. A text-book of agricultural zoology. Zoology, Economic. 290 SKELETON OF THE HOKSE. 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 flat thin bones : the ones joining the occipitals are the parietal. Fig. 153.—Diagram or the Relations of the Principal Bones of THE Mam
. A text-book of agricultural zoology. Zoology, Economic. 290 SKELETON OF THE HOKSE. 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 flat thin bones : the ones joining the occipitals are the parietal. Fig. 153.—Diagram or the Relations of the Principal Bones of THE Mammalian Skull. Me, Mesethmoid; Ps, prespheuoid; Bo, basioccipital; Bs, basisphenoid; Os, orbito- sphenoid; Fr, frontal; , exoceipltal; SO, supraocclpital; Na, nasal; Turh, tur- binals; Per, periotic; 1, position of exit of olfactory nerve; 2, optic nerve; 3, motoi: oculi nerve; 4, trochlear nerve ; 5, 7, 8, three divisions of 5th nerve; 6, abducens oouli; 9, facial; 10, auditory; 11, glosso-pharyngeal; 12, pneumogastric; 13, spinal accessory; 14, hypoglossal; Sq, squamosal; Ty, tympanic; Vo, vomer; , pre- maxilla; Mx, maxilla; PI, palatine; Pt, pterygoid; Ju, malar; La, lachrymal; M, 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 frontals (F and Fr) ; these extend behind the eye-regions. The sides of the skull are partly shut in by the tempoml 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 (Pt), 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 Theobald, Frederick Vincent, 1868-1930.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
