. The anatomy of the domestic animals. Veterinary anatomy. 56 THE SKELETON OF THE HORSE perpendicular plate and are termed endoturbinates. Tlusc liiniiuish in size from above down- ward; the largest is attached to the nasal Imne, ami is linirc uMially calleii the dorsal or nasal turbinate; the second is much smaller, and is very riuniiionly Icniied the great ethmoid ceU. The cavity rnrlnsnl by this communicates laterally with the maxillary sinus, but not directly with the iia-il .a\iiy. Between the endoturbinates are twenty-one small ectoturbinates, and all are liesri with sicondary and tertia
. The anatomy of the domestic animals. Veterinary anatomy. 56 THE SKELETON OF THE HORSE perpendicular plate and are termed endoturbinates. Tlusc liiniiuish in size from above down- ward; the largest is attached to the nasal Imne, ami is linirc uMially calleii the dorsal or nasal turbinate; the second is much smaller, and is very riuniiionly Icniied the great ethmoid ceU. The cavity rnrlnsnl by this communicates laterally with the maxillary sinus, but not directly with the iia-il .a\iiy. Between the endoturbinates are twenty-one small ectoturbinates, and all are liesri with sicondary and tertiary coiled lamella^. The perpendicular plate (Lamina perpcmlicularis) is niodian, ami forms the posterior part of the sejitum nasi. Its lateral surfaces are nearly phmc, but are marked below by some grooves and ridges; ihey are covered by the nasal mucous membrane. The anterior border is irregular and is continuous with the septal cartilage. The posterior border jfrojects into the cranial cavity as a ridge, the Fronhll I'dslcndr I'lid Siii)r(un-liitiil --*"]"" iij jroiUal sinus 1 (sau-n off) Friiiilii! hoiic (tcmpwal pari) Or\)ttal winij of sphenoid. — Foranun nrbilidc Foninu II rotnndum A tor roiiol Body of sphenoid Pterygoid iiroeess Fig 33.—Cross-1 ofCran Horse. The Section is Cut Just in Front ( AND Is Viewed from Behind. na! plate of frontal Ijone; 2, crista galli; 3, cribriform plate: 4, ethmoidal forai sphenoid bone: G, optic foramina. HE Tempor.\l Condyle 5, ethmoidal spine of crista galli. The dorsal border joins the frontal bones at their line of junction. The ventral border is receiveil into the groove of the vomer. Development.—The ethmoid develops in cartilage from five centers, two for each lateral mass, and one for the perpendicular plate; from the latter ossification extends into the cribriform plate. At birth the perpendicular and cribriform plates are cartilaginous. By the time ossification is complete the ethmoid has united with surrountli
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
