. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. THE SPINAL CORD.—GENERAL. 463 Fia. 327.—General view of spinal cord (Cliauveau). A, cervical bulb; B, lumbar bulb; C, Cauda equina. Fig. 828.—Segment of spinal cord at the cervical bulb, or brachial plexus, showing its upper face and the roots of the spinal nerves (Chauveau). A, superior roots; B, inferior roots; C, multiple ganglia of superior roots; D, single ganglion on an exceptional pair; E, £, upper roots passing through the envelopes. reception and genera
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. THE SPINAL CORD.—GENERAL. 463 Fia. 327.—General view of spinal cord (Cliauveau). A, cervical bulb; B, lumbar bulb; C, Cauda equina. Fig. 828.—Segment of spinal cord at the cervical bulb, or brachial plexus, showing its upper face and the roots of the spinal nerves (Chauveau). A, superior roots; B, inferior roots; C, multiple ganglia of superior roots; D, single ganglion on an exceptional pair; E, £, upper roots passing through the envelopes. reception and generation of impulses independent of the brain; or as a conductor of afferent and efferent impulses destined for the brain or originating in that organ. As a matter of fact, however, it is better to bear in mind that the cord and brain constitute one organ or chain of organs, which, as we have learned from our studies in development, are differentiations of one common track, originating from the epiblast. While the brain and the cord may act independently to a. Fig. 329.—Transverse section of spinal cord of child six months old, at middle of lum- bar region, showing especially the fibers of gray substance, 1 x 20. (After Ger- lach.) o, anterior columns; d, posterior columns; c, lateral columns; d, anterior roots; i", posterior roots; /. anterior \vhite commissure- g, central canal lined by epithelial cells; A, connective-tissue substance surrounding it; i, transverse fibers of gray commissure in front, and k, the same behind central canal; I, two veins cut across; m, anterior cornua; n, great lateral cell group of anterior corniia; o, lesser anterior cell group (column); p^ smallest median cell group; q, posterior cornua; n ascending fasciculi in posterior cornua; s, substantia 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
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