Scrotum (scrotum) is a protrusion of the anterior abdominal wall, which has two disconnected chambers for the male genital glands. The scrotum is located down and behind the root of the penis. Inside the scrotum and in each of its cells is the male sex gland.
The scrotum distinguishes 7 layers (shells), which are also called the shells of the testicle:
- leather (cutis);
- fleshy shell (tunica dartos);
- external seminal fascia (fascia spermatica externa);
- fascia of the muscle that lifts the testicle (fascia cremasterica);
- muscle lifting an egg (m.cremaster);
- internal seminal fascia (fascia spermatica interna);
- the vaginal envelope of the testicle (tunica vaginalis testis), in which two sheets (two plates) are isolated: a parietal lamina (lamina parietalis) and an inner lamina (lamina visceralis).
The skin of the scrotum is thin, easily forms folds, has a darker coloration than in other parts of the body, is covered with numerous hairs. Under the skin is a fleshy shell (tunica dartos), formed from the subcutaneous connective tissue of the inguinal region and perineum and replacing the subcutaneous fatty tissue. In the fleshy shell there are bunches of smooth muscle cells and elastic fibers. There are no fat cells in it. The fleshy shell forms the scrotum septum (septum scroti), separating the right testicle from the left one. On the surface of the scrotum of the attachment line of the septum there corresponds a seam of the scrotum (raphe scroti), having a sagittal direction. Deeper lies the external seminal fascia, which is the derivative of the superficial fascia of the abdomen. Under it is the fascia of the muscle that lifts the testicle, formed from the fascia of the outer oblique abdominal muscle and partly from the fibrous fibers of its aponeurosis. Then the mice that lifts the testicle (m.cremaster), consisting of muscle beams, branching from the transverse and internal oblique muscles of the abdomen, are located. Inside the muscle is the inner seminal fascia - the derivative of the transverse fascia of the abdomen. The inner seminal fascia fuses with the parietal plate of the vaginal shell of the testicle, which at the posterior margin of the testicles passes into its internal (visceral) plate, which covers the testicle and epididymis. Between the visceral and parietal plates there is a slit-shaped closed cavity - a derivative of the peritoneal cavity.
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