Human Anatomy

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Human Anatomy

• The Male Reproductive SystemPart 1

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Objectives- part 1

• Describe the elative placement of the following
  structures how they fit into the pathway of
  sperm delivery
• Testis, epididymus, vas deferens, seminal
  vesicle, ejaculatory duct, prostate,
  bulbourethral gland, urethra, penis
• Describe the mulitple roles of the testis -

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Objectives- part 2

• Describe Cryptorchidism and its treatment
• Describe the role of epididymus
• Explain the importance of testicular placement
  and it role in sperm viability

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Functions of ? Reprod. System

• Production of sex cells (1 sex organ)
• Delivery of sex cells (sperm) to place of
  fertilization
• Production of male sex hormones

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Overview
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Testes (Testis, sng.)

• 1 sex organ
• production of ________________
• Secretion of testosterone
• Suspended within the scrotum
• Scrotum is a pouch of skin with a thin muscular
  wall
• Testes first appear at 7 weeks next to kidneys

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Cryptorchidism

• Failure of one or both _________ to descend into
  the scrotum prior to birth
• 3 of full term males
• 30 of premature males
• Most descend w/in a few weeks after birth
• Sterility occurs if not descended
• Usually removed by puberty -- cancerous

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Testes
scrotal sacs separated
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Scrotum

• Wall comprised of _________ muscle the Dartos
• Cremaster m. (skeletal m.) attached to dermis
• Temperature control of testes
• Sperm development occurs at lt 35C
• Sperm will not develop at body temperature
  (36.8C).

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Testes

• Comprised of hollow tubing seminiferous tubules
• This is where sperm ________________

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Seminiferous Tubule
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Seminiferous Tubules

• Each testis contains 800 seminiferous tubules.
• Each tubule is about 2.5 ft. in length.
• Each testis contains one half mile of tubing.
• Sperm maturation takes about 9 weeks.

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Sperm
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Structure of Sperm

• Sperm cells consist of
• Head containing the nucleus (male DNA)
• Middle piece and neck contains large spiral
  mitochondrion
• ____ corkscrew motion to propel sperm
• Acrosome membrane bound bag of enzymes covering
  head.

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Testosterone Production

• Occurs in ________cells _________ seminiferous
  tubules

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Epididymus

• Located on posterior/superior border of testes
• Acts as recycling center for damaged sperm
• Stores __________for up to 2 months
• Allows sperm to be fully functional --
  capacitation

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Epididymus