Previous life.
The foreskin (prepuce) is undoubtedly an important male reproductive organ. Starting from embryology, to get to know it gradually ……
Genesis of the reproductive system
Although the genetic sex of the human embryo is determined at fertilization, it is not until the 7th week of embryonic life that the gonads are able to distinguish between the testes or ovaries, and the sex differentiation of the reproductive ducts as well as external genitalia is even later.
By the 6th week of embryonic life, both males and females have a pair of mesonephric ducts and a pair of paramesonephric ducts. The middle pararenal duct, also called Muller’s duct, occurs on the lateral side of the mesonephric duct, and is formed by the longitudinal groove formed by the depression of the epithelium of the corpora cavernosa, and the edge of the groove is healed, with its head opening in the ventral cavity and the upper part located on the lateral side of the mesonephric duct. If the gonads differentiate into testes, the interstitial cells secrete androgens that promote the development of the mesonephric ducts into epididymal ducts, vas deferens and ejaculatory ducts; the supporting cells produce anti-mesonephric hormones that inhibit the development of the mesonephric ducts and cause their gradual degeneration.
Differentiation of external genitalia
At the beginning of the fifth week of embryonic life, a bulge, called the genital nodule, appears on the cephalic side of the urogenital sinus membrane, followed by two pairs of bulges on either side of the urogenital sinus membrane; the medial one is smaller, the urogenital fold; the lateral one is larger, the labial-scrotal bulge. Between the urogenital folds is a depression, the urogenital groove, and at the bottom of the groove is the urogenital sinus membrane. If the gonads differentiate into testes, the undifferentiated external genital progenitors develop in the male direction under the action of androgens produced by the testes; the genital nodes elongate to form the penis; the urogenital folds on both sides heal in the midline to form the urethral spongiosome; the labial-scrotal bulges close to each other and heal in the midline to form the scrotum. In short, very early, the little JJ has developed.
Think about it, if there is no foreskin cover to protect the glans, then later sensitivity is not too bad? So, the foreskin is a protective cover for the little JJ to come ……
The first thing you need to do is to get a good idea of what you are getting into. However, deliberate judgment for non-medical purposes is not allowed. Both men and women are equal, whether they are fetuses ……
Modern mothers and fathers, this, I believe you have also been very enlightened ……
this life
The local anatomy of the penis as well as the foreskin
The penis is divided into the penis root, the penis body and the penis head. The penis root is located within the triangle of the urogenital diaphragm in the perineum, including the right and left penile corpus cavernosum as well as the urethral bulb, fixed at the edge of the pubic arch as well as below the urogenital diaphragm. The body of the penis is cylindrical and dangles anteriorly below the pubic symphysis. The tip of the penis is an expanded portion of the end of the penis with a mushroom-shaped urethral opening, which is formed by the anterior expansion of the urethral corpus cavernosum, which has an external urethral opening at its anterior end. The base of the penile head has a free edge bulge called the crown of the penis head, under which is the coronal groove.
The penis consists of two penile corpus cavernosum on the dorsal side and one urethral corpus cavernosum in the ventral median. The penile corpus cavernosum is the main part of the penile day, the front end is more acute and embedded in the depression at the base of the penile head, and the posterior section posterior penile corpus cavernosum angle, which is fixed separately to the right and left pubic sciatic branches, is covered by the sciatic cavernous muscle. There is a longitudinal sulcus on the dorsal and ventral sides of the fused left and right penile corpus cavernosum.
The dorsal sulcus is shallow and has a central dorsal penile vein, which is flanked by the dorsal penile artery and the dorsal penile nerve. The ventral sulcus is deeper and the urethral corpus cavernosum is located within it. The posterior end is enlarged and is called the urethral bulb, which is surrounded by the bulbocavernosus muscle; the tip of the urethral spongiosa is significantly enlarged and is the head of the penis.
The spongiosa is an erectile tissue, and all three spongiosa are surrounded by their own envelope, the white membrane is a fibrous tissue structure. The outer part of the tunica albuginea is surrounded by the fascia of the penis (Buck’s fascia), which encloses the three corpus cavernosum together. Beyond the penile fascia is the superficial penile fascia, which is composed of loose connective tissue.
The skin of the penis is thin and soft, lacks subcutaneous fat, is stretchy, and has a great deal of mobility. The skin continues forward around the head of the penis and is called the prepuce, divided into inner and outer plates. The inner plate resembles mucous membrane, without keratinized layer and rich in sebaceous glands. There is a small fold of skin on the ventral side of the head of the penis, which is called the prepuce.
There are two ligaments of the penis, namely the ligament of the penis and the suspensory ligament of the penis. The ligament of the penis is shallow and is a bundle of elastic fibers that starts at the lower end of the ventral white line, divides into two bundles, and attaches to the penile fascia via both sides of the penis. The penile suspensory ligament, which is triangular in shape, is located on the deeper side of the penile ligament and starts from the lower part of the anterior pubic symphysis and attaches downward to the penile fascia, consisting of dense fiber bundles.
The arteries of the penis come from the internal pubic artery, and there are the dorsal penile artery as well as the deep penile artery, which have anastomosing branches to each other. The deep penile artery enters the corpus cavernosum and runs through the corpus cavernosum from near to far, reaching the tip of the corpus cavernosum forward and the foot of the penis backward. There are three main veins in the penis, namely the superficial dorsal penile vein, the deep dorsal penile vein, and the cavernous vein of the penis.
The superficial dorsal penile vein drains the foreskin as well as the penile skin blood flow. It enters the external pubic vein. The deep dorsal penile vein lies beneath the penile fascia, on either side of the dorsal penile artery, and crosses the urogenital diaphragm below the penile suspensory ligament to join the prostatic venous plexus. Blood flow from the penile corpus cavernosum returns to the penile corpus cavernosum vein, and a spinous vein anastomoses with the deep dorsal penile vein.
The lymph of the penis is divided into superficial and deep groups. Superficial lymphatic vessels collect lymph from the prepuce, penile skin, subcutaneous tissue and penile fascia, and the lymphatic vessels travel with the superficial dorsal penile veins. It is injected into the superficial subinguinal venous lymph nodes. The deep lymphatics collects lymph from the head of the penis and the corpus cavernosum of the penis, which travels with the deep dorsal penile vein and injects into the deep inferior inguinal vein lymph nodes, then through the inguinal canal to the external and common iliac lymph nodes.
The nerves of the penis are innervated and the trunk nerve is the dorsal penile nerve, which is located on both sides of the dorsal penile artery and branches to the penile skin, prepuce and head. The sympathetic nerve originates from the lumbosacral sympathetic chain and may reach the penis via the hypogastric, pubic and pelvic nerves.
Simply put, the penis is very sensitive and rich in blood flow. Therefore, some circumcised children will have edema that is very pronounced (in contrast to the rest of the body) and pain that is pronounced.