. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . e external sur-face to the white matter,may be named: (1) The zonal or plexi-form layer. (2) The outer granule orsmall-celled layer. (3) The outer pyramidallayer. (4) The inner granulelayer. (5) The inner pyramidallayer. (6) The spindle or multi-form layer. The plexiform layer,though it contains cells, es-pecially the so-called hori-zontal cells, consists mostlyof fibres. According to Ca-jal,^some of these, the tan-gential fibres, arise fromthe horizo
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . e external sur-face to the white matter,may be named: (1) The zonal or plexi-form layer. (2) The outer granule orsmall-celled layer. (3) The outer pyramidallayer. (4) The inner granulelayer. (5) The inner pyramidallayer. (6) The spindle or multi-form layer. The plexiform layer,though it contains cells, es-pecially the so-called hori-zontal cells, consists mostlyof fibres. According to Ca-jal,^some of these, the tan-gential fibres, arise fromthe horizontal cells of thislayer, and may be regardedas association fibres, andothers are axons from cellslying in the deeper layers, ordendrites from the pyramidal cells. The plexiform layer is thereforea place in which numerous synaptic connections are formed be-tween the various cells of the cortex. But the plexiform layer isnot the only plexus of nerve-fibres in the cortex. Intricate networks Vergleichende LokalisaUonslehre der Grosskirnrinde in ihren Principien dar-gestellt auf Grund des Zellenbaus, pp. 14-42 (Leipzig, 1909). Op. cit., p. Fig. 109.—Different Types of Cells Found in theCortex. (Starr, Strong, and Learning.) CELI^LAYERS IN THE CORTEX 267 of fibres, medullated and unmedullated, exist in the various the cortex is stained for medullated fibres (Fig. 110), somelayers are seen to contain many such fibres, and some only a the deepest layers, near the white matter, the network of hori-zontal and oblique fibres is specially dense. Those layers whichshow but few medullated fibres are not, however, free from a net- |& is,
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