The anatomy of the nervous system, from the standpoint of development and function . ined with ependymal I ill SPINAL (dkl) 8l epithelium and the lumen is often blocked with epithelial debris. The canal,which is narrowest in the thoracic region, expands within the lower pari of theeonus medullaris to form a fusiform dilatation, the ventriculus terminalis. Posterior median sulcus and septumCollaterals from fast it ulus cuneatus \ Posterior funiculus Dorsal root Substantia eelatinosa • Posterior column ]??( irvix Dorsolateral fasciculus (LissaueiPosterolateral mU us Lateral funiculus Posterior c
The anatomy of the nervous system, from the standpoint of development and function . ined with ependymal I ill SPINAL (dkl) 8l epithelium and the lumen is often blocked with epithelial debris. The canal,which is narrowest in the thoracic region, expands within the lower pari of theeonus medullaris to form a fusiform dilatation, the ventriculus terminalis. Posterior median sulcus and septumCollaterals from fast it ulus cuneatus \ Posterior funiculus Dorsal root Substantia eelatinosa • Posterior column ]??( irvix Dorsolateral fasciculus (LissaueiPosterolateral mU us Lateral funiculus Posterior commissure ----^J**** Anterior urav ----:?commissure llmm Anterior icliile •.. column f Ventral root fibers _Anterolateral side, Central canal \ A nterior median fissureAnterior funiculus Fig. 57.—Section through the fifth lumbar segment of the spinal cord of a child. Pal-Weigerl method. Dorsal roots of lumbar and sacral nerves,// Posterior funiculus Substantia gelatinosaDorsolateral fasciculus Posterior column , Lateral funiculus ii ;?:.???*. Anterior column Ventral roots of lumbar andsacral nerves Fig. 58.—Section of the third sacral segment of the human spinal cord and the lumbosacral nerveroots of the Cauda ecpiina. Pal-Weigert method. The White Substance.—The long myelinated fibers of the cord, arranged inparallel longitudinal bundles, constitute the white substance which forms a 82 THE NERVOUS SYSTEM thick mantle surrounding the gray columns. In each lateral half of the cord itis divided into the three great .strands or funiculi, which have been described While matter. Grey matter. —Enhire secrion. 100 • ao -^ . \ • 60 (l .—^ \ 40 20 -.\ \ I 11 III IY Y \1 YUYin 1 II III IY Y YJ YII YJ1I IX X XI XII 1 D III IVY I IlUJKVl Fig. 59.—Curves showing the variations in sectional area of the gray matter, the white matter, andthe entire cord in the various segments of the human spinal cord. (Donaldson and Davis.) on the surface of the cord.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
