. L'anatomie de l'animaux domestiques . Anatomie vétérinaire. L'ethmoïde os crânien et 55 cavités nasales. Sa marge s'associe à l'orbital ailes du sphenoid latéralement, le corps du sphenoid ventralement et la plaque crânienne de l'os frontaux dorsalement. Sa surface cérébrale est divisé en deux parties par une crête médiane, la crista galli, qui peut être considérée comme l'une projection de l'perpen- dicular la plaque. Chaque moitié forme une cavité ovale profonde, l'ethmoidal fossa, qui héberge le bulbe olfactif. La plaque est perforé par de nombreux foramina petits pour le passage de l'appareil olfactif

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. The anatomy of the domestic animals . Veterinary anatomy. THE ETHMOID BONE 55 cranial and nasal cavities. Its margin joins the orbital wings of the sphenoid laterally, the body of the sphenoid ventrally, and the cranial plate of the frontal bones dorsally. Its cerebral surface is divided into two parts by a median ridge, the crista galli, which may be regarded as the intracranial projection of the perpen- dicular plate. Each half forms a deep oval cavity, the ethmoidal fossa, which lodges the olfactory bulb. The plate is perforated by numerous small foramina for the passage of the olfactory nerve filaments, and on either side is the much larger ethmoidal foramen. The nasal surface is convex, and has the lateral masses attached to it. Each lateral mass or labyrinth (Labyrinthus ethmoidalis) is conical in shape and its base is attached to the cribriform plate. It projects forward into the posterior Supraorbital process Frontal bone. Vomer Fig. 32.—Cross-section of Cranium of Horse. The Section Passes Through the Middle of the Orbits and IS Viewed from In Front. 1, Lateral mass of ethmoid bone; 2, perpendicular plate of same; 3, common nasal meatus: 4. splienopalatine sinus; 5, perpendicular part of palatine bone; 6, zygomatic process of temporal bone; 7, zygomatic arch; 8, orbital part of frontal bone. part of the nasal cavity. The medial surface is separated by a narrow space from the perpendicular plate. The lateral surface is convex and faces chiefly into the frontal and maxillary sinuses, but is attached behind to the inner wall of the orbital cavity; it is covered by a very thin layer of bone, the lamina lateralis. The mass consists of a large number of delicate, scroll-like plates of bone, termed ethmo-turbinates.'^ These are attached to the lamina lateralis, and are separated by narrow intervals termed ethmoidal meatuses, which communicate with the nasal cavity. In the fresh state the ethmo-turbinates are covered with mucous membrane. The lateral mass is a

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