ANATOMY OF THE HORSE. 
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dilatator naris anterior. — Naso-transversalis. 
Situation. —In front of and between the nostrils. 
Figure .—Transverse parallelogram. 
Attachments.— In the middle, to the bony peak formed by the 
apices of the ossa nasi; on the side, to the anterior surface ot the 
alse or broad cartilages of the nose. 
Relations. —Externally, with the skin and the united tendon 
belonging to the nasales longi labii superioris; internally, to the 
broad and also to the narrow cartilages of the nose, and to the 
triangular space between them; superiorly, with the ossa nasi; 
inferiorly, with the glandular substance of the lip. 
Direction. —Transverse. 
Structure. —Fleshy, except at its attachment to the os nasi. 
NASALIS BREVIS LABII SUPERIORIS. 
Super-max illo-nasalis parvus. 
Situation. —Behind the external nares. 
Figure. —Narrow, thin, forming two sides of a triangle. 
Attachments. —Inferiorly, to the superior and anterior maxil¬ 
lary bones, and to the suture uniting them; superiorly, to the os 
nasi; in the middle to the horn or cornet of the nose and the skin 
of the false nostrils : it forms, in fact, a fleshy investment to the 
angular bony boundary of the false nostrils. 
Relations. —Externally, with the levator labii superioris alseque 
nasi, the tendon of the nasalis longus labii superioris, and the 
skin ; internally, the membrane of the nose. 
Direction. —Transverse, inclining forwards. 
Structure. —Fleshy. 
DEPRESSOR LABII SUPERIORIS. 
Situation.—- Side of the upper jaw. 
Figure. —Broad, thin, irregular. 
Attachments. —Inferior attachment, to the alveoli of the lateral 
and middle incisores, extending thence along the side of the jaw 
as far as the tusk; superiorly, it is confounded with the glan¬ 
dular substance of the upper lip, and is also connected with the 
inferior nasal cartilages. 
Relations. —Anteriorly, the labial gland, and, at the side, with 
the nerves descending from the pes anserinus ; posteriorly, the 
front of the jaw ; superiorly, the cartilages of the nose; inferiorly, 
the incisor teeth. 
