ANATOMY OF REGIONS. 
153 
metrical. It presents three regions : fronto-parietal , nasal and superior 
labialj we will also describe in it the olfactory apparatus. 
SECTION 1. FRONTO-PARIETAL REGION. 
Having for base the anterior face of the frontal bone, and the por¬ 
tions of the parietal, situated between the two crests, this region has 
the form of a lozenge; the superior angle of which runs up to the origin 
of the mane (the fore-lock), the inferior is resting upon a line uniting 
the internal angles of both eyes, and limiting the nasal region; on the 
sides the fronto-parietal region is bounded by the temporal and orbito- 
palpebral regions. 
The forehead has more or less extent; its width and height are 
characteristic beauties of pure breed, they give to the head a square 
form, the finest and the best, as indicating a larger development of the 
brain. In animals with square forehead, the fronto-parietal surface is 
perfectly flat; but, it is often found convex. This is a defectuous 
character, when persisting in adult animals; its results of a peculiar 
condition of the frontal fissures. In young subjects, the forehead, on 
the' contrary, always presents a convex surface, so much more developed 
as the animal is younger. 
This is due to the small development of the facial part of the 
frontal bone, and of the bones of the face, compared to those which 
form the cranial walls. The fissures properly speaking, do not exist in 
the foetus, and begin to show themselves in the young animal, only after 
a certain age. 
The skin of the frontal region is little movable ; it is furnished 
with short hairs, which ordinarily form a radiated spot in the middle of 
the forehead. 
Between that tegument and the bone, there is only a fibrous layer; 
somewhat thick, representing the epicranial aponeurorosis of man, it is 
strongly adherent to the periosteum, and attached to the skin by a very 
thin fascia, and thus is easily isolated. 
The skeleton of that region is formed at its superior parts, by the 
portion of the parietal bones included between the parietal crests, and 
by the whole surface of the flat portions of the anterior face of the 
frontal. In the thickness of this bone, we find the two frontal sinuses, 
cavities hollowed between the plates of the bone, entirely in front of the 
* cranium, and separated from each other, by a bony lamella, almost 
median and always imperforated Each frontal communicates with the 
corresponding maxillary sinus, by a wide opening at its inferior wall. 
