Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 46 GENERAL PAKT. sheaths, which are prolonged over their processes and so over the nerve fibres. Very generally several ganglion cells are enclosed in a common sheath. Nerve fibres are either centrifugal, , they carry nervous impulses from the central organ to the peripheral organs (motor, secretory nerves); or they are centripe- tal, , they carry them from the periphery to the central organs (sensory nerves).
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 46 GENERAL PAKT. sheaths, which are prolonged over their processes and so over the nerve fibres. Very generally several ganglion cells are enclosed in a common sheath. Nerve fibres are either centrifugal, , they carry nervous impulses from the central organ to the peripheral organs (motor, secretory nerves); or they are centripe- tal, , they carry them from the periphery to the central organs (sensory nerves). They are prolongations of ganglion cells, and, like them, are fre-
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