. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. 290 SKELETON OF THE HORSE. bones are known as occipital bones (fig. 153, So, , Bo), of which there are several; these are perforated by a large round hole, the foramen magnum, out of which passes the portion of the brain, the medulla oblongata, connecting the former with the spinal column. Beneath this opening are the two swellings, the occipital condyles. The top of the cranium is composed of four fiat thin bones : the ones joining the occipitals are the parietd. Fia. 153.—Diagram of the Relations of the Prin
. A text-book of agricultural zoology. Zoology, Agricultural; Zoology, Economic. 290 SKELETON OF THE HORSE. bones are known as occipital bones (fig. 153, So, , Bo), of which there are several; these are perforated by a large round hole, the foramen magnum, out of which passes the portion of the brain, the medulla oblongata, connecting the former with the spinal column. Beneath this opening are the two swellings, the occipital condyles. The top of the cranium is composed of four fiat thin bones : the ones joining the occipitals are the parietd. Fia. 153.—Diagram of the Relations of the Principal Bones of THE Mammalian Skull. Me, Mesethmoid ; Ps, prespheuoid; £0, basioccipitel; £s, liasisphenoid ; Os, orbito- Hplienoid; Fr, frontal; , exoccipital; .SO, supraoccipital; Na, nasal; Twi, tur binals ; Per, periotic ; 1, position of exit of olfactory nerve ; 2, optic nerve ; 3, inolol oculi nerve; 4, trochlear nerve ; 5, 7, S, tliree divisions of 5th nerve; 6, abducens oculi; 9, facial; 10, auditory; 11, glosso-phai-j'ngeal; 12, pneumOL.'astric; 13, spinal •accessory ; 14, liypoglossal; Sq, squamosal; Ty, tympanic ; Vo, vomer; PMx, pre- maxilla; Mx, maxilla; PI, palatine; Pt, pterygoid; /k, malar; La, lachrymal; U, mandible ; , Meckel's cartilage ; iv, anterior hyoid arch ; v, posterior hyoid arch. (After Flower.) bones (P (fig. 152) and Pa (fig. 153)), and those in front of the parietals are the frontah {F and Fr) ; these extend behind the eye-regions. The sides of the skull are partlj^ shut in by the temporal hones with the zygomatic processes (Z and Sq). The sphenoid bones {As, Os, Ps, and Bs) shut in the side of the cranium partly, and lie between the occipitals, frontals, palatine (PI), vomer {Vo), pterygoid (Pi), ethmoid, and 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 w
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
