Male Genital System PDF

 The genital system of the male is divided into  external genitalia  internal genitalia  external genitalia Penis Scrotum Testis Epididymis Vas Deferens  internal genitalia Seminal Vesicles Ejaculatory Ducts Prostate  Penis  The penis has a fixed root and a body Root o...

 The genital system of the male is divided into  external genitalia  internal genitalia  external genitalia Penis Scrotum Testis Epididymis Vas Deferens  internal genitalia Seminal Vesicles Ejaculatory Ducts Prostate  Penis  The penis has a fixed root and a body Root of the Penis  The root of the penis is made up of three masses of erectile tissue  bulb of the penis  the right and left crura  The bulb is situated in the midline  Each crus is attached to the side of the pubic arch.  The bulb is continued forward into the body of the penis  The two crura come to lie side by side in the dorsal part of the body  Body of the Penis  The body of the penis is composed of three cylinders of erectile tissue  The erectile tissue is made up of  corpora cavernosa  corpus spongiosum  the corpus spongiosum expands to form the glans penis.  Scrotum  is an outpouching of the lower part of the anterior abdominal wall.  It contains  the testes  the epididymides  the lower ends of the spermatic cords  The wall of the scrotum has the following layers:  Skin.  Superficial fascia:  Spermatic fasciae  Tunica vaginalis  Testis  The testis is a firm, mobile organ  lying within the scrotum.  is surrounded by a tough fibrous capsule, the tunica albuginea.  from the inner surface of the capsule xtending i a series of fibrous septa that divide the interior of the organ into lobules. Lying within each lobule are one to three coiled seminiferous tubules.  Epididymis  is a firm structure lying posterior to the testis.  It has head, a body, and tail inferiorly.  The epididymis is coiled tube nearly 20 ft (6 m) long  A main function of the epididymis is the absorption of fluid.  Another function may be the addition of substances to the seminal fluid to nourish the maturing sperm.  Vas Deferens  is a thick-walled tube about 18 in. (45 cm) long that It arises from the lower end or tail of the epididymis and passes through the inguinal canal.  It emerges from the deep inguinal ring The terminal part of the vas deferens is dilated to form the ampulla of the vas deferens.  The inferior end of the ampulla narrows down and joins the duct of the seminal vesicle to form the ejaculatory duct  Seminal Vesicles  are two lobulated organs about 2 in. (5 cm) long lying on the posterior surface of the bladder  On the medial side of each vesicle lies the terminal part of the vas deferens. Posteriorly, the seminal vesicles are related to the rectum  Inferiorly, each seminal vesicle narrows and joins the vas deferens of the same side to form the ejaculatory duct.  consists of a much-coiled tube embedded in connective tissue.  Ejaculatory Ducts  less than 1 in. (2.5 cm) long formed by the union of the vas deferens and the duct of the seminal vesicle.  pierce the posterior surface of the prostate and open into the prostatic part of the urethra, their function is to drain the seminal fluid into the prostatic urethra.  Prostate  is a fibromuscular glandular organ It is about 1.25 in. (3 cm) long lies between the neck of the bladder above and the urogenital diaphragm below  The prostate is surrounded by a fibrous capsule.  The two ejaculatory ducts pierce the upper part of the posterior surface of the prostate  Function of the Prostate  The prostate produces a thin, milky fluid containing citric acid and acid phosphatase that is added to the seminal fluid at the time of ejaculation.  The prostatic secretion is alkaline and helps neutralize the acidity in the vagina.  Urinary Bladder  The urinary bladder is situated immediately behind the pubic bones  The bladder has a strong muscular wall.  The empty bladder is pyramidal ,having an apex, a base, and a superior and two inferolateral surfaces; it also has a neck.