Human anatomy, including structure and development and practical considerations . sess one axone and several dendrites, varyin form (Fig. 841). Some, as those within the sym-pathetic ganglia, are approximately spherical and ofmoderate size, with short delicate dendrites ; manyare of large size and irregularly stellate form, thedendrites passing out in all directions, as seen in theconspicuous motor neurones within the gray matterof the spinal cord ; others possess a regular andcharacteristic form, as the Hask-shaped cells of Purkinjewithin the cerebellum, or the pyramidal cells of thecerebral
Human anatomy, including structure and development and practical considerations . sess one axone and several dendrites, varyin form (Fig. 841). Some, as those within the sym-pathetic ganglia, are approximately spherical and ofmoderate size, with short delicate dendrites ; manyare of large size and irregularly stellate form, thedendrites passing out in all directions, as seen in theconspicuous motor neurones within the gray matterof the spinal cord ; others possess a regular andcharacteristic form, as the Hask-shaped cells of Purkinjewithin the cerebellum, or the pyramidal cells of thecerebral cortex. Certain multipolar neurones withinthe cerebral cortex, and especially those constitutingthe chief components of the granule layer, of thecerebellum, are distinguished by the small size oftheir cell-bodies and the peculiar ramitications and claw-like telodendria of theirdendrites (Fig. 945j. Within the cerebellar cortex are likewise found examples of Bipolar neurones; a, from olfactorymucous membrane—dendrite is above;f>, from retina. ^Modifiedfiom CajaL) Fig. Multipolar nerve-cells of various forms; .1, from spinal cord ; B. from cerebral cortex; C, from cerebellar cortex(Purkinje cell) ; ii, axone; r, ini|)lantation cone. the multipolar neurones of Golgis type II, whose axones almost immediatelyundergo elaborate branching within the gray matter to which they are Nerve-Fibres.—From the foregoing considerations it is evident that thenerve-fibres are not independent elements, but that all are the processes of neurones—either the axones of those that are prolonged into fibres (type I), or the dendritesof those situated within the spinal and other sensory peripheral ganglia. Althoughneurones exist which are not continued as nerve-fibres, the latter are alwa^•s connected rill-: Ni:R\()i s rissuKS. lOOI Im(;. S42.
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