The Male Reproductive System
· Intratesticular Genital Ducts
The intratesticular genital are the tubuli recti (straight tubules), the rete testis & the ductuli efferentes.
Most seminiferous tubules are in the form of loops, both end of which join the rete testis by structure known as tubuli recti, these tubules are recognized by the gradual loss of spermatogenic cells, with an initial segment in which only Sertoli cells remain to form their walls, followed by a main segment consisting of cuboidal epithelium supported by a dense connective tissue.
The rete testis, contained within the mediastinum, a thickening of the tunica albugina & lined from low cuboidal to simple squamous epithelium. From the rete testis extend ductuli efferents, they have epithelium composed of a group nonciliated cuboidal cells alternating with ciliated cells, in common the type of epithelium lined the efferent duct simple cuboidal ciliated.
· Excretory Genital Duct
The duct transport the spermatozoa produced in the testis toward the penile are the duct, epididymides, vas deferens & the urethra.
The duct epididymis is a single highly coiled tube, with surrounding connective tissue & blood vessels, this long canal forms the body & tail of the epididymis. It is lines with pseudostratified columnar epithelium, these cells are supported by smooth muscle cells whose peristaltic contraction help to move the sperm along the duct.
Their surface is covered by long, branched, irregular microvilli called sterocilia.
· Vas Deferens
A straight tube with thick, muscular wall, continuous toward the prostatic urethra & empties into it. Its mucosa forms longitudinal folds & is covered along most of it extent by pseudostratified columnar with stereocilia. The lamina properia is a layer of connective tissue rich in elastic fibers & thick muscular layer consists of longitudinal inner & outer layer separated by a circular layer.
· Accessory Genital Glands
The accessory glands are the seminal vesicles, prostate, & bulbourethral glands.
· The Seminal Vesicles
Which are not reservoirs for spermatozoa, consist of two highly tortuous tubes 15cm in length, it has a fold mucosa that is lined pseudostratified columnar rich in secretory granules. The lamina properia of the seminal rich in elastic fibers & surrounded by a thin layer of smooth muscle.
· The Prostate
It is a collection of 30-50 branched tubuloalveolar glands whose ducts empty into the prostatic urethra. This gland produce prostatic fluid & stores it in its interior for expulsion during ejaculation. The prostate is surrounded by a fibroelastic capsule rich in smooth muscle. Septa from this capsule penetrate the gland and divided into the lobules that are indistinct in adult men.
The prostate has three distinct zones: the central zone has a pseudostratified epithelium occupies 25% of the gland s volume, 70% of the gland is formed by the peripheral zone, the small spherical bodies of glycoproteins and often calcified are frequently observed in the lumen of prostatic gland. They are called prostatic concretions or corpora amylacae.
· The Bulbourethral Gland (Cowper s Gland)
They are located proximal to the membranous portion of urethra & empty into it. They are tubulo-alveolar lined with simple cuboidal epithelium, skeletal & smooth muscle are present in the septa that divided each gland into lobes. The secreted mucus is clear & acts as a lubricant.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .