II. SPINAL NEUROSES.
1. Affections of the Erection Centre.
(a) Irritation (priapism) arises reflexly from peripheral sensory irritants (e.g., gonorrhœa); directly, from organic irritation of the nerve-tracts from the brain to the erection centre (spinal disease in the lower cervical and upper dorsal regions), or of the centre itself (certain poisons); or from psychical irritation. In the latter case satyriasis exists, i.e., abnormal duration of erection, with libido sexualis. In simply reflex or direct organic irritation, libido sexualis may be wanting, and the priapism be accompanied by unpleasant feelings.
(b) Paralysis from destruction of the centre or of the nerve-tracts (nervi erigentes), in diseases of the spinal cord (paralytic impotence). A milder form is that of lessened excitability of the centre, resulting from overstimulation (in sexual excesses, especially in onanism), or from alcoholic intoxication, abuse of bromides, etc. It may be accompanied by cerebral anæsthesia, and often with anæsthesia of the external genitals. Cerebral hyperæsthesia is here more frequent (increased libido sexualis, lust). A peculiar form of diminished excitability is shown in those cases where the centre responds only to certain stimuli. Thus there are men for whom sexual contact with their virtuous wives does not supply the necessary stimulus for the excitation of an erection, but in whom it occurs when the act is attempted with a prostitute, or in the form of some unnatural sexual act. As far as psychical stimuli are here concerned, they may be inadequate (v. infra, paræsthesia and perversion of sexual instinct).
(c) Inhibition. The erection centre may become functionally incapable as a result of cerebral influence. This inhibitory influence is an emotion (disgust, fear of contagion), or an idea[[30]] of impotence. There are many men in the first condition who have an unconquerable loathing for their wives, or fear of infection, or are suffering with perverse sexual feelings. In the latter condition are neuropathic individuals (neurasthenics, hypochondriacs), frequently weakened sexually (masturbators), who have reason, or think they have, to mistrust their sexual power. This idea acts as an inhibitory concept, and makes the act with the person concerned of the opposite sex temporarily or absolutely impossible.
(d) Irritable weakness. In this condition there is abnormal impressionability of the centre, but accompanied by rapid diminution of its energy. There may be functional disturbance of the centre itself, or weakness of the innervation through the nervi erigentes; or there may be weakness of the ischio-cavernosus muscle. Cases in which the erection is ineffectual, on account of abnormally early ejaculation, form a transition to the following anomalies:—
2. Affections of the Ejaculation Centre.
(a) Abnormally easy ejaculation from absence of cerebral inhibition, resulting from excessive psychical excitement or irritable weakness of the centre. In this case, under certain circumstances, the simple conception of a lascivious situation is sufficient to set the centre in action (high degree of spinal neurasthenia, usually resulting from sexual abuse). A third possibility is hyperæsthesia of the urethra, by virtue of which, when the semen enters it, an immediate and excessive reflex action of the ejaculation centre is induced. In such a case, simple proximity to the female genitals may be sufficient to induce ejaculation (ante portam).
In case of hyperæsthesia of the urethra as a cause, the ejaculation may be accompanied by painful, instead of pleasurable, sensations. Usually, in cases where there is hyperæsthesia of the urethra, there is, at the same time, irritable weakness of the centre. Both functional disturbances are important in the production of pollutio nimia and diurna.
The accompanying pleasurable feeling may be pathologically absent. This occurs in defective men and women (anæsthesia, aspermia?), and, further, as a result of disease (neurasthenia, hysteria); or (in prostitutes) it follows overstimulation and the blunting thus induced. The intensity of the pleasurable feeling depends on the degree of psychical and motor excitement accompanying the sexual act. Under pathological conditions this may become so pronounced that the movements of coitus take on the character of involuntary convulsive movements, and even pass into general convulsions.
(b) Abnormally difficult ejaculation. It is occasioned by inexcitability of the centre (absence of libido, paralysis of the centre: organic, from disease of brain or spinal cord; functional, from sexual abuses, marasmus, diabetes, morphinism), and, in this case, for the most part, in connection with anæsthesia of the genitals and paralysis of the erection centre. Or it is the result of a lesion of the reflex arc, or of peripheral anæsthesia (urethra), or of aspermia. The ejaculation occurs not at all, or tardily, in the course of the sexual act, or only afterward, in the form of a pollution.