A treatise on the principles and practice of medicine . lumns of cord: D,D, branchesto anterior horns in cord; in second (lower) neurone, E, cells of anterior horns, E, cellsin pons; F, nerve trunks; G, motor end plates; H, muscles. axis-cylinder of the upper segment by contact (Ramon y Cajal) or byconcrescence (Held); it extends along its own axis-cylinder into theanterior nerve roots and nerve (F)f and ends in terminal ramifications(G, motor end plates) in a muscle, e. g., of the arm or leg, which is on theside opposite to the origin of the cortical motor centre. From the cells ofboth segmen
A treatise on the principles and practice of medicine . lumns of cord: D,D, branchesto anterior horns in cord; in second (lower) neurone, E, cells of anterior horns, E, cellsin pons; F, nerve trunks; G, motor end plates; H, muscles. axis-cylinder of the upper segment by contact (Ramon y Cajal) or byconcrescence (Held); it extends along its own axis-cylinder into theanterior nerve roots and nerve (F)f and ends in terminal ramifications(G, motor end plates) in a muscle, e. g., of the arm or leg, which is on theside opposite to the origin of the cortical motor centre. From the cells ofboth segments the motor impulse travels downward (cellulifugal con-duction). About 75 per cent, of the upper motor neurones cross asabove described, are called the crossed pyramidal tracts (, in Figs. GENERAL ANATOMICAL CONSIDERATIONS 821 61 and 62) and lie in the lateral columns of the cords; 25 per cent, of themotor fibers do not cross in the medulla, but pass down in the anteriorcolumns of the same side—the anterior or direct pyramidal tracts (,. GANGLION CELL OF CORTEX. BEGINNING OF 1ST NEURONE AXIS CYLINDEROR AXONE C. TERMINAL FILAMENTSEND OF FIRST NEURONE
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