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Independently of the three conditions where excessive menstruation is connected with vaso-motor paralysis, a fourth may be found directly in the excitement of the ovarian plexus of nerves. This evolution of nerve-force which accompanies the maturation of the ovule, is the immediate cause of the afflux of blood to the utero-ovarian vessels.
Only, in this last case, the congestion results in the elaboration of a fluid secretion, the gastric juice; in the utero-ovarian plexus, where no secretion is required, the blood itself is discharged.
The utero-ovarian blood-vessels derive their nerves from the hypogastric plexus, which, formed by branches from both sympathetic ganglia and spinal cord, is the exclusive source of the innervation of the uterus and ovaries.
The cell growth in question is effected in the ovaries; the final stage of the process, the rupture of the containing cell or ovisac, and escape of the ovule, is attended by a concentration of nervous activity in the ganglionic masses sending nerves to those organs analogous to that which occurs in the solar plexus at periods of digestion; the fall of the ovule is itself analogous to the shedding of epithelial cells in the gastric follicles; the afflux of blood to the utero-ovarian veins, analogous to the periodical congestion of the gastro-splenic vascular apparatus.
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