. Elements of human physiology. Physiology. THE BRAIN 655 layer. Below this, in the motor cortex, is a layer of large pyramidal or Betz cells, while deepest of all is the 'poly- morphous ' layer, composed of many types of cells, ordinary pyramidal cells, pyramidal cells with the base and axon tm-ned towards the surface (cells of Martinotti), and * Golgi cells' with a freely branching axon which terminates in the adjacent grey matter. Among the nerve-fibres passing between grey and white matter, four types (Fig. 300) can be distinguished: a. Projection fibres, passing from the pyramidal cells t
. Elements of human physiology. Physiology. THE BRAIN 655 layer. Below this, in the motor cortex, is a layer of large pyramidal or Betz cells, while deepest of all is the 'poly- morphous ' layer, composed of many types of cells, ordinary pyramidal cells, pyramidal cells with the base and axon tm-ned towards the surface (cells of Martinotti), and * Golgi cells' with a freely branching axon which terminates in the adjacent grey matter. Among the nerve-fibres passing between grey and white matter, four types (Fig. 300) can be distinguished: a. Projection fibres, passing from the pyramidal cells to lower levels of the central nervous system. These include the various fibres, pyramidal and otherwise, that make up the internal capsule and the crusta. Fiu. Schematic section through cerebral hemispheres, to show chief classes of nerve tracts (after Eamon y Cajal). A, corpus cal- losum; B, anterior commissure ; C, pyramidal tract; a, cell giving off projection fibre ; b, cell giving oil' commissural fibre; f, cell with axon forming association fibres. h. Commissural fibres passmg across the corpus callosum and anterior commissure to the opposite hemisphere. c. Association fibres passing from one part of the cortex to another on the same side of the brain. d. Afierent or sensory fibres, starting in most cases from the region of the thalamus and passing up to termmate by branching in the superficial layer of the cortex. In a section through the cortex, stained by some method such as Weigert's, to display medullated nerve-fibres, in addition to the bundles of radial fibres. 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 Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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