hello everyone. !!!!!
plz tell me some detailed information about structure and functions of testis and different parts of it...
if possible then plz provide an image so that I can refer parts given in them while reading....
plz tell !!!!!!!
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Testis are those structures which are in pairs, they're a pair of oval shaped, extreme pinkish coloured primary se.xual organs of reproductive system present in a human male which are having the dimensions or size of 5 centimeters in length, 3 centimeters thick and they're also 2.5 centimeters wide in their width . They weigh about like 12 grams and are angled "obliquely into the scrotal sac". Suspended into a position by a "Cord" or a "Spe.rmatic Cord" through which it's maintained into that straight position and a "Normal position" of course. Each testicular organ is divided into three main testicular coverings NAMELY: Tunica Vaginalis, Tunica Albuginea and Tunica Vasculosa. On each side of testis there contains a Hollow structured covering called Tunica Vaginalis, which's a two or bilayered of peritoneum including a narrow coelomic filled cavity of course having the fluid of coelom for aiding in sliding of testis inside the scrotal sac. Real covering if testis is actually more denser and slightly and/or more blueish in colour and is a white fibrous connective tissue with a sheath called or known as Tunica Albuginea. Tunica Albuginea is projecting towards and inwards to the main organ testis to firmly form a "thick" layered incompletely formed structure which is in a "vertically inclined column" known as "Mediastinum" which've septa in a transverse section.
Septa here does production of approximately 200-300 conically lobluar testicular glands each of then forming a covering of vascular sheathed structures of extreme loose connective tissues called Tunica Vasculosa. Every lobule of it are filled with a connective tissue and one to four of those are convoluted seminiferous tubules. From then about 900-1100 of those yellowish coloured seminiferous tubules are occurring in testicular glands. Each of that tubule is having a length of approximately 70-80 centimeters. In the connective tissue lying in between those seminiferous tubules there are Leydig cells which goes back to a famous German Origin Anatomist Leydig (1821 till death at 1908) or Interstitial cells, these contain yellow pigmentation of granular structures. Leydig or Interstitial Cells (at the year of 1850 given by Leydig) are giant cells polyhedral in shape which are having eccentric nucleus and small content of lipid containing vacuoles. These have the "Function" of secreting testosterone as a hormone and other things like androgens.
Seminiferous tubular structures are closed at one of their ends. They're becoming more straighter or tubuli recti towards or approaching Mediastinum. Tubuli recti are found in a network of irregularly shaped with finely formed channels called as rete testis. Besides that the tunic of connective fibrous tissue, each of the Seminiferous walled tubular structure has a pretty much well defined basal lamina or in simple words "basement membrane" forming the Base of the testicular organ and is made up of very complex germinal layered structure or epithelial layer of Seminiferous tubule or Seminiferous epithelium or epithelia. It again contains two types of cellular formations like, spermatogenic (or primary germ layered cells ..) and non-different supporting or sustentacular cells. Non-different or indifferent cells are giving rise to Sertoli Cells. Spermatogenic cells automatically forming 4 to 8 layers. The cells are fated toward the processes of Spermatogenesis to finally form Spermatozoa. Sertoli cells was named after it's potential discoverer, the Italian Histologist, Enricho Sertoli who was born at the year 1842 and died at 1910. Sertoli cells are some large shaped pyramidal structures or in a shape of columnar polygon or columnar polygonal cells which've their bases resting on the laminal bases or basement membrane and their ends of apical adjustments are more extending inwards lumen of seminiferous tubules. The laterally formed and terminally formed ends are well formed and apprehensively holding the capacity of charging some processes important for growing and maturing spermatocytes and spermatids. Nucleus shape is showing irregularities and those cells are having Follicle Stimulating Hormonal Receptors which are stimulating the sertoli cells to produce spermatogenic substances as their products. Sertoli cells are then often named as "Nursing cells" or "Nurse cells" for showing the power of differentiating the spermatozoa. They're also exhibiting secretions of a special hormone called "inhibin" which act as inhibitors mainly for controlling the excessive release of Follicle stimulating hormones as per their secretion basis.
Septa here does production of approximately 200-300 conically lobluar testicular glands each of then forming a covering of vascular sheathed structures of extreme loose connective tissues called Tunica Vasculosa. Every lobule of it are filled with a connective tissue and one to four of those are convoluted seminiferous tubules. From then about 900-1100 of those yellowish coloured seminiferous tubules are occurring in testicular glands. Each of that tubule is having a length of approximately 70-80 centimeters. In the connective tissue lying in between those seminiferous tubules there are Leydig cells which goes back to a famous German Origin Anatomist Leydig (1821 till death at 1908) or Interstitial cells, these contain yellow pigmentation of granular structures. Leydig or Interstitial Cells (at the year of 1850 given by Leydig) are giant cells polyhedral in shape which are having eccentric nucleus and small content of lipid containing vacuoles. These have the "Function" of secreting testosterone as a hormone and other things like androgens.
Seminiferous tubular structures are closed at one of their ends. They're becoming more straighter or tubuli recti towards or approaching Mediastinum. Tubuli recti are found in a network of irregularly shaped with finely formed channels called as rete testis. Besides that the tunic of connective fibrous tissue, each of the Seminiferous walled tubular structure has a pretty much well defined basal lamina or in simple words "basement membrane" forming the Base of the testicular organ and is made up of very complex germinal layered structure or epithelial layer of Seminiferous tubule or Seminiferous epithelium or epithelia. It again contains two types of cellular formations like, spermatogenic (or primary germ layered cells ..) and non-different supporting or sustentacular cells. Non-different or indifferent cells are giving rise to Sertoli Cells. Spermatogenic cells automatically forming 4 to 8 layers. The cells are fated toward the processes of Spermatogenesis to finally form Spermatozoa. Sertoli cells was named after it's potential discoverer, the Italian Histologist, Enricho Sertoli who was born at the year 1842 and died at 1910. Sertoli cells are some large shaped pyramidal structures or in a shape of columnar polygon or columnar polygonal cells which've their bases resting on the laminal bases or basement membrane and their ends of apical adjustments are more extending inwards lumen of seminiferous tubules. The laterally formed and terminally formed ends are well formed and apprehensively holding the capacity of charging some processes important for growing and maturing spermatocytes and spermatids. Nucleus shape is showing irregularities and those cells are having Follicle Stimulating Hormonal Receptors which are stimulating the sertoli cells to produce spermatogenic substances as their products. Sertoli cells are then often named as "Nursing cells" or "Nurse cells" for showing the power of differentiating the spermatozoa. They're also exhibiting secretions of a special hormone called "inhibin" which act as inhibitors mainly for controlling the excessive release of Follicle stimulating hormones as per their secretion basis.
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