. The anatomy of the domestic animals. Veterinary anatomy. BONES OF THE CRANIUM 135 They constitute the upper part of the posterior wall, bend sharply forward along the lateral wall, and enter into the formation of the temporal fossa. The line of inflection is marked by the prominent parietal crest, which is continuous with the temporal crest below and the frontal crest anteriorly. The parietals are excavated to form part of the frontal sinuses in the adult animal. Parietal miiwHce boite Processus ^_^ cornus Zygomatic arch Temporal fossa Supraorbital foramen Supraorbital groove. Nasal bone Pal
. The anatomy of the domestic animals. Veterinary anatomy. BONES OF THE CRANIUM 135 They constitute the upper part of the posterior wall, bend sharply forward along the lateral wall, and enter into the formation of the temporal fossa. The line of inflection is marked by the prominent parietal crest, which is continuous with the temporal crest below and the frontal crest anteriorly. The parietals are excavated to form part of the frontal sinuses in the adult animal. Parietal miiwHce boite Processus ^_^ cornus Zygomatic arch Temporal fossa Supraorbital foramen Supraorbital groove. Nasal bone Palatine fissure Nasal process of premaxilla Palatine process of premaxiUa Body of premaxilla Fig. 133.—Skull of Jersey Cow; Dorsal View. The condition in the young subject is as follows: The two parietals are united with each other and also with the interparietal and supraoccipital. The resulting mass is somewhat horseshoe- shaped. Its occipital part (Planum occipitale) forms the gi-eater part of the posterior wall of the cranium and bears about its center the tuberosity for the attachment of the ligamentum nuchas. From either side of this a line curves outward and divides the surface into an upper smooth area and a lower area which is rough for muscular attachment. The upper border joins the frontal bone and concurs in the formation of the frontal eminence. The temporal parts (Plana temporaUa) are much smaller and are concave externally; they join the frontal above and the squamous temporal below. A median occipital crest extends ventrally from the external occipital protuberance. The frontal bones are very extensive, forming about one-half of the entire. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sisson, Septimus, 1865-1924. Philadelphia, London, W. B. Saunders Company
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