. Fig. 27. Diagram of nervous paths followed by the nerve impulses causing tlie knee-jerk and its reenforcements. A, hammer placed to strike ligamentum patellae ; B, quadriceps muscle ; C, posterior spinal nerve root; D, motor cell in anterior horn of gray matter of lumbar cord; E, anterior spinal nerve root; F, sensory nerve from other leg; G, commisural cell; H, descending path from leg area in cerebral cortex; I, descending path from arm area in cerebral cortex; J, motor nerve to arm.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1