Male reproductive system / For board exam/Male sex accessory duct

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This article base male reproductive system specially it was designed for students.  
section view of male pelvis showing reproductive system.
The Male Reproductive System
 The male reproductive system is located in the pelvis region (Figure 3.Ia)                
    main male reproductive system are following

 Pair of testes

1: What is the scrotum?
2: write the name all male reproductive system?
3: write the functions of scrotum?

 

 accessory ducts

 glands
 external  genitalia

The testes are situated outside the abdominal cavitywithin a pouch called
scrotum.

Function of scrotum

ØThe scrotum helps in maintaining the low temperatureof the testes
(2 -2.5 C) lower than the normal internal body temperature.
ØIt (lower temperature) is necessary for formation of sperm (spermatogenesis).
Ø Covered testis and protection are the main function of scrotum
Structure of scrotum 

 I          In adults, each testis is oval in shape,  with a length of about 4 to 5 cm and a width of about 2 to 3           cm. The testis is covered by a dense covering.

Internal parts of testis & its functions

    Ø Each testis has about 250 compartments called  testicular-lobules

    >>  Each lobule contains one to three highly coiled seminiferous tubules in witch sperms are                     produced

1 : What is male germ cell(spermatogonia) ?
2 : where is sperms are produced?
3 : Witch types cells are present inside the seminiferous tubule?
4 : write the function of male germ cells & sertoli cells?
5 : what is  interstitial space& write their functions?

 

>>Each seminiferous tubule is lined on its inside by two types of  called
male  germ cell( spermatogonia  and sertoli cells

    Ø The male germ cells undergo meiotic division  finally
             leading to spe-rms  formation, while Sertoli cells
              provide nutrition to the germ cells.
diagrammatic view of male reoroductive system
part of testis is open to show inner details
    Ø The regions outside the seminiferous tubles calle interstitial spaceContains small blood vessels            an  interstitial cells or leydig cells.

     Ø Leyding cells synthesise and secrete testicular hormone  calledandrogens.
0      
  Male sex accessory ducts
·        Rate testis
·        Vasa efferentia
·        Epididymis
·        Vas deferens
 1st ste : Seminiferous tubules of testis open into vasa efferentia through rete testis .
2ndstep: the vasa efferentia leave the testis and open into epididymis  along the posterior surface of each testis.
3rdstep: The epididymis  leads to vas deferens that ascends to the abdomen and open into urethra as the ejaculatory duct(fig b2) .These ducts store and transport the sperms from the testis to the outside through urethra.  
The entire journey of the sperms show below  in a diagram.
Seminiferous tubules  ->>>   vasa efferentia  ->>>> rete testis               
                            Urethra     <<<-Vas deferens   <<<- epididymis         
4thstep :  The urethra originates from the urinary bladder and extends through the penis to its external opening called urethral meatus.

penis view

 

 Penis
o
                The penis is the male external genitalia [Figure  3.la, b]  It is made up  of special tissue that helps           in  erection o the penis to facilitate  insemination .
o               The enlarged end of penis called the glans  penis is covered by a loose fold  Of skin              called  foreskin.

 1: write the name all male accessory glands 
2: what else do these glands secret?

Male accessory glands
Seminal vesicles gland (paired)
Prostate  gland (single)
Bulbourethral gland (paired)
§     The male accessory glands [Figure 3.la, ] include paired seminal vesicles, a prostate and paired bulbourethral glands.
§  Secretions of these glands constitute the seminal plasma  which is rich in fructose , calcium and certain enzymes. The secretions of bulbourethral glands also helps in the lubrication of the penis.   
male reproductive system (fig 3.a)

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