maxillary bone’ 
mixed up to the inferior arterial ramifications. It is very easy to recog¬ 
nize the spot where the maxillary foramen is located; it can be felt under 
the skin, at about to 2 inches forward of the apex of the maxillary 
spine. ^ Some branches of the facial nerve, whose position is not abso¬ 
lutely hxed, and intermixed with branches of the superior maxillary 
brings on power of motion to the muscles. 
Deferences.. * lie chagrin of the Ox is straight, and shorter than 
that of the horse; it spreads slightly inferiorly towards the muzzle. The 
nasal bones are terminated by two points, and are quite movable; they 
support a cartilaginous frame, mingling with that of the turbinated 
bones. 
* Nasalis longus labii superioris of Percivall. ~ 
t Ebii superioris alaque nasi of Percivall. 
I Dilatator naris lateralis. 
§ Nosalis longus labii superioris. 
