Figure 2

epididymis

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Epididymis is an organ composed of many tortuous and tiny tubes, one side is connected with the vas deferens, and the other side is connected with the seminiferous tubules of Testis. When the sperm leaves the testis, it runs into the epididymis and continues to grow and mature. Epididymis is located at the upper end and the rear edge of testis. The epididymal tube is about 4-5 meters long, and it bends to form the body and tail. Helps sperm mature.

Epididymis is close to the upper end and the rear edge of testis, and can be divided into three parts: head, body and tail. The head is made of an output tubule, and the end of the output tubule is connected with an epididymal duct. The epididymal canal is about 4-5 meters long, and it is coiled to form the body and tail. The end of the tube turns sharply upward and continues directly into a vas deferens. Besides storing sperm, epididymal duct can secrete epididymal fluid, which contains some hormones, enzymes and specific nutrients, which are helpful for sperm maturation.

Chinese name

epididymis

foreign name

epididymis

location

Close to the upper and rear edges of testicles.

structure

Head, body and tail.

ductus epididymidis

It is about 4-5 meters long.

Structural anatomy

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The testicles are ovoid, one on the left and one on the right, weighing about 20-30g, with a longitudinal diameter of 4.3-5. 1 cm, a width of 2.6-3. 1 cm and a thickness of 2-3cm. Its normal volume is15-25ml, which is about 20ml for most normal people. Testis is a retroperitoneal organ during embryonic development, which is normal.

epididymis

A baby boy, at birth, the testicles have descended into the scrotum from the inguinal canal. In the process of descent, the two layers of peritoneum are used as the envelope covering the testis, which is called the tunica vaginalis. A small amount of fluid is accumulated in the space between them, which is called testicular tunica vaginalis. The tunica vaginalis of the inner layer of testis and the tunica propria of testis form a dense and thick white membrane. Observing the testicular section with naked eyes, the essence can be picked out by the needle tip. Microscopically, the testicular parenchyma is divided into 100-200 conical lobules, and each lobule contains 2-4 tubules with a length of about 30-80 cm and a diameter of 150-250 microns, which can produce sperm by bending, and are called curved seminiferous tubules. It is estimated that if the seminiferous tubules of one testicle are connected, the total length can reach 255 meters. The loose connective tissue between seminiferous tubules is called leydig. The convoluted seminiferous tubules of each leaf converge into straight seminiferous tubules to the posterior margin of testis, which are then anastomosed to form testicular reticulation, and then converge into 8- 15 output tubules, which pass through the posterior upper margin of testis and connect with the head of epididymis. There are three kinds of cells with special functions in testis, including spermatogenic cells and supporting cells on the wall of seminiferous tubules and interstitial cells in testis.