. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE HEAD. 91 Fig. 4. Ethmoid hone.—In Man, the external fa^e of the lateral masses—formed by a very thin lamina, termed the os planum or lamina pap2/r«e«—belongs to the internal wall of the orbit. 5. Sphenoid bone.—TLiis is distinguished, in Man, into a body and four wings-two large and twfi small. Tlie inferior surface of the body oflfers nothing remarkable, except the presence of a conical prolongation named the beak (rostrum) of the .sphenoid. The external face of the greater wings forms part of the temporal fow
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE HEAD. 91 Fig. 4. Ethmoid hone.—In Man, the external fa^e of the lateral masses—formed by a very thin lamina, termed the os planum or lamina pap2/r«e«—belongs to the internal wall of the orbit. 5. Sphenoid bone.—TLiis is distinguished, in Man, into a body and four wings-two large and twfi small. Tlie inferior surface of the body oflfers nothing remarkable, except the presence of a conical prolongation named the beak (rostrum) of the .sphenoid. The external face of the greater wings forms part of the temporal fowsa, as also the external wall of the orbit. At the union of the with the body, are detached two bifid pterygoid ^ses; their internal branch represents the pterygoid bones of animals. There is no sub- sphenoidal canal. Tlie two lesser wings are very thin and triangular, and visible only on the superior surface of the bone ; they constitute the processes of Ingrassias. On the internal face of the bone are found: (1) a deep pituitary fossa, limited by four cUnoid pro- cesses; (2) an optic fossa, shallow, showing very short optic canals transformed into foramina ; (3) the sphenoidal fissure, which replaces the great super- spheiioidal canal in the Horse; (4) the great foramen rotundum; (5) the internal face of the wings, much excavated; (6) the foramen ovale, which transmits the inferior maxillary nerve; (7) the small foramen rotundum that lodges the spheno-spinous artery. 6. Temporal hone.—In the squamous portion of the temporal bone of Man, the zygomatic process only rests on the malar bone, as in Ruminants. The glenoid cavity is concave in every sense, ami divided into two parts by an opening named t\\e fi'<sura Glaneri; the anterior portion only is articular —the posterior, lying against the external auditory canal, does not belong to the articulation ; it corresponds to the supra-con- dyloid eminence of the Horse. The tuberous portion is consolid
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