Part 15

_Pflüger’s_ teaching has been opposed by _Sigismund_, who, whilst admitting the periodicity of ovulation and menstruation, yet regards the two processes, in the uterus the formation of the menstrual decidua, in the ovary the rupture of the graafian follicle, as independent of one another, even though they occur simultaneously. Should fertilization occur, the ovum implants itself in the prepared soil; should fertilization fail to occur, the menstrual hæmorrhage ensues. Thus, the occurrence of menstruation indicates that fertilization of the ovum has failed to occur. On this theory, then, the ovum that is fertilized belongs to the first period missed, whereas _Pflüger_ assumes that when pregnancy occurs, it is always the ovum belonging to the time of the previous menstruation—the last actual menstrual discharge—that is fertilized.

_Löwenhardt_, in his work on the _Diagnosis and Duration of Pregnancy_, advances the same views as _Sigismund_. The fertilized ovum, in his opinion also, is that of the first period missed; and since at the time at which he believes fertilization to occur the ovum is certainly still in the ovary, fertilization, on this theory, must always take place in the ovary itself, and the fertilized ovum cannot begin its intra-uterine life till a month has elapsed after fertilization. _Reichert_, _Kundrat_, _Engelmann_, and _Williams_, basing their views on anatomical data, are of opinion that ovulation recurs periodically, and that the extrusion of the ovum occurs not before but after the commencement of menstruation.

According to _Hensen_, the observed facts support the view that the follicles burst as a rule toward the end of menstruation; anticipation or postponement of the opening of the follicle (conception before or after menstruation) would, however, appear not to be impossible.

_Leopold_, who assumes that menstruation may occur without ovulation and ovulation without menstruation, maintains on anatomical grounds that the rupture of the graafian follicle occurs chiefly during menstruation, under the influence of the swelling due to menstrual congestion. Menstruation with ovulation he believes to be a common occurrence, menstruation without ovulation, an unusual occurrence. Further, it is certain that, at the time when the periodic bleeding is due, ovulation may occur, even though the menstrual discharge fails to make its appearance (ovulation without menstruation).

_Chazan_ and _Gläveke_ also adhere to the generally accepted view that ovulation is a periodic process, usually but not necessarily synchronous with menstruation.

_Strassmann_ bases on clinical facts and on experiments the following view of the connection between ovulation and menstruation. The principal processes in the organism of the sexually mature woman run their course in a periodic rhythm resembling an undulatory movement, the acme of which occurs in the antemenstrual period with the aim of preparing for the development of an infantile organism. Whilst an ovum is maturing in the ovary, in the uterus, in dependence upon this maturation, the antemenstrual mucous membrane, fitted for the reception and nutrition of the fertilized ovum, is also undergoing development. At the acme of the undulatory movement, the graafian follicle ruptures and the ovum is liberated, to undergo fertilization in the infundibulum of the Fallopian tube. If fertilization fails to occur, or if for any reason the graafian follicle fails to rupture, then, in consequence of and at the time of the highest intra-ovarian tension, at the time, when the rupture of the follicle usually occurs, the extrusion of blood from the capillaries of the uterine mucous membrane begins. The intermediation between the ovary and the uterus is probably effected by means of the sympathetic ganglion in the ovary discovered by _Elizabeth Winterhalter_, and effected in this manner, that the stimulus proceeding from the ripening follicle passes along the nerve-fibrils surrounding the follicle to the processes of the nerve cells of this sympathetic ganglion, accumulating in these cells till a certain degree of intensity has been reached, and then, by means of other processes and of the vasomotor nerves, influencing the vessels of the uterus.

_Gebhard_ likewise believes menstruation to be dependent on the ovarian function, and thinks that it is probably brought about in a reflex manner by the gradual growth of the ovarian follicles. It appears that most commonly at the time of menstruation a graafian follicle ripe to bursting is to be found in the ovary, but to this rule there are many exceptions. We cannot exclude the possibility, that the ovum from a follicle that burst after the commencement of the menstrual flow may be fertilized; but more commonly the ovum that is fertilized is that of the first period missed. The sudden decline in vital energy that occurs just before menstruation is explained by _Gebhard_ as a kind of atavism, dependent on the fact that many of the lower animals, butterflies, for instance, succumb as soon as they have fulfilled their duty of reproducing the species.

A number of modern investigators, however, deny that any relation, temporal or causal, exists between ovulation and menstruation, and affirm that the latter process is quite independent of the former.

Thus, _Christopher Martin_ maintains that a special menstrual centre exists in the lumbar portion of the spinal cord, the impulses from which proceed to the uterus by way of the splanchnic plexus, the ovarian plexus, or perhaps by both. Similar views are held by _Lawson Tait_, _Collins_, and _Johnstone_, who severally maintain that the ovaries are no more concerned in the production of menstruation than any other organ of the body—the liver, for instance. They direct attention to the periodicity that occurs in the functional activity of various other organs, in respiratory and cardiac activity, for instance, both of which undergo rhythmical changes as a result of nervous influences. The cessation of menstruation after oöphorectomy they attribute, not to the cessation of ovulation, but to the division of the nerves which run across the broad ligaments of the uterus and upon which menstruation depends. Heat and rut in animals have a different significance from menstruation. The latter process is induced by civilization and by the adoption of the upright posture.

But, taking all this into consideration, we must hold fast to the fundamental principles, that ovulation occurs at that period of life, and only at that period, during which menstruation proceeds regularly; that ovulation begins when externally and in the whole development of the girl the signs of sexual maturity manifest themselves; and that ovulation ceases at the climacteric, when menstruation also ceases. We must regard as rare exceptions to this rule cases in which ovulation begins before the menarche and persists after the menopause.

A physiological interruption of menstruation occurs during pregnancy and lactation; it seems improbable, however, that during this interval ovulation also is in abeyance. It is established by anatomical investigations that ovulation and menstruation commonly occur in association; but that menstruation sometimes, though rarely, occurs in the absence of ovulation; and, finally, that intermenstrual ovulation is also a rare occurrence. In the majority of cases, either just before or just after the commencement of the menstrual flow, rupture of a graafian follicle occurs. After complete oöphorectomy, menstruation ceases; it is only when functionally active portions of ovarian tissue have been left behind, that menstruation continues to occur. In the absence of the ovaries, the menstrual function is in abeyance; hence, for the performance of that function, the presence of ripening ovarian follicles and of other follicles capable of ripening later, is an indispensable requisite.

A certain analogy between heat and rut in animals and menstruation in women may, according to the investigations of _Bischoff_, _Hegar_, _Strassmann_, and others, certainly be maintained. Heat or rut is a process occurring in mammals, dependent on the reproductive glands, characterized by an increase in sexual and general excitability, with congestion of the pudendum and the vagina, swelling of the sebaceous glands of the external genitals, and increased secretion; from the vulval cleft there flows a peculiar, strong-smelling mucus, often tinted red from admixture with blood; there is frequent micturition, the uterine glands are swollen, the Fallopian tubes are also swollen, and are soft and erected. A well-developed menstrual bleeding, analogous to that which occurs in the human species, occurs, among the lower animals, only in apes. Maturation of ova precedes the period of heat, and rupture of the graafian follicle occurs during that period.

Heat or rut occurs in animals at certain seasons of the year, which may, according to the species and the mode of life of the animal concerned, be in spring, summer, autumn, or winter. The season of heat or rut has further several periods of heat, each lasting several days, and among domesticated animals, mares, cows, and bitches, succeeding one another at intervals of three or four weeks; in wild animals, rut occurs once only in the year. In animals, sexual intercourse takes place during the time of the menstrual discharge, and during this time also the capacity for conception is increased; in the absence of heat, the genital organs are in a more quiescent condition. In this connection, the experiments on animals made by _Strassmann_, with a view to determining the influence upon the uterus of rise of pressure in the ovary, are of great interest; these experiments showed that a rise of intra-ovarian pressure, produced by the injection of fluid into the parenchyma of the ovary, led to changes in the endometrium and the external genital organs corresponding to those occurring in an animal on heat.

In the human species, however, in contradistinction to what occurs in the lower animals, there is a certain disinclination, on the part of the male at any rate, to sexual intercourse during menstruation. The human female moreover, notwithstanding the periodicity of her sexual life, is at all times capable of conception; this capability is not confined to any particular part of the intermenstrual period, for conception may occur at any time during that period, and has even been known to result from intercourse during menstruation. This peculiar characteristic of the human reproductive capacity has been regarded as compensatory, furnished by nature in her continual endeavour for the perpetuation of the species, to counteract the restricting influences imposed by civilization on the normal process of reproduction.

Credible observations even exist, indicating that among many primitive peoples, in whom at the time of puberty no social laws hinder the limitless exercise of the reproductive functions, this capacity on the part of woman to conceive at any time has no existence, and that the reproductive capacity of such human beings is, like that of the lower animals, confined to a certain season of the year. Thus, _G. Schlesinger_ reports of the Ainus of the island of Yezo, “A friend of mine in Sapporo believes himself to have observed that the Ainus have a certain definite rutting period, and that in them, as in many of the lower animals, the process of reproducing the species occurs only at a certain season of the year.” An identical statement is current concerning the Indians of Western America.

The mucous membrane of the uterus undergoes during menstruation important changes, and a question much disputed is, whether in the course of menstruation the whole of the uterine mucous membrane is removed, or a part only, whether it is shed in its entire thickness, or is at least deprived of its epithelium. According to the observations made by _Leopold_ on dead bodies, the mucous membrane of the uterus becomes swollen shortly before the commencement of the menstrual discharge, until, partly in consequence of cellular proliferation, partly in consequence of œdematous infiltration, and partly in consequence of enlargement of the lymph-spaces, it attains a thickness of 6 to 7 millimetres (¼ of an inch). The superficial capillaries are notably enlarged, and an effusion of blood-elements continues for several days, without the occurrence of any fatty degeneration in the tissues. The epithelium and the most superficial cell-layers of the mucous membrane are, however, undermined and shed. No complete destruction of the mucous membrane occurs, however, and fatty degeneration forms no part of the menstrual process as such.

_Möricke_, who examined portions of the uterine mucous membrane removed with the curette during menstruation from living women, found the superficial layers of the mucous membrane to be intact, and he regards the shedding of the epithelium described by other authorities as cadaveric phenomenon. _Sinéty_, who also found the uterine mucous membrane intact during menstruation, adheres to the same view.

_Von Kahlden_ concludes, as a result of investigations made post mortem, that during menstruation the greater part of the mucous membrane, not the superficial epithelium only, but the stroma itself down to its deepest layers, is shed. According to _von Tassenbroek_ and _Mendes le Leon_, however, the most superficial layers only are shed during menstruation.

According to _Westphalen_, whose investigations were made, partly on masses removed by the curette, and partly on freshly extirpated uteri, a sanguineo-serous infiltration of the mucous membrane begins about ten days before menstruation. Great vascular dilatation occurs only just before menstruation. The uterine glands undergo enlargement, and during and immediately after the flow, numerous shed epithelium cells occupy the lumen of the glands. For the rest, however, in the interior of the uterus shortly after menstruation, we find an almost continuous epithelial covering. Some days after menstruation, the proper regeneration of the mucous membrane occurs.

_Mandl_, who examined totally extirpated uteri, asserts that during menstruation the epithelial covering of the mucous membrane is never completely lost, but that just as little does it remain completely intact. The regeneration of the lost areas of epithelium proceeds even during menstruation.

The researches of _Kundrat_ and _Engelmann_ on uteri obtained post mortem led these authors to describe as follows the anatomical changes that occur in the uterine mucous membrane at the time of the catamenial hæmorrhage. In the premenstrual epoch a round-cell infiltration occurs in the interglandular tissue, the lumina of the uterine glands become enlarged, and the bloodvessels dilated; subsequently, fatty degeneration of the superficial epithelium and the epithelium of the glands occurs, leading to laceration of the vessels and destruction of the affected area of tissue; after the cessation of the bleeding, regeneration of the mucous membrane occurs.

According to _Gebhard_, three stages may be distinguished. The first stage is that of premenstrual congestion, or stage of engorgement: the capillary vessels of the mucous membrane become distended with blood, the membrane itself becomes softened, the meshes of the stroma become enlarged and are filled with the morphological constituents of the blood, subepithelial hæmatomata are formed. The second stage is that in which the blood finds its way to the exterior: owing to the turgescence of the mucous membrane the blood is able to exude between the cells of the intact epithelium; further, the epithelium becomes lacerated in various places where hæmatomata have formed beneath it, allowing the blood to exude through the apertures thus formed; shreds of epithelium may be washed away by the blood-stream. The third stage is that of post-menstrual regeneration: the swelling of the mucous membrane disappears, the detached areas of epithelium readhere, the blood effused into the interstices of the tissue is reabsorbed, or is in part transformed into yellowish-brown flakes of pigment. According to _Gebhard’s_ view, during menstruation destruction of the uterine mucous membrane does not occur. At no time is the membrane denuded of large areas of epithelium; a very active process of regeneration occurs, however, in the superficial epithelium and the epithelium of the glands, which fits the uterine mucosa for the reception of the fertilized ovum by keeping it in an ever-young and renovated condition. The mucous membrane of the cervix takes part in menstruation at most by an increased secretion of mucus.

According to _Landau_ and _Rheinstein_, the mucous membrane of the Fallopian tubes contributes to the menstrual hæmorrhage; _Fritsch_ and _Strassmann_, however, are opposed to the view that there is a regular tubal menstruation.

_Pathology of Menstruation._

Only a small proportion of girls and women are entirely free, at the time of menstruation, from all change both in their bodily and in their mental state. A very great majority complain of feeling more or less unwell, of sensations of weight and pressure in the hypogastric region, of a general feeling of languor, loss of appetite, headache, irritability, sometimes of an inclination to weep; in women, a change in the intensity of the sexual impulse manifests itself, an increase in some, a decrease in others.

Not infrequently during menstruation, the cardiac activity is notably affected, so that, regularly at the commencement of each period, disagreeable sensations occur in the cardiac region, with increased frequency of the heart’s action; or complaint is made of coldness and dampness of the hands, of icy coldness of the feet, which feel as if “dead” to half way up the calves, and cannot be warmed—phenomena which, in the cases under consideration, occur only at the time of menstruation, and are to be regarded as manifestations of the menstrual reflex.

I examined 140 women in whom the heart and the vascular system were normal, during a number of successive menstrual periods, and in 12 of these women, either at the commencement or during the course of the flow, I observed an increase in the frequency of the heart to the extent of from 12 to 28 beats per minute; in young girls, a systolic murmur was sometimes audible during menstruation, but was inaudible in the intermenstrual intervals. In all these persons, menstruation was regular; there was no abnormality in respect either of the duration or of the quantity of the flow. The heart in these cases was, therefore, affected by the normal menstrual process.

A remarkable illustration of the alleged influence of menstrual disturbances on the pulse is reported by _de Villeneuve_, who states that Chinese physicians, being accustomed to feel the pulse in many different arteries, are able, by a comparison of the characters of the pulse in the two arms, to determine whether a woman menstruates regularly or irregularly.

Many women and girls show well-marked menstrual molimina, uneasy or actually painful local sensations in the genital organs, sacrache, painful uterine contractions, and disturbances of the general constitutional state, which are dependent upon menstrual congestion of the pelvic organs, upon local engorgement; sometimes such symptoms are the result of uterine contractions caused by hyperæmia of the uterus, and these cases often take a paroxysmal form.

Important disturbances of the general constitutional state result from sudden suppression of the normal menstrual flow, such as may be the effect of a severe chill, of sudden mental impressions, even of errors in diet or the use of certain drugs, and may sometimes follow artificial withdrawal of blood.

In many women, a few days or it may be a few hours only before every menstruation, changing manifestations of manifold disorders may recur. Among these may be mentioned, general excitement of the nervous system, notable alteration in the voice, strong inclination to sadness, tearfulness, erotic longings, great irritability and sensitiveness of the sensory system, drowsiness, flushings of the face, giddiness, swooning. The appetite is impaired, the breath has a disagreeable smell, the digestion is disturbed, there is a tendency to diarrhœa; the facial aspect may be altered, there are blue rings round the eyes, eruptions on the skin, tendency to sweating, palpitation and feeling of anxiety, and a sensation in the extremities as if they had been beaten. Local symptoms also occur: disturbances of the function of micturition, swelling of the breasts, pains and colics in the renal region, feeling of warmth in the genital organs, pruritus vulvæ, sensation of weight in the uterus, and a strong impulse toward coition. The secretions may be pathological, sometimes there are profuse sweats, sometimes profuse mucous or bilious diarrhœa, whilst the urine may either be very abundant, almost colorless, and nearly free from saline matter, or thick and overladen with phosphates and urates.

_Schauta_ writes regarding the complex of menstrual phenomena which occur in normal menstruation: “In the process of menstruation, blood and sanguineous mucus find their way through a mucous canal, the normal calibre of which is merely a capillary fissure. If the flow is slow, without the formation of coagula, and if the passage through the cervix is free, very gentle contractions of the uterine muscle suffice on the whole, as the blood exudes into the cavity of the uterus, to expel it into the vagina. Without such contractions, menstruation is hardly conceivable. Physiologically, they are characterized by a bearing-down sensation, passing down toward the thighs, and by pains in the back. It is rarely, that no pain at all is experienced; there are some women, however, who affirm that in their case menstruation begins quite unexpectedly, and without the slightest warning; but it does not follow that contractions of the uterus do not occur in these women also during menstruation. * * * The local disturbances which occur as an accompaniment even of physiological menstruation are, a sensation of fulness and weight in the pelvis, and pains in the lower part of the back, and these probably all result from the uterine contractions. The general disturbances of a reflex nature consist of tenderness on pressure in the epigastrium, headaches, general sense of languor, irritability, and an inclination to shed tears. Among changes in the functions of remote organs may be mentioned, swelling of the breasts, of the vocal cords, and of the thyroid body, increased respiratory capacity shortly before menstruation followed by rapid decrease during the flow, tendency to diarrhœa, nausea, vomiting, flatulence, salivation, profuse secretion of the sebaceous glands of the vulva, increased secretion of sweat, tendency to the formation of acne pustules. The mental condition also exhibits as a rule a considerable change during menstruation, even in cases which cannot in any sense be regarded as pathological. In many instances, an apparently normal woman may during menstruation exhibit a mental state so abnormal that we are led to speak of it as a menstrual psychosis. Apart from this, however, it appears that during menstruation the mental life of woman never remains entirely unaffected. Finally, we must mention certain changes in the sense-organs which not infrequently accompany menstruation, such as herpes conjunctivæ, exophthalmos, limitation of the visual field, and swelling of the nasal turbinate bodies.”

In the digestive organs, during the menstrual process, changes in the secretions of the glands, nausea, vomiting, and flatulence are not infrequently observed. In one-half of the women concerning whose state during menstruation _Krieger_ made inquiries, he found, especially just before and during the discharge, a tendency to diarrhœa, or at least to more copious and more frequent evacuations of the bowels than occurred at other times. On the surface of the tongue, at the premenstrual epoch, a pronounced exfoliation of the epithelium may occur, so that in some instances the papillæ are entirely exposed.

Not infrequently hyperæmia of the liver appears to be connected with the menstrual process; and by many observers, among whom _Senator_ and _Fleischmann_ may be mentioned, jaundice, slight or intense, has been seen to occur during menstruation. In a case of long-standing amenorrhœa, _Duncan_ noted the appearance of a transient vicarious jaundice, apparently reflex in its origin. In some cases, jaundice precedes menstruation, and disappears as the flow becomes established.