. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 156 SPINAL MARROW. The pia mater is the immediate covering. This is a cellular membrane consisting almost entirely of vessels. It terminates in a round cord-hke process, reaching from the end of the spinal mar- row to the bottom of the canal, being concealed in the roots of the nerves which constitute the caucla equina. SPINAL MARROW. The spinal marrow is the medullary column included in the spinal canal of the verte
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 156 SPINAL MARROW. The pia mater is the immediate covering. This is a cellular membrane consisting almost entirely of vessels. It terminates in a round cord-hke process, reaching from the end of the spinal mar- row to the bottom of the canal, being concealed in the roots of the nerves which constitute the caucla equina. SPINAL MARROW. The spinal marrow is the medullary column included in the spinal canal of the vertebrse. ^'^•^^^- ^ig-138. It is cylindrical, and reaching from the atlas, terminates in a point at the first or second lumbar ver- tebra. It is flattened an- teriorly and posteriorly, and has an enlargement in the neck and loins. It is divided longitudinally into symmetrical halves, by an anterior and a pos- terior fissure. The ante- rior^ fissure is broad and shallow; the posterior^ is deep and narrow. Each half is divided unequally by a lateral fissure; the anterior column being the larger.* A transverse section of the spinal marrow exhibits the arrangement of its me- dullary and gray matter. The medullary matter is external, and the gray, in this section, resembles two crescents united by a com- missure. The posterior horns of the crescent extend to the surface in the lateral fis- sure, in which originates the posterior root of the nerves. From the sides of the spinal marrow proceed 30 pairs of nerves, each ori-. 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 Neill, John, 1819-1880; Smith, Francis Gurney, 1818-1878. Philadelphia, Lea and Blanchard
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