Male reproductive system Anatomy and physiology

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Male reproductive system Anatomy and physiology

• Kristina Njerš
• Mentor A. Žmegac Horvat

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Male reproducitve system,anatomy(MRSA)
Seminal vesicle
Prostate gland
Bulbourethral (Cowpers) gland
Ejaculatory duct
Vas (ductus) deferens
Urethra
Epididymis
Testis, Scrotum
Penis
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Functions of the MRS

• 1. Production, retention and transport of
  semen
• 2. Production and secretion of testosterone
• 3. Ejaculation - sperm discharge
  during intercourse

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• Testis - in scrotum (27 degrees C)
• -seminiferous tubules -
  germ cells - spermatogenesis
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  -Sertoli cells
• -interstitial cells -
  Leydig cells - testosterone

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Spermatogenesis (3 major parts)

• mitosis- the multiplication of spermatogonia
• meiosis- reduction of chromosome number from
  diploid to haploid
• spermiogenesis -transformation of spermatid into
  the spermatozoon
• Spermatozoa or sperms are first produced at
  puberty,
• spermatogenic activity is maintained into old age

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Spermatozoon(sperm cell)
The tail Mitochondria - motility
The head Acrosome - enzyme activity
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Sertoli cells

• secretory and structural support to the germ
  cells
• (spermatogenesis)
• create a blood-testis barrier

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Endocrinology of male reproduction
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• Epididymis - upon lateral edge of posterior
  border of the testis
• - caput, corpus, cauda
• - spermatozoa conduit and
  reservoir
• - spematozoon gets motilily
  and fertilizing capacity
• Vas deferens - in the spermatic cord
• - scrotal, inguinal,
  retroperitoneal portions
• - peristaltic contractions
  during ejaculation
• Spermatic cord - connective tissue sheath
• - contains - ductus deferens,
• - testicular
  blood vessels
• - nerves

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Seminal vesicles - posterior to the urinary
bladder - alkaline secretion -
enhances spermatozoic mobility
- energy source (fructose)
- most of the volume of ejaculated semen
Ejaculatory duct - ductus deferens seminal
vesicle duct Prostate gland - encircles upper
end of urethra - muscular gland
- smooth muscle contracts during ejaculation -
secretion - helps motlity of sperm Bulbourethral
glands (Cowpers) - below the prostate
- secretion - empty into
urethra

• Semen-combination of fluid and spermatozoa (lt1)

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Penis

• - root
• - body
• - 3 circular-shaped chambers
• - sponge-like erectile tissue
• - vascular sinuses
• - vasodilatation - erection
• - glans penis
• - foreskin (prepuce)
• - circumcision
• - nerve endings

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Thank you! ?