. A manual of diseases of the nervous system. atthe ends of the vertebral spines are oppositethe middle of their own bodies only in thelumbar region; they correspond to the loweredge of their own bodies in the cervical andthe last two dorsal vertebrae, and to the upperpart of the body below in the rest of thedorsal region. Each cervical spine is neai-lyopposite the lower roots of the nerve below;the vertebra prorainens is opposite the firstdorsal roots, and from the 3rd to the 10thdorsal the spines correspond to the second rootbelow; the 11th spine corresponds to the 1st and 2nd lumbar nerves,
. A manual of diseases of the nervous system. atthe ends of the vertebral spines are oppositethe middle of their own bodies only in thelumbar region; they correspond to the loweredge of their own bodies in the cervical andthe last two dorsal vertebrae, and to the upperpart of the body below in the rest of thedorsal region. Each cervical spine is neai-lyopposite the lower roots of the nerve below;the vertebra prorainens is opposite the firstdorsal roots, and from the 3rd to the 10thdorsal the spines correspond to the second rootbelow; the 11th spine corresponds to the 1st and 2nd lumbar nerves, the 12th to the 3rd, ff^WI- Co. 4th and 5th; the 1st lumbar to the 1st, 2ndand 3rd sacral nerves, while the top of the cordis opposite the upper part of the 2nd lumbar. or column of Burdach, the part of which next the cornuis called the posterior root-zone, because many fibres of the 164 SPINAL CORD. posterior root pass througli it. The rest of the white suhstance isdivided, in the middle line in front, by the anterior median fissure, ,oois. Fig. 64.—Diagram of a section of the spinal cord in the cervical region. A. c,anterior commissure; P. c, posterior commissure; I. g. s., intermediate grey sub-stance; P. cor., posterior cornu; c. c. p., caput cornu posterioris; L., laterallimiting layer; A. T., antero-lateral ascending tract, which extends along theperiphery of the cord. down which the pia mater and blood-vessels pass, and at the bottomof which is the anterior or white commissure. Between the anteriormedian fissure and the posterior cornu the white substance is con-tinuous and undivided, extending round the front and side of thecord. It is artificially divided into an anterior and a lateral column,the line of division being the outermost of the anterior nerve-roots,which pass through the front of the cord; but there is no correspond-ing distinction of structure, and hence it is often termed the antero-lateral column. The white substance varies in amount in dif
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnervoussystem, bookye
