Male Reproductive System

The male reproductive system!!

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The Male Penis

Lies externally beneath the abdomen

Tip is enlarged and covered by the forskin - GLANS PENIS

Made of columns of erectile tissue -

CORPUS SPONGIOSUM

CORPORA CAVERNOSA (X2)

Erectile tissue is made of ENCLOSED VASCULAR SPACES

During Erections (stimulations) Vascular spaces fill with blood.

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Structure of the Testes

Contained within scrotum at 34 degrees

DARLO MUSCLE and CREMASTER MUSCLE contract when cold

Pull Testes in to core of body.

Ovoid structure divided into lobules containing SEMINFEROUS TUBULES

These tubules- NUTURE SPERM-SECRETE FLUID-REMOVE DEBRIS

Lined with cells that produce spermatozoa

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Spermatogenesis and Spermiogenesis

Spermatogenesis

Continous from puberty to senescence

Occurs along semiferous tubules in testes

Spermgonia are immature sperm cells

Miotic Divisions in spermgonia generate Spermatocyte.

Meiotic divisions decrease chromosome number producing Haploid Spermatids

Spermiogenesis

Spermatids lose Cytoplasm and gain Flagella

PRODUCE MATURE SPERM

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Spermatazoon (Structure of a Sperm Cell)

HEAD- Nucleus containing DNA with an enzyme filled vesicle (ACROSOME) at tip

ACROSOME enables sperm to penetrate ovum

Midpiece contains Mitochondria that produce energy for movement

FLAGELLUM- Whip like movements propel sperm

After *********** sperm are viable inside the female for 1-2 days

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Structures facilitating possible fertilization of

CAPACITATION- essential for fertilisation, weakens sperm head membrane

more Calcium enters cell and Flagellum activity is stronger

More Calcium = More enzyme from the Acrosome

EPIDIDYMIS- coiled tube that mature sperm pass through

Smooth muscle pushes spermatozoa in Vas Deferens

VAS DEFERENS- ejects testicular fluid into ejaculatory duct

Smooth muscle contracts and pushes sperm into Urethra

URETHRA- conveys semen and urine to exterior

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