The formation of the penis is stimulated by a specific testosterone in the embryo.Without the hormone, the genitals of the embryo will develop into a female vagina.From the penis to the bottom of the testicles, you can see traces after merging.Some embryos are not fully merged, so there will be a opening under the penis.Surgical repair must be surgery, otherwise urine may flow out of the penis.
Penis (Penis) can be divided into three parts: head, body and root.The back end is the root of the penis, hidden on the deep surface of the scrotum and the skin of the perineum, and is fixed to the lower pubic branches and the sciatica, which is the fixed department.The middle part is the penile body, with cylindrical shape, and is hung by the ligament to the front and lower of the pubic bone combination.The front of the penis is mostly the head of the penis, and the tip of the head has a sagittal and narrow urethral exterior (External OrIFIFICE of URETHRA).The thinner part of the head is the penis neck.
The penis is mainly composed of two penis sponge bodies and a urethral sponge body, and the outer bread is fascia and skin.Cavernous Body of Penis is a thin cylinder at both ends, with one left and one, located on the back of the penis.The left and right are closely combined, extending forward, the tip of the tip is thin, and embedded in the depression behind the penis head.The back of the penis sponge is separated from the left and right of the penis, which is called the penis feet, which are attached to the pubic branches and sciatica on both sides.Cavernous body ofurethra is located on the abdomen of the penis sponge, and the urethra runs through its total length.The middle part is cylindrical, the front end is expanded to the head of the penis, and the back end is called the Bulb of Uretthra. It is located between the two penis feet and is fixed below the urine genital diaphragm.Each sponge body is covered with a thick and dense fibrous membrane, which is called the white film of the penis sponge and the white film of the urethral sponge.The interior of the sponge body is composed of many sponge bodies and gaps, and the gap is a sinus gap that communicates with the blood vessels.When the gap is congested, the penis becomes thicker and hardened.The three sponge bodies are shallow, deep penile fascia and skin.
The skin of the penis is thin and soft, stretched, and has no fat tissue.The skin is closely attached to the head and neck, and the rest is loose and easy to free. The penile skin is folded forward from the neck to form a double -layer ring skin with the head of the penis. Penis).The foreskin of the foreskin is surrounded by the foreskin mouth, on the midline of the penis head and abdomen, and the skin folds between the lower end of the urethral and the foreskin, called the foresley tiece.When cutting the puzzle, you should pay attention not to hurt and the foreskin straps, so as not to affect the normal erection of the penis.
The child's foreskin is long, with the entire penis head, and the foreskin mouth is small.With the increase of age, the foreskin gradually shrinks, and the foreskin mouth gradually expands.If the foreskin covers the outer mouth of the urethra, it is called the foreskin too long when it can reveal the outer mouth of the urethra and the penis head.When the foreskin mouth is too small, the foreskin is completely covered with the penis head and cannot be opened, it is called phimosis.In these two cases, inflammation caused by the stimulation of dirt in the foreskin cavity can also become a factor that induce penile cancer.
