Organic and functional nervous diseases; a text-book of neurology . Large pluripolar ganglion cell of the ventral paramedian field of the abdominal cord of primitive fibril is seen on its way to a ganglion cell becoming thinner, owing to the emission of theside fibrils. A very complicated intracellular reticulum of neuro-fibrils is to be made out in the forma-tion of which the primitive fibrils of all the processes take part, kk, nucleolus; k, nucleus, a and /3are processes containing one primitive fibril in each, which arriving in the cell body split up intoseveral bifurcating ne
Organic and functional nervous diseases; a text-book of neurology . Large pluripolar ganglion cell of the ventral paramedian field of the abdominal cord of primitive fibril is seen on its way to a ganglion cell becoming thinner, owing to the emission of theside fibrils. A very complicated intracellular reticulum of neuro-fibrils is to be made out in the forma-tion of which the primitive fibrils of all the processes take part, kk, nucleolus; k, nucleus, a and /3are processes containing one primitive fibril in each, which arriving in the cell body split up intoseveral bifurcating neuro-fibrils. The primitive fibril in a can be followed for a very long distance,being thicker at a distance from the cell. The coarse longitudinal processes y and & contain a largenumber of primitive fibrils which, as far as they can be followed, do not unite to one fibril. (After , Mitth. aus der zool. St. zu Neapel, 1897, Bd. xii., Ht. 4, Taf. xxvii., Fig. 7.) Fig. Cells of the anterior corpora quadrigemina of the cat, to show neuro-fibrils. A, axone ; B, plexusof neuro-fibrils made up of fibrils entering the cell from the branches ; C, perinucleur plexus of fibrilsin a cell which has been divided longitudinally; D, fibrils running from the plexus into the branches.(Ramon y Cajal, Bibliog. Anat, 1904, p. 264.) THE CEBEBEO-SPINAL NEBVOUS SYSTEM. 25 which pass into the cell body, and through it into other dendrites orinto the axorie.^ These filaments are called neuro-fibrils. They werefirst demonstrated by Apathy in worms and have been more fully des-cribed in the hmnau neurone by Ramon y Cajal. (See Fig. 2.) Itis supposed that the dendrites collect and transmit nervous impulses tothe cell body ; and as they are niunerous and long it is evident thatimpulses from many sources may reach any one cell body. The axone or axis-cylinder process of the neurone is a single, long Fig. 4.
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