Quain's elements of anatomy . 822 THE NERVOUS SYSTEM, first wide and shallow, and soon receiyes a lining of vascular connectivetissue or pia mater. The commissures are now also formed ; the anteriorgrey commissure first, then the posterior grey, and somewhat later theanterior white commissure. Fiff. Fig. 724.—Transveese section of half THE CARTILAGINOUS VERTEBRAL COLUMNAND THE SPINAL CORD IN THE CERVICALPART OF A HUMAN EJIBRYO OP FROM NINE TO TEN WEEKS. (Frcm Kolliker.) ^ c, central canal lined with epltlielimn ;a, anterior column ; jj, posterior column ;2), band of Goll ; g, ganglion of
Quain's elements of anatomy . 822 THE NERVOUS SYSTEM, first wide and shallow, and soon receiyes a lining of vascular connectivetissue or pia mater. The commissures are now also formed ; the anteriorgrey commissure first, then the posterior grey, and somewhat later theanterior white commissure. Fiff. Fig. 724.—Transveese section of half THE CARTILAGINOUS VERTEBRAL COLUMNAND THE SPINAL CORD IN THE CERVICALPART OF A HUMAN EJIBRYO OP FROM NINE TO TEN WEEKS. (Frcm Kolliker.) ^ c, central canal lined with epltlielimn ;a, anterior column ; jj, posterior column ;2), band of Goll ; g, ganglion of theposterior root ; jj r, posterior root; a r,anterior root passing over tlie ganglion;d m, dura-matral sheath, omitted near p r,to show the posterior roots; 6, body ofthe vertebra ; c h, chorda dorsalis; n a,neural arch of the vertebra. In the further increase of theanterior and lateral white columnsas they thicken, they become moreunited together on each side, sothat they can only he arbitrarilydistinguished; the fibres of theroots of the nerves are tracedthrough them into the grey matter;the cornua of grey matter become more and more developed, and thefissures between the white columns deepen, while the connective tissue Fig. 725. Fig. 725.—Transverse sec- tion OF HALF OF THESPINAL CORD OF
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
