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Nerve fibers. Labels: a, nerve-fiber, showing complete interruption of the white substance; b, another nerve fiber with nucleus. In both these nerve fibers the white substance is stained black with osmic acid, and the axon is seen running as an uninterrupted strand through the center of the fiber. c, ordinary nerve fiber unstained; d, e, smaller nerve fiber; f, varicose nerve fiber; g, non-medullated nerve fibers.

Nerve Fibers

Nerve fibers. Labels: a, nerve-fiber, showing complete interruption of the white substance; b, another…

Diagram showing relation of neurons composing the spinal nerve roots with adjacent nervous structures. Labels: S.E., sensory epithelium connected by a sensory neuron with spinal cord; S.M., striated muscle receiving the axon from a motor-cell in the ventral horn of the gray matter in the cord; Sp. F., spinal fibers, medullated, sensory, and the motor, passing to the sympathetic ganglion where they connect with sympathetic neurons; S.F., S.F., non-medullated fibers from the sympathetic neurons passing to the viscera, the axons going to the plain muscle (P.M.), the dendrites to the sensory endings (S.E.).

Spinal Nerve Roots

Diagram showing relation of neurons composing the spinal nerve roots with adjacent nervous structures.…