The Sexual Life of the Child. Albert Moll
only to the families of the writers, and in part because many of them were in intention purely private memoranda, a written record for the sole use of the writer.
Speaking generally, however, this province of research has received but little scientific attention; and of comprehensive studies, intended to throw light on every aspect of the sexual life of the child, not a single one is known to me.
CHAPTER II
THE SEXUAL ORGANS—THE SEXUAL IMPULSE
A proper understanding of physiological functions is based upon anatomical knowledge of the organs concerned. For our purpose, therefore, a knowledge of the sexual organs of the child is essential. The proper course, in this instance, appears to be to start with an account of the adult organs, and then to describe the distinctive characteristics of the same organs in the child. Let us, then, begin with the organs of the adult man.
The membrum virile or penis is visible externally, and behind it is situated the scrotum. Within this latter are two ovoid structures, named testicles or testes. Each testicle is enveloped in a fibrous capsule, known as the tunica albuginea, from which fibrous septa pass into the interior of the organ, thus dividing it into a number of separate lobules. Each lobule is composed of seminiferous tubules, which are greatly convoluted and likewise branched, the branches being continuous with those of neighbouring tubules, both within the same lobule, and (by perforating the fibrous septa) in adjoining lobules. In the walls of the seminiferous tubules the spermatozoa are formed. The seminiferous tubules unite to form the efferent ducts (vasa efferentia), about a dozen in number for each testicle; immediately passing out of the testicle, these efferent ducts make up the epididymis, situated at the upper and back part of the testicle. After numerous convolutions, these unite at length on each side to form a single canal, which leaves the epididymis under the name of the vas deferens; this is the excretory duct of the testicle, conveying the secretion of that organ to the exterior. The vas deferens traverses the inguinal canal into the abdominal cavity, and therein passes downwards to the prostatic portion of the urethra (vide infra). The anterior portion only of the penis is visible externally, dependent in front of the scrotum; the posterior portion is concealed by the scrotum and the skin of the perineum. The terminal segment of the penis is formed by the glans, which is covered by the foreskin or prepuce. This last is sometimes artificially removed: either on ritual grounds, as, for instance, among the Jews; or for medical reasons, for example, when the preputial orifice is greatly constricted. At the anterior extremity of the glans penis is the orifice of the urethra (meatus). The urethra is a canal running through the entire length of the penis, opening by its proximal extremity into the urinary bladder, and serving for the passage of the urine from the bladder to the exterior of the body. The main substance of the penis is composed of three cavernous bodies, the paired corpora cavernosa penis, and the single corpus spongiosum, or corpus cavernosum urethræ. These consist of what is known as erectile tissue, a spongy mass within whose lacunar spaces a large quantity of blood can, in certain conditions, be retained. When this occurs, the penis becomes notably thicker and longer, and simultaneously hard and inflexible. This process is known as erection of the penis, and is requisite to render possible the introduction of the organ into the genital canal of the female.
The proximal segment of the urethra is surrounded by the prostate gland. The secretion of this gland is conveyed into the urethra by numerous short ducts, known as the prostatic ducts. Behind the prostate, at the base or fundus of bladder, are the paired seminal vesicles. The duct of the seminal vesicle joins the vas deferens of the same side (both functionally and embryologically the seminal vesicle is no more than a diverticulum of the vas deferens); passing on under the name of the common seminal or ejaculatory duct, the canal opens into the prostatic portion of the urethra (the orifices of the two common seminal ducts are in the folds of mucous membrane forming the right and left lateral margins of the prostatic utricle or uterus masculinus). These ducts convey the secretion of the testicles into the urethra along which canal it passes to the exterior. Behind the posterior part of the urethra, but distal to the prostate gland, are situate also the paired glands of Cowper, or suburethral glands, whose excretory ducts likewise open into the urethra. There are glands also in the walls of the seminal vesicles, the vasa deferentia, and the urethra; the urethral glands are commonly known as the glands of Littré.
As previously mentioned, it is in the testicles that the secretion necessary for the reproductive act is prepared. This secretion is evacuated during sexual intercourse, and also during masturbation and involuntary seminal emissions. The testicular secretion is a tenacious fluid. When examined microscopically, it is seen to contain countless spermatozoa, structures about 50 [Greek: m] (⅕00 inch) in length, with a thick head and a long filiform tail. They represent the male reproductive cells, which during coitus are introduced into the interior of the female reproductive organs; a single spermatozoon unites with the ovum of the female to form the fertilised ovum. The spermatozoa are formed in the walls of the convoluted seminiferous tubules. The cells lining these tubules are of several different kinds (although in childhood they are not differentiated as they are after the puberal development has taken place). One variety of these cells, the spermatogonia, undergo an increase of size at puberty, and from these spermatogonia, after passing through several intermediate transitional stages, the spermatozoa are formed.
It was formerly believed that the sole function of the testicles was the production of the spermatozoa; recently, however, the opinion has gained ground that these organs have in addition another specific function, that of internal secretion. Whilst the spermatogonia become transformed into spermatozoa, other cellular structures of the testicle, more especially the interstitial cells, produce, it is assumed, the internal secretion of the gland. The constituents of this internal secretion, having been poured into the general circulation, are supposed to give rise to the specific masculine sexual development, and, in particular, to lead to the appearance of the secondary sexual characters. This matter will subsequently be discussed in detail, and here I shall merely add that perhaps none of the proper constituents of the internal secretion find their way into the external secretion of the testicle.
This external secretion of the testicles does, however, receive the admixture of a number of other secretions, to constitute the semen as actually discharged, viz., the secretion of the prostate gland, that of the seminal vesicles, Cowper's glands, and the glands of the vasa deferentia, and perhaps also that of the glands of Littré. The term semen is, indeed, often applied to the secretion of the testicles alone; but to avoid misunderstanding, Fürbringer8 recommends that only the mixed secretion, as actually discharged, should be spoken of as the semen, and that this term should never be employed to denote the testicular secretion alone.
In what has gone before, I have not only described the structure of the male sexual organs, but have alluded also in passing to their functions. These latter must, however, be described more fully. Let us begin with erection, which, as we saw, is due to distension of the penis with blood. How is this distension brought about? It results from stimulation of the erection centre. Until recently, it was supposed that this centre was situated in the lumbar enlargement of the spinal cord; but now, owing to the researches of L. R. Müller, it is believed to form part of the sympathetic plexuses of the pelvis. Stimulation of the centre leads to distension of the penis with blood, and thus to erection of that organ. The stimulation of the centre can be effected in either of two ways.
In the first place, by psychical processes. Thus, in a man, the sight of a woman exercises such a stimulus, the stimulation proceeding from the brain along the spinal cord to reach the centre. The psychical stimulus may also consist of reminiscences. In this way the memory of an attractive woman may be just as effective in causing erection as if she were actually visible at the moment; reading erotic literature may have the same result. When the sexual impulse is perverted, the ideas causing erection will naturally be themselves of a perverse character. Thus, in the homosexual