. Compendium of histology. Histology. NERVE TISSUE. 201 ture of the cells (Fig. 177). From the interior of its rounded, or pear and kidney-shaped body passes a straight axis-cylin- der process (c), which subse- quently acquires a medullary sheath. From the surface of the cell arises, singly or doubly, with close spiral convolutions, an- other filament, which surrounds the straight axis cylinder with wider turns ; it may also run alongside of the latter (d), and subsequently leave it (/), pass- ing further in a straight form. Whether these spiral fibres are elastic or—which we regard as more pr
. Compendium of histology. Histology. NERVE TISSUE. 201 ture of the cells (Fig. 177). From the interior of its rounded, or pear and kidney-shaped body passes a straight axis-cylin- der process (c), which subse- quently acquires a medullary sheath. From the surface of the cell arises, singly or doubly, with close spiral convolutions, an- other filament, which surrounds the straight axis cylinder with wider turns ; it may also run alongside of the latter (d), and subsequently leave it (/), pass- ing further in a straight form. Whether these spiral fibres are elastic or—which we regard as more probable—are actually of a nervous nature, is still unde- cided. Subsequent German in- vestigations have, unfortunately, not determined this. Finally, the fine, fibrillated formations, such as are pre- sented by the axis cylinder (p. 196), have also been most re- cently observed, continuing into the interior of the cell body, and more especially in the cortical portion of the latter. The finest fibrillae which stream in from the protoplasma, as well as the axis-cylinder process, run sometimes divergently, some- times crossing each Fig. 177.—Ganglion cell from the sym- pathetic of the hyla or green tree-frog ; a, cell body ; b, sheath; c, straight nerve fibre : and d, spiral fibre ; continuation of the former, e; and of the latter, 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 perfectly resemble the original Frey, Heinrich, 1822-1890; Cutter, George R. (George Rogers), b. 1840, tr. New York, G. P. Putnams sons
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