. Diseases of the nervous system . Fia. 39.—From the Anterior Horn of the Gray Substance of the Spinal Cord. (After Kolliker.). Pig. 40.—The Anterior Roots andtheir Relations to the Mem-branes. (After Toldt.) Fig. 41.—Transverse Section through the Inter-vertebral, Disc, between the Third and FourthCervical, Vertebrae. (After Toldt.) 49 50 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM anterior columns, and pass to the lateral column at their boundary (, a, Fig. 38, Fig. 39, a). Thus they reach the anterior horns of the spinalcord, and prove to be nerve processes from some of the large anterior
. Diseases of the nervous system . Fia. 39.—From the Anterior Horn of the Gray Substance of the Spinal Cord. (After Kolliker.). Pig. 40.—The Anterior Roots andtheir Relations to the Mem-branes. (After Toldt.) Fig. 41.—Transverse Section through the Inter-vertebral, Disc, between the Third and FourthCervical, Vertebrae. (After Toldt.) 49 50 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM anterior columns, and pass to the lateral column at their boundary (, a, Fig. 38, Fig. 39, a). Thus they reach the anterior horns of the spinalcord, and prove to be nerve processes from some of the large anterior horncells situated there (Fig. 39), particularly from the anterior median group(Waldeyer). It must be remembered that in the anterior horns there aremany cells which have nothing in common with the anterior roots, and which,as Ramon maintains, belong to altogether different neurons. The arrangement of the first motor neuron of the spinal cord is thereforesimple and readily comprehended. It is composed of a number of large ante-rior horn cells with their dendrites, and of anterior roots which emerge fromthe lateral mo
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