Reproductive System

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Reproductive System

• Male

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Anatomy - Male

• Scrotum holding testis
• Cremaster muscle

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Male Gonad

• Testes
• Tunica albuginea
• 200-300 lobules
• Seminiferous tubules location of sperm
  production ½ mile long per testis!!

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Spermatogenesis

• Takes 5-10 weeks
• Production can be 300 million sperm/day
• Spermatogonia mature to become
• Primary spermatocytes, which undergo Meiosis I to
  become
• Secondary spermatocytes, which undergo Meiosis II
  to become
• Spermatids

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Sperm

• Spermatids mature to become
• Spermatozoa (oon is sing.) which can live for
  48-72 hrs, once ejaculated
• Head
• Nucleus
• Acrosome
• Midpiece
• Mitochondria
• Tail

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Testes

• Straight tubules
• Rete testes
• Interstitial cells Testosterone
• Sperm production
• Sex drive
• Secondary sex characteristics

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Puberty

• Physical signs
• Hormones
• Testosterone Interstitial Cells
• GnRH Gonadotropin Releasing Hormone made by
  hypothalamus stimulates Pituitary gland

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Hormones

• LH ICSH Interstitial Cell stimulating
  hormone, made by Pituitary gland and stimulates
  I.C. to make testosterone
• FSH Follicle Stimulating Hormone, made by
  Pituitary gland and stimulates spermatogenesis
• Inhibin made by testes and inhibits FSH

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Epididymis

• Posterior to testes
• Head
• Body
• Tail
• Place for maturation storage of sperm
• 1 day-30 days

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Ductus (Vas) deferens

• Location
• Transports sperm
• Spermatic cord
• Inguinal canal

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Urethra

• Location function
• Prostatic
• Membranous
• Spongy Penile
• External urethral orifice

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Accessory Sex Glands

• Seminal vesicles
• Prostate
• Bulbourethral (Cowpers) glands
• Semen
• Sperm fluids
• 2.5-5 mls/ejac. 300 million sperm/ejac.

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Penis

• Erectile tissue quite vascular
• Corpus cavernosum
• Dorsolateral penis most vast
• Corpus spongiosum
• Surrounding urethra

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Penis

• Glans penis
• Prepuce

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Sexual responses

• Erection
• Penis enlargement rigidity
• Vascular!! dilation of arterioles
• Mediated by Parasympathetic nerve impulses

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Sexual responses

• Emission
• First portion of male orgasm
• Mediated by sympathetic nerve impulses
• Propels sperm to the urethra
• Release of fluid from accessory sex glands

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Sexual responses

• Ejaculation
• Contractions resulting in release of SEMEN from
  urethra