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. The Male Reproductive System >
The Male Reproductive : System: Launch
The male reproductive system system is made up of the souffrance, genital ducts, accessory glands, and penile (Figure 21â€" 1). The dual function of the testis is to generate spermatozoa and hormones. The genital ducts and accessory glands develop secretions that, aided by simply smooth muscles contractions, perform spermatozoa toward the exterior. These kinds of secretions can provide nutrients pertaining to spermatozoa while they are limited to the male reproductive system tract. Spermatozoa and the secretions of the genital ducts and accessory glands make up the semen (from Latina, meaning seed), which is released into the girl reproductive system through the penis. Although testo-sterone is the main junk produced in the testes, the two testosterone and one of its metabolites, dihydrotestosterone, are essential for the physiology of men. Number 21â€" 1 )
The male penile system. The testis as well as the epididymis will be shown in different scales compared to the other parts of the reproductive program. Note the communication between testicular lobules.
Every single testis is surrounded by a thick capsule of heavy connective muscle, the tunica albuginea. The tunica albuginea is thickened on the detras surface from the testis to form the mediastinum testis, that fibrous septa penetrate the gland, dividing it in about two hundred and fifty pyramidal spaces called the testicular lobules (Figure 21â€" 2). These types of septa will be incomplete, and there is frequent inter-communications between the lobules. Each lobule is occupied by someone to four seminiferous tubules enmeshed in a world wide web of loose connective tissue that is abundant with blood and lymphatic ships, nerves, and interstitial cellular material, also known as Leydig cells. Seminiferous tubules produce male reproductive : cells, the spermatozoa, while interstitial cells secrete testicular androgens. Number 21â€" 2 .
Ducts with the testis and the ductus epididymis.
During wanting development the testes develop retroperitoneally in the dorsal wall structure of the belly cavity. They migrate during fetal expansion and become placed within the ball sack, at the ends of the spermatic cords. Because of this migration, each testis bears with it a serous sac, the tunica vaginalis, derived from the peritoneum. The tunic involves an external parietal layer and a great inner pasional layer, in the tunica albuginea on the susodicho and horizontal sides in the testis. Seminiferous Tubules
Spermatozoids are produced in the seminiferous tubules at an everyday rate of around 2 back button 108 in the adult. Every single testicle has 250â€" 1000 seminiferous tubules that assess about 150â€" 250 m in size and 30â€" 70 cm in length. The combined length of the tubules of just one testis is around 250 meters. The tubules are convoluted and have the kind of loops at whose ends the lumen narrows and continues to put it briefly segments, generally known as straight tubules, or tubuli recti (Figure 21â€" 2). These tubules connect the seminiferous tubules to an anastomosing labyrinth of epithelium-lined channels, the organizzazione testis. About 10â€" twenty ductuli efferentes connect the rete testis to the cephalic portion of the epididymis (Figure 21â€" 2). The seminiferous tubules happen to be lined which has a complex stratified epithelium named germinal or perhaps seminiferous epithelium. Their exterior wall is usually surrounded by a well-defined basal lamina and a fibrous connective muscle consisting of several layers of fibroblasts (Figure 21â€" 3). The innermost layer, sticking with the principal lamina, contains flattened myoid cells (Figure 21â€" 4), which have attributes of clean muscle. Interstitial (Leydig) skin cells occupy much of the space between seminiferous tubules (Figures 21â€" 3 and 21â€" 4). Figure 21â€" 3.
Portion of a testis showing seminiferous tubules and groups of pale-stained interstitial (Leydig) cells (arrowheads). Pararosanilineâ€" toluidine blue (PT) stain. Channel magnification.
Determine 21â€" four.