Male Genital

8/8/2019 Male Genital

1/36

Chapter 5 The Genital System

The genital system(reproductive)

male genital organs

female genital organs

Functionbreeding descendent

secreting hormones


2/36

Section 1 The Male Genital Organs

The malegenital

organs

internal

genital

organs

external

genital

organs

gonad---- the testes

conveying ducts

---- epididymis

ductus deferens

ejaculatory ducts

urethra

accessory glands

---- seminal vesicles

prostate gland

bulbourethral glands

---- scrotums

penis


3/36

I) The Testes

The testes are the gonads of the male. They are

suspended in the scrotum by the spermatic cord.

I. The Internal Genital Organs

Each testis has the

superior and inferior

extremities, the lateral

and medial surfaces,

and the anterior andposterior borders.


4/36

the tunica albuginea the mediastinum testis

a series of lobules of testisthe septula testis


5/36

The convoluted seminiferous tubulesproduce the

sperms the straight seminiferous tubules the

rete testis the efferent ductules of testis12~15

the epididymis.


6/36

The cells between the convoluted seminiferous

tubulesthe interstitial cellscan produce the

male hormone------testosterone.


7/36

In the early fetal life, the

testes are contained in the

abdominal cavity behind

the peritoneum. About 2

months prior to the birth

they descend into the

scrotum through the

inguinal canal.

The cryptorchidism


8/36

II) The Epididymis

It is a comma-shaped and attaches to the superior

extremity and the posterolateral surface of the testis.

It can be divided into the head, the body and the tail.


9/36

Functionally, the epididymis is the principal

storing-house for sperms. It also adds an essential

secretion to the seminal fluid in which the sperms

are developed and activated.


10/36

III) The Ductus Deferens

It is the continuation of the duct of epididymis.

According to its course, it is divided into four parts:

1. The testicular part (the shortest part)


11/36

2. The funicular (spermatic) part

(superficial, the vasectomy is

performed at here)

3. The inguinal part

4. The pelvic part (the Longest

part)


12/36

The dilated terminal portion of the ductus

deferens is called the ampulla ductus deferentis

descending behind the fundus of the bladder. Its

end is thin and joins the excretory duct of

seminal vesicle to form the ejaculatory duct.


13/36

The Spermatic Cord

When the testis descends through the abdominal

wall into the scrotum, it carries its vessels, nerves and

ductus deferens to form the spermatic cord. It

extends from superior extremity of the testis to the

deep inguinal ring.


14/36

The main structures of spermatic cord are the

ductus deferens, testicular artery, pampiniform

plexus of vein, nervous plexus, lymphatic vessels

and the vestige of vaginal process. They are

enclosed in three tunics derived from the anterior

abdominal wall.


15/36

IV) The Ejaculatory Duct

It is formed by the union of the terminal part of the

ductus deferens and the excretory duct of seminal

vesicle. It commences at the base of prostate, open into

the prostatic portion of the urethra.


16/36

V) The Seminal Vesicles

They are two oval

sacculated organs. Each

seminal vesicle is composed

of coiled blind duct.

Its excretory duct is thin

and joins the corresponding

ductus deferens to form the

ejaculatory duct.

The secretion of the seminal

vesicles is a component ofseminal fluid.


17/36

VI) The Prostate

It is a single, firm gland

consisting of muscular and

glandular tissues. Its

secretion, the important

component of the seminal

fluid, is conveyed into the

prostatic portion of urethra

through 16~32 excretory

ducts.


18/36

The prostate lies in the lesser pelvic cavity,

below the urinary bladder and around the

superior part of the urethra.The apex ; The base

The urethra passes through the prostate.


19/36

The anterior surface

The posterior surface ----

prostatic sulcus

This sulcus, ampulla ductus

deferentis and seminal vesicles

can be touched through the

anterior wall of the rectum in

the living body.


20/36

The prostate may be divided into five lobes:

anterior, median (isthmus of prostate),

posterior and two lateral lobes.


21/36

VII) The Bulbourethra1 Glands (of Cowper)

They are about the size of pea, one on each side of

the membranous part of urethra. Their excretory

ducts open into the upper part of the spongy part of

urethra.


22/36

The seminal fluid is the mixture of thesperms and secretion of accessory glands. It is

white milk like fluid, with weak alkalinity. In

every ejaculation about 2~5ml of seminal fluidis expelled, which contains 300~500 million of

sperms per milliliter.

The seminal fluid


23/36

I) The ScrotumIt is a pendulous pouch of skin and superficial

fascia evaginated from the lower part of the

abdominal wall.

the dartos ; the septum of scrotum

II. The External Genital Organs


24/36

Beneath the dartos there are three layers of

tunics to enclose the testis and spermatic cord.


25/36

II) The Penis

It is the male organ of copulation and urination. It

comprises a root, a body, a neck and a head.the glans penis

the prepuce

the orifice of prepuce


26/36

The prepuce in the child is longer than that in the

adult.

The frenulum of prepuce

Clinical deseases: redundant prepuce ; phimosis

prophylactic circumcision,


27/36

The penis is composed of three cavernous bodies.

The two dorsally cavernous body of penis and the

single smaller ventral cavernous body of urethra,

contains the spongy part of the urethra.

the glans penis;

the bulb of urethra

(penis)


28/36

These three cavernous bodies can become turgid

with blood when the sexual excitement. The penis

thus becomes stiff and erect, the blood being held inthe erectile tissues by compression of deep veins.

After ejaculation or as sexual excitement subside,

the penis becomes flaccid again.


29/36

Each erectile mass is enclosed with the

albugineous coat. The superficial, deep fascia of

penis and skin cover the three erectile masses all

together.


30/36

III) The Male Urethra

It extends from the internal orifice of urethra in

the urinary bladder to external orifice at the end ofthe penis. It is 17~20cm long and may be divided into

three parts:

1.The prostatic part: urethral crest,

the opening of ejaculatory duct

and the prostatic ductules.


31/36

2.The membranous part

It is the shortest, narrowest part of the

urethra. It is within the urogenital diaphragm,

and surrounded by the sphincter of urethra.


32/36

3.The cavernous (spongy) part

It is contained in the cavernous body of urethra,

In this part there are two dilated places, the

bulbous portion of urethra and the navicullar fossa.


33/36

The male urethra presents

three strictures, three

dilations, two curvatures.The three strictures are

situated in, the internal

urethral orifice, the

membranous portion and

the external orifice of

urethra.


34/36

Three dilations are situated in

the prostatic part, the bulbous

portion of urethra, the navicullar

fossa. When the penis is flaccid,

the urethra has two curvatures,

the subpubic curvature and theprepubic curvature.


35/36

Summarize:

The sperms are produced by the testes, then

through the epididymis the ductus deferens

the ejaculatory duct the urethra

out of the body


36/36

Review

1. What is the composition of the male genital organs?

2. What is the conveying course of the sperms whenthey produced by the testes?

3. How many parts is the ductus deferens divided into?

What are they? Please write down the place wherethe vasectomy is performed.

4. Please write down the position of the prostate.

5. Please write down the composition of the spermaticcord.

6. What are three parts, three strictures, three

dilations, two curvatures of the male urethra?

Date post:	29-May-2018
Category:	Documents
Upload:	somebodyma
View:	221 times
Download:	0 times

Male Genital

Documents