. Cunningham's Text-book of anatomy. Anatomy. THE SPINAL MEDULLA. 523 Fasciculus gracilis Posterior funiculus ^zsmcsts-— Fasciculus cuneatus Posterior nerve-root Formatic*reticularis Lateral funiculus Central canal Accessory root Origin of accessory Posterior ___L__ column of |M| gray lllllll matter A'-'-' ^ 'i y __i_-i lift , ''-I': t Anterior nerve-root Internal Structure of the Spinal Medulla. The spinal medulla is composed of a central core of gray matter thickly coated on the outside by white matter. At only one spot does the gray matter come close to the surface, viz., at the bottom of t
. Cunningham's Text-book of anatomy. Anatomy. THE SPINAL MEDULLA. 523 Fasciculus gracilis Posterior funiculus ^zsmcsts-— Fasciculus cuneatus Posterior nerve-root Formatic*reticularis Lateral funiculus Central canal Accessory root Origin of accessory Posterior ___L__ column of |M| gray lllllll matter A'-'-' ^ 'i y __i_-i lift , ''-I': t Anterior nerve-root Internal Structure of the Spinal Medulla. The spinal medulla is composed of a central core of gray matter thickly coated on the outside by white matter. At only one spot does the gray matter come close to the surface, viz., at the bottom of the sulcus lateralis posterior. Gray Matter of the Spinal Medulla.—The gray matter in the interior of the spinal medulla has the form of a fluted column, but it is customary to describe it as it appears in transverse sections. It then presents the appearance of the capital letter H. In each lateral half of the spinal medulla there is a semilunar or crescentic mass, shaped somewhat like a comma, the concavity of which is directed laterally and the convexity medially. The two crescents of opposite sides are con- nected across the median plane by a transverse band, which receives the name of the commissura grisea (gray commissure). The posterior median septum cuts through the spinal medulla until it reaches the gray commissure. The bottom of the anterior median fissure, however, is separated from it by an intervening strip of white matter, which is termed the commissura anterior alba, or anterior white commissure. In the gray commissure may be seen the central canal of the spinal medulla (canalis centralis), which tunnels the entire length of the spinal medulla and is just visible to the naked eye as a minute speck. The por- tion of the gray commis- sure which lies behind the central canal is called the commissura posterior; whilst the portion in front receives the name of the commissura anterior grisea. Each crescentic mass of gray matter presents cer- tain well - defined part
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