Nervous Diseases Secondary to Diseases of the Genital Organs.
In earlier chapters of this work we have frequently referred to the reflex influence exercised upon the nervous system in general, alike by the normal functions and the pathological states of the female genital organs. We must now briefly explain the more intimate connection between nervous diseases and diseases of the genital organs, the causal dependence of local nervous disturbances and of general neuroses upon diseases of the reproductive organs.
The origination of a local nervous disease by a primary disease of the genital organs is dependent upon a simple mechanical process, which is explained by Windscheid in the following terms: “In this connection, the two principal mechanical factors are pressure and traction. Pressure may affect individual nerves or an entire nerve plexus, and may be exercised by a tumour, an exudation or a misplaced organ (Hegar); further causes of pressure are furnished by inflammatory nodules, by connective tissue hyperplasias, and, according to Freund, by contractile processes in the organs themselves and in the ligaments. Traction on the nerves results from displacements, as from prolapse of the uterus or the ovaries, and, according to Hegar, from traction on the pedicle of small tumours. A combination of pressure and traction occurs especially in affections of the abdominal attachments of the uterus, also where there is scarring of the neck of the uterus and of the vaginal fornices. Great importance, also, in relation to the production of local nervous disorders, must be attributed to the laying bare of nerve-terminals by catarrhal and other inflammatory processes. Abnormal mobility of the genital organs as a partial manifestation of enteroptosis must also be mentioned as a cause of mechanical stimulation of the nerves. Finally, in this connection, must be considered the paresis of the abdominal walls that follows frequent and severe confinements.”
The symptoms of the local nervous disorders to which these mechanical stimuli may give rise, are very various, but may, according to Hegar, be comprised under the general designation of lumbar enlargement symptoms (Lendenmarksymptome), inasmuch as the local stimulation of the intrapelvic nerves, affects the nerve-centres of the lumbar enlargement of the spinal cord. Among the symptoms, severe pains are prominent, either continuous or intermittent, within the pelvis and in the sacral region, accompanied by a sense of weight and pressure in the abdomen, or by dragging pain in the region of the hips, in the gluteal region, in the outer and back parts of the thighs, in the inner surface of the leg, in the calf, in the dorsum of the foot, the sole of the foot, and the heel; or by coccydynia (pain over the coccyx and the lower extremity of the sacrum), or hyperæsthesia and anæsthesia of the external genitals in the region of the vaginal orifice, or, finally, by disorder of the processes of micturition and defæcation. In some of these cases, the weakness of the lower extremities is so severe that a paralytic condition is simulated. Actual paralysis may however occur, in consequence of the extension of peritoneal inflammation to the nerve-plexuses of the pelvis, leading to the occurrence of neuritis.
The development of a general neurosis in consequence of disease of the genital organs, either as a complication dependent upon the nervous stimulation excited by the primary disease, or as a reflex consequence of this disease, implies, as Windscheid strongly maintains, the existence prior to the occurrence of the disease of the genital organs of diminished power of resistance on the part of the nervous system. This neuropathic constitution may be the result of inheritance, and, according to Engelhardt, was so in 40 per cent. of his cases of women suffering from nervous disease secondary to the disease of the genital organs; or it may be acquired. Given this weakness of the nervous system, a local disturbance of the genital organs may act as the ultimate exciting cause of the onset of the neurosis in one of two different ways (Windscheid). “1. The stimulus which the nerves of the affected genital organ (or those of some adjacent area, affected by direct extension) have received, proceeds upward from segment to segment of the spinal cord, and ultimately passes to the highest centres. 2. Or, on the other hand, the local nerves are not directly involved in the morbid process in the genital organs, but this latter acts as a source of reflex disturbance, a disturbance which must also pass through nervous channels. To this latter class of cases belong the instances, comparatively so frequent, in which, for example, a trifling retroflexion of the uterus must be regarded as the exciting cause of the neurosis.” The commonest neurosis of those that may be excited by local disease of the genital organs is undoubtedly hysteria, next in frequency come chorea and epileptic seizures.
Schauta draws attention to the important fact that hereditarily predisposed, neurasthenic individuals bear very badly repeated gynecological examinations and long-continued local treatment, inasmuch as, in such persons, a notable increase in the severity of the nervous affection may result, and even the outbreak of actual mental disorder; and he further points out that in hereditarily predisposed individuals, psychoses not infrequently occur in consequence of the performance of gynecological operations.
The processes of pregnancy make a deep impression on woman’s entire nervous system, and more especially on her mental functions. This is especially noticeable in the case of primiparæ. The fact is easily understood, for a woman is filled with expectation and anxiety concerning the unknown event, the complete revolution in her organization, the powerful impressions on her physical ego, the formation of a new being within her womb. How many joyful hopes, how many distressing fears, are connected with that which is about to take place, with the act of creation within her bosom; what changeful glimpses into the future, on the one hand the gladness, on the other the terror, of motherhood; often, also, the anxious doubts as to the probable sex of the newcomer. Consider, too, the stormy sensations experienced by a woman who, unmarried, has become pregnant contrary to her desires and expectations, especially one in a poverty-stricken condition—consider the agonizing thoughts in such a case regarding the consequences of giving birth to a child. It is only to be expected that in pregnant women in general there will almost always be increased irritability of the nervous system combined with a tendency to the rapid variation of emotional states. Neumann found, in almost all the pregnant women he examined in respect to the point, that there was an increase of the knee-jerks, as a manifestation of the general increase of nervous irritability. Nor does this change depend upon mental influences exclusively; there are other factors, such as the reflex processes aroused by the enlargement of the uterus, and also the changes in the composition of the blood which occur during pregnancy, and cannot fail to have an influence on the nutrition of the brain. Finally, also, the deposit of carbonate of lime on the inner surfaces of the cranial bones (the parietal and frontal bones) which occurs during pregnancy, may be regarded as having some casual connection with the changes in the nervous system; and, again many authors assume that the cerebral circulation is influenced by the formation of the placental circulation.
The pathological consequences of pregnancy, as far as they affect the nervous system, take the form of neuralgia and of peripheral neuritis of various nerves, of chorea, of disturbances of the sense organs, and of actual psychoses.
Peripheral neuritis in pregnant women affects chiefly the lower extremities, but has been observed in the arms also; it is characterized by muscular wasting with reaction of degeneration, by trophic disturbances, and by disorders of sensation. A cure may ensue even during the pregnancy, but in other cases the illness persists until after parturition and on into the puerperium. To the same cause Windscheid assigns the paræsthesias of pregnancy, burning, prickling, and numb sensations of the finger-tips, less commonly of the toe-tips; these sensations are continuous, not paroxysmal, and cause very great suffering.
Pregnancy favors the occurrence of chorea, a circumstance explicable by the increased irritability of certain nerve centres characteristic of the pregnant woman. The chorea of pregnancy occurs for the most part in primiparæ, it is commoner in young than in older pregnant women, and appears especially in the early months of pregnancy. In the majority of cases the disease undergoes spontaneous cure before the end of the pregnancy, but cases with a fatal termination have been observed.