Hemodynamics of penile erection and the physiological process of ejaculation

When psychogenic and reflexive erections occur, stimulation information (including psychological stimuli and...)

After the reflex stimulus is received, the erection center in the lumbar spinal cord sends a command, which is transmitted via the neural pathway to...

The command is transmitted to the arteries responsible for supplying blood to the penis. Normally, these arteries supply blood to the cavernous body.

A suitable amount of blood is injected into the body and then returns via the veins. Once the nerves are excited, these small arteries dilate.

During erection, the penile tissues become engorged with blood, resulting in an erection. Conversely, arterial constriction blocks blood flow.

The large influx of blood and increased venous return cause the penis to soften until it returns to a state of relaxation.

state.

Studies have found that in normal men, when there is no sexual arousal and the penis is flaccid, blood flows through the penis.

The corpora cavernosa move very slowly and are few in number, only about 4 milliliters per minute. But when sexually aroused...

During the stage of penile erection, blood flow can suddenly increase to 80-120 ml per minute.

(Average 100 ml), almost 25 times the volume in the flaccid state, after full erection, in order to maintain...

Maintaining this erection, especially keeping the penis at a certain level of rigidity, requires a speed of 20 beats per minute.

40 ml of blood enters the corpora cavernosa of the penis. These figures are representative of most...

The state of penile erection in men varies, but due to differences in race, country, region, and physique, it can vary from person to person.

There can be some differences in erectile function between individuals.

Why do men ejaculate?

Ejaculation is the specific manifestation of a man's sexual physiological activity reaching its peak. Generally speaking, with ejaculation...

The occurrence of ejaculation is accompanied by an orgasm, which then subsides.

Ejaculation is primarily controlled by the nervous system, and the process is roughly as follows: [The text abruptly ends here, likely due to an incomplete sentence or missing information.]

Erection creates favorable conditions for ejaculation, namely, the elongation of the urethra and the previously curved tube.

The cavity becomes straighter and wider (at least three times larger than usual), essentially turning a rugged mountain road into a two-way road.

Four lanes. As intercourse progresses, the nerve endings in the glans penis are continuously stimulated, even...

Both psychological stimuli and psychogenic stimuli are continuously transmitted to the relevant nerve centers. After 2–6 minutes or more...

Prolonged friction, with the accumulation of localized stimulation reaching a certain intensity, can trigger ejaculation.

When the stimulation "threshold" is reached, an orgasm is triggered, and the ejaculation center in the lumbar spinal cord sends out an ejaculation signal.

At this command, ejaculation begins.

Simply put, ejaculation is a process involving the contraction of multiple organs and muscle groups. Although the duration of ejaculation...

It is a very short process, but multiple organs are involved in stages.

In the first stage, with penile erection and the accumulation of sexual stimulation, the testicles contract first, followed by...

This involves the epididymis, vas deferens, seminal vesicles, and prostate gland contracting in succession, which then expel the semen through the ejaculatory ducts.

The process of stimulating the posterior urethra is similar to pulling the trigger of a gun, hence this stage is called "stimulation."

"Send"; at the same time, the gate that is usually responsible for urination (bladder neck) contracts and closes to prevent urination.

During the first stage, semen "reverses" and enters the bladder.

In the second stage, the accumulation of semen in the posterior urethra triggers a spinal reflex, causing a reaction around the urethra and perineum.

The muscles in the genital area contract strongly, allowing semen to be ejected smoothly from the urethra.

Because muscle contractions have a certain rhythm, the ejaculation process also occurs according to this rhythm, manifesting as...

Semen is ejaculated in spurts. These contractions are strongest in the first 2-3 ejaculations, allowing the semen to be released in gushes.

The semen is ejected 30-60 centimeters from the urethral opening, and the amount of semen is also large. This is followed by 4-5 contractions.

The intensity decreases, the amount of semen ejected decreases, and the range is shortened.

Therefore, it can be seen that the contractions of various sexual organs occur at slightly different times during ejaculation.

Therefore, although the entire process of ejaculation is completed in just a few seconds, it actually involves the formation of semen...

Looking at it separately, it can be divided into three steps: first, the urethra contracts, ejecting 0.1 to 0.2 ml of urethra.

The prostate gland releases prostatic fluid, followed by prostatic fluid ejected during prostate contraction, while the testes simultaneously release sperm.

The posterior seminal vesicle contracts and ejaculates seminal fluid, totaling 2-5 ml of semen. The prostate gland contains...

Glandular fluid accounts for about 1/3, seminal vesicle fluid accounts for about 2/3, and bulbourethral gland fluid is very little, with sperm making up the majority of the volume.

Less than 0.1%. Meanwhile, this process shows that the first third of the semen is rich in sperm, while the latter...

Two-thirds of the sperm counts were reduced.

During ejaculation, men subjectively experience a state of excitement and intense euphoria.

(Sexual pleasure), reaching orgasm. This is an actual sensation in the brain that elevates a person's emotions.

Entering a state of extreme excitement. The intensity of an orgasm depends to some extent on the perineal muscles.

The rhythm and intensity of muscle contractions, and the specific mechanisms involved, remain unclear. In a male during a single contraction...

During sexual intercourse, orgasm typically occurs only once. From a biological perspective, this type of orgasm...

The emergence of this is of great significance.

First, it symbolizes the end of a sexual encounter, but it can also become a sexual experience.

In the future, the desire for sex will be based on this sexual experience and desire, which will allow humanity to understand sex.

Only when interest arises can humanity and society continue to reproduce and exist.

Secondly, the likelihood of achieving an ideal orgasm is often directly related to the frequency of sexual activity.

If sexual activity is moderate or there is no sexual activity for a relatively long period, the orgasm is generally intense; if sexual activity occurs...

Too frequent sexual activity can lead to less than ideal orgasms, which may be short-lived, weak in intensity, or result in mild or imperceptible sensations.

Phenomenon.

Third, the quality of orgasm is also related to age; the quality of orgasm varies in middle-aged and elderly individuals.

It will gradually deteriorate, with the quality being relatively better during the young and middle-aged years.

There are several issues regarding male ejaculation that must be understood: ① Ejaculation is influenced by psychological factors.

The influence of this can lead to abnormal psychological activity, such as fear of premature ejaculation or inability to satisfy the female partner.

Factors such as anxiety or worry about the woman's pregnancy can interfere with brain activity, producing inhibitory reflexes, and subsequently...

The nerve reflexes that block normal ejaculation occur, thus causing ejaculatory dysfunction. ② Localization of the sexual organs

The "threshold" of tactile stimulation is very important, requiring that such stimulation must reach a sufficient level.

Intensity is needed to trigger ejaculation; therefore, intercourse requires movements of a certain frequency and amplitude.

This allows sexual stimulation to accumulate over time. In fact, in clinical practice, some patients lack...

Involuntary ejaculation is not caused by any disease, but is related to the act of sexual intercourse. ③ Long-term masturbation can lead to premature ejaculation.

Ejaculatory dysfunction is more likely to occur, mainly because the local stimulation of the genitals during masturbation is greater than that during sexual intercourse after marriage.

The sexual organs of frequent masturbators become accustomed to only becoming aroused under strong stimulation from masturbation.

The form raises the "threshold" of sexual stimulation; in contrast, if intercourse does not reach this "threshold," the effect is less pronounced.

If the penis is flat, it will cause ejaculation disorders.