Spinal Cord

or MARROW, (spinal.) [From L. spinal is, belonging to a spine.] (Anat.) That part of the nervous system which is enclosed(Fig. 608) in the spinal column (see VERTEBRE) of vertebrate animals. Atits B upper end it is connected with that part of the D human brain called the medulla oblong at a, T and is continued to the first or second lumbar vertebra, giving off in its course thirty one pairs of nerves, each having two roots. It has been proved that sensation depends upon the posterior root, and the E-power of voluntary motion upon the anterior root. The S. C. is comG posed of white and gray nervous matter, the white being on the outer side. D Spindle (spin'dl.) [A.S.] The pin used for twisting the thread in a handloom, and H on which the twisted thread is afterwards wound. Seo WEAVING.i (Camb.) A measure of 18 hanks or 15,120 yards of cotton yarn; or of 24 he ers of 14,400 yards Fig. 608. of linen yarn.NERVOUS-CEP HALO SPINAL CENTRES. (Geom.) A solid A, brain; B, cerebellum; C, cerebral pro tu-generated by berance(pons cerebelli); DD, medulla spi-the revolution na lis (showing laterally the roots of the of the arc of a spinal nerves); EE, spinous proce es of curvilinear line thevertebræ; F, 7th cervical vertebra; G. about its 12th dorsal vertebra; H, 5th lumbar vertebra; I, sacrum. chord; the one generated about its axis is known as a cano id. [s. 846]