. Quain's Elements of anatomy. formed, united by ligaments, constitutes the spinalor neural canal, which lodges the spinal cord. Texture.—The bodies of the vertebras are almost entirely composed of spongy substance,the principal lamella being vertical ; on the surface is a thin layer of compact canals, commencing at the larger foramina behind, traverse the cancellated arch and processes contain a much smaller proportion of spongy substance, being coveredwith compact tissue of considerable density in some places. GROUPS OF VERTEBRiE. The vertebrse are divided into fi
. Quain's Elements of anatomy. formed, united by ligaments, constitutes the spinalor neural canal, which lodges the spinal cord. Texture.—The bodies of the vertebras are almost entirely composed of spongy substance,the principal lamella being vertical ; on the surface is a thin layer of compact canals, commencing at the larger foramina behind, traverse the cancellated arch and processes contain a much smaller proportion of spongy substance, being coveredwith compact tissue of considerable density in some places. GROUPS OF VERTEBRiE. The vertebrse are divided into five groups, named from the regions which theyoccupy, cervical, dorsal, lumlar, sacral, and coccygeal. Cervical vertebree.—These are seven in number ; they are the smallest of the moveable vertebrae, and are spe-cially characterized by the pre-sence of foramina in the trans-verse processes. The first andsecond are so peculiar in form,as to require a separate descrip-tion. The following are thecommon characters of a cervical. INF. vertebra. POST. TUBERCLEGROOVE FOR NERVEANT. TUBERCLE INF. ARTirPROCESS IMF. VERTEBRAL NOTCH Fig. 2.—Fourth cervical vertebra : A, from aboveB, PROM THE RIGHT SIDE. (Drawn by 1). Gunn.) The hocly is small, and muchbroader from side to side thanfrom before backwards ; in depthnearly the same in front andbehind. Its upper surface is trans-versely concave from the upwardprojection of its lateral margins,and is sloped down in front. Theunder surface, on the contrary,is rounded off at the sides, whileits anterior margin forms a markedprojection downwards. The pedicles spring from the body about midway between the upper and lower borders, and are directed outwards and backwards ; the lamince are slender, long and flat. The superior and inferior notches are nearly equal in depth. The spinous process is short, only slightly depressed, and bifid. The iranverse iirocesses are short, and present at their extremities two tubercles,
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectanatomy
