The structure and Function of the Penis
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The graphic penis consists of two sections – the penis head or glans penis and the penile shaft. However, the penis continues as a inexpressive buildings laying under the scrotum and reaching additional backward in the perineal area towards the prostate. When the penis is erect, also the perineum, the area between the legs will be swollen.
The urinary tube (urethra) goes from the bladder, then straight through the prostate, then enters this penile buildings just below the prostate and then goes send all the way to the tip of the penis.
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The Erectile Bodies
In the graphic penis and in the buildings extending backwards there are three bodies that swell during erection, erectile bodies. The bodies are mostly made of a tight mesh of fine blood vessels with very elastic walls. There are two bodies along the upper part of the penis (corpora cavernosa) that increase backwards under the scrotum. Then there is one body colse to the urethra (corpus spongiosum) that continues backwards to just under the prostate.
The arteries foremost blood to the erectile bodies and the veins foremost blood from these bodies have muscles in their walls that can close off or relax to regulate the blood flow to and from these bodies.
When the muscles at the entrance relax and those at the outlet constrict, blood is filled into the mesh by the blood pressure. The erectile bodies will then engorge as a balloon and get straight. The swelling and straightening of the erectile bodies will inflate the whole penis and make it erect. This activity is regulated by nerve impulses and the substance nitrogen oxide working as a local tissue hormone.
All the inner structures of the penis are surrounded by a robust sheet of elastic connective tissue, the fibrous envelope. In the area between the legs there is a sheet of muscles between the fibrous envelope and the perineal skin, the two bolbospongiosus muscles. These muscles contract during ejaculation and help to pump out the semen.
The Penile Skin
The penile skin is thick and robust. between the skin and the fibrous envelope, there is a thin area consisting of a soft and very elastic connective tissue. Therefore the skin can precisely be moved up and down along the penile shaft.
The penis head is covered by a thin skin which is very sensitive by means of a rich innervation. Still this thin skin is both strong and elastic. In increasing the skin in an uncircumcised penis is covered by a hood that is not stuck to the outside of the head after early infancy, the foreskin.
The foreskin is a continuation of the skin outside the shaft that goes to the tip of the penis and is then folded back inwards, production a duplicate layer, where the inner fold is fastened just under the penis head. between the two folds there are an very soft and elastic tissue.
The foreskin can precisely be retracted to show the bare penis head, and it uses to retract itself when the penis is erect. When the penis is not erect, the foreskin protects the penis head.
In early infancy the foreskin is fixed to the penis head, but will gently loosen, usually during early infancy, but in a preteen boy there can still be some adhesions left colse to the base of the head.
In some cultures it is custom to remove the foreskin for assorted reasons by an execution called circumcision., production the penis head enduringly exposed and visible. When circumcision is done in early infancy, the procedure also involves tearing the fixed foreskin loose from the outside of the head.
The skin of the penis head produces a white creamy substance called smegma which helps to lubricate the penis during intercourse. Smegma is a blending of oils secreted straight through the skin on the glans, cells loosened from the skin outside and substances produced by sebaceous glands on the inside of the foreskin. With improper hygiene too much smegma can get and give excessive bacterial growth and bad smell.
The Innervation And Blood furnish Of The Penis
The main nerves controlling the penile function and bringing sensual stimuli from the penis are the dorsal penile nerves, situated on both sides in the connective tissue of the upper side of the penis and branching out to all parts of the penis. Erection is controlled by sensual stimuli going to the spinal cord and operate impulses arrival back, both straight through this nerve. Ejaculation is controlled by other nerves going to the muscle sheet in the perineum and to all other structures involved in bringing the semen out.
The main blood furnish of the penis comes from the dorsal penile arteries going in the connective tissue at the upper side of the penis and branching off to all parts of the penile skin and inner penile structures.
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