. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. ATLAS ; INFERIOR SDTIFACE. 1, Articular cavities for condyles of the occipital bone; 2, articulai facet; 3, vertebral or antero-internal fora- men ; 4, posterior, or cervical fora- men ; 5, transverse process or wing; quite at their base, and on each side of the spinal foramen, they show two large vertical facets which represent the posterior articular processes ; these facets are uneven, are confounded with the articular cavity of the upper face of the body, and correspond to the two analogous facets of the axi
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. ATLAS ; INFERIOR SDTIFACE. 1, Articular cavities for condyles of the occipital bone; 2, articulai facet; 3, vertebral or antero-internal fora- men ; 4, posterior, or cervical fora- men ; 5, transverse process or wing; quite at their base, and on each side of the spinal foramen, they show two large vertical facets which represent the posterior articular processes ; these facets are uneven, are confounded with the articular cavity of the upper face of the body, and correspond to the two analogous facets of the axis. Each trans- verse process is pierced at its base by two foramina, which traverse it from below upwards. The posterior represents the vertebral foramen of the other vertebrae ; while the anterior is continued to the external surface of the process by a wide, deep, but very short channel, running from with- out to within, and joins a third foramen, which enters the spinal canal. These last two openings, with the demi-canal which unites them, replace the anterior notch ; the posterior is altogether absent. Lastly, an inflected venous canal, the position of which varies, and it is also sometimes 6, tubercle representing the inferior absent, crosscs the laminae of the atlas, and opens, spinous process ; 7 superior arch, ^^ ^^q g^[^Q j^to ^J^g Spinal Canal, and OU the forming the roof of the spinal fora- , , ,i ,i , mi n men. Other, beneath the transverse process, ihe atlas contains much compact tissue, and is generally developed from six centres of ossification : two for the body, which at an early period becomes a solid piece, and two for the annular part; the other two are complementary centres, each of which forms one of the two posterior undulated facets and lip of the corresponding transverse process. Second.—This is named the axis, or dentata (Fig. 16). It is the longest of all the cervical vertebrae ; those which succeed it gradually diminish in length and in thickness.
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Keywords: ., bookauthorcha, bookcentury1900, bookdecade1900, booksubjecthorses
