The%20Male%20Reproductive%20System

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The Male Reproductive System

• SHANDONG UNIVERSITY Liu
  Zhiyu

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The Male Reproductive System

• Composion
• Internal genital organs
• Gonad-testes
• The duct of conveying sperms includes
• Accessory glands
• External genital organs

Scrotum Penis
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internal genital organs

• (?)Gonad testis
• Paired, ovoid organs,
• Located in scrotum

1.Shape Superior extremity Inferior
extremity Anterior borfer Posterior border
Medial surface Lateral surface
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1.Shape of the testes
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(?)testis 2. Structure

• tunica albuginea
• mediastinum testis sends numerous fibrous
  septules into the gland, dividing it into 100200
  testicular lobulesthat contain 24 contorted
  seminiferous tubules ? traight seminiferous
  tubules ?rete testis

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contorted seminiferous tubules
straight seminiferous tubules
rete testis
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1.testis 2. Structure

• efferent ducts of testis, 12 15 in number
• Function of epididymis
• Produces sperm
• secrete androgens

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(?) Genital ducts

• 1. Epididymis
• ShapeComma-shaped,
• head of epididymis body of epididymis
• tail of epididymis

PositionLocated on superior extremity and
posterior border of testis
Function the site of accumulation and storage
of sperm
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2. Ductus deferens

• Muscular tube that transports sperm form
  epididymis to ejaculatory duct

• Four part

• Testicular part
• -extends form the tail of epididymis to the
  superior extremity of testis

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2.Ductus deferens

• Spermatic part
• - form superior extremity of testis to the
  superficial inguinal ring,----- where the
  vasectomy is performed

• Inguinal part -extends form superficial to deep
  inguinal rings

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2.Ductus deferens

• Pelvic part -crosses the ureter to reach the
  base of bladder, terminal part dilates,
  -----ampulla ductus deferentis

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Spermatic cord

• Extends from the superior extremity of testis to
  the deep inguinal ring
• spermatic cord comprise

Ductus deferens Testicular artery Pampiniform
plexus of vein Nerves and lymphatic
vessels Vestige of vagina process
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• Spermatic cord
• These structures are enclosed by 3 layers of
  tunic
• internal spermatic fascia
• cremaster
• external spermatic fascia

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• 3.Ejaculatory duct
• Formed by union of distal portion ductus deferens
  and excretory duct of seminal vesicle
• Passes through the upper part of prostate and
  opens into the prostatic part of urethra

ejaculatory duct
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(?) Accessory glands

• 1.Seminal vesicle
• Paired sacculated, coiled glands
• Secrete part of seminal fluid
• Located on posterior surface of bladder, lateral
  to ampulla ductus deferens

seminal vesicle
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2.Prostate

• position
• Lies behind pubic symphysis, between neck of
  bladder and urogenital diaphragm
• Shape
• Chestnut-shaped organ

peostate
Base of prostate Apex of prostate Body of
peostate Anterior surfaces Posterior
surfaces-prostatic sulcus
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2.Prostate

• Contains of five lobes
• Anterior lobe
• Middle lobe
• Posterior lobe
• Right and left lobes

Capsule of protate Sheath of protate
formed by pelvic fascia
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3.Bulbourethral gland

• -two small pea-shaped glands, located in the deep
  transverse muscle of perineum, opens into bulb of
  urethra

bulbourethral gland
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External genital organs

• (?) Scrotum
• Pouch of thin skin lying below the root of the
  penis
• Divided into two haves by septum of scrotum,
  contains testes and epididymis

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External genital organs

• (?) Scrotum
• The wall of the testis consist of skin and
  dartos coat, a connective tissue layer that
  contains many smooth muscle fibers which is
  contineus anteriorly to the scarpas fascia of
  abdomen and posteriorly with Colles fascia of
  perineum

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The coverings of testis and spermatic cord
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(?) Penis

• division
• root
• body
• glans penis

• Consists of
• Cavernous body of penis 2
• Cavernous body of urethra 1

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(?) Penis

• Skin-thin and loose
• Prepuce of penis
• Frenulum of prepuce

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(?) Male urethra

• Three parts
• Prostatic part -lies within the prostate
• Membranous part lies within the urogenital
  diaphragm surround by the sphincter of urethra
• Cavernous part -transverse the all length of
  cavernous body of urethra

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(?) Male urethra

• Posterior urethra
• prostatic part
• membranous part
• Anterior urethra
• cavernous part

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(?) Male urethra

• Three constrictions
• internal urethral orifice
• membranous part
• external orifice of urethra
• Three enlarged parts
• At prostatic part
• At bulb of urethra
• At navicular fossa of urethra

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(?) Male urethra

• Two curvatures
• Subpubic curvature -concave upward
• Prepubic curvature -concave downward

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(?) Male urethra

• Within prostatic part
• Urethral ridge
• Seminal colliculus

Prostatic utricle orifices of the ejaculatory
ducts
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gubernaculum of tastis vagianal process
vagianal ligament tunica vaginalis of tastis

parietal layer visceral layer
vaginal cavity
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ampulla ductus deferentis
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Spermatic part