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By Dr Samina Anjum

Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

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Page 1: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

By

Dr Samina Anjum

Page 2: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Male reproductive system

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Page 3: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

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Page 4: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Internal structure of testis

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Page 5: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

The reproductive system of the male

Two major functions:

Production of sperm

To provide safe passage for spermatozoa

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Page 6: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Migration of primordial germ cells

(PGCs)

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Page 7: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

At Birth

PGCs are present in sex cords of testis as large pale cells surrounded by supporting cells

If PGCs cells – Y chromosome (SRY gene)

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Page 8: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

At Puberty

Sex cords acquire

lumen & become

seminiferous tubules

PMGs give rise to

spermatogonial stem

cells

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Page 9: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

SPERMATOGENESIS

Begins at puberty

Is the sequence of events by which spermatogonia are transformed into spermatozoa.

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Page 10: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

PHASES OF SPERMATOGENESIS

• Spermatogonial Phase (Mitosis)

• Spermatocyte Phase/Spermatocytosis

(Meiosis)

• Spermatid Phase (Spermiogenesis)

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Page 11: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

PHASE I-Spermatogonial Phase

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Page 12: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

PHASE II-SPERMATOCYTOSIS

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Spermatids

Page 13: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

PHASE II- MEOSIS

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Prophase-22 days

Largest cell

Page 14: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

PHASE III-(SPERMIOGENESIS)

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Page 15: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

SPERMATOGENESIS

Cytokinesis is incomplete

Sp

erm

ato

go

nia

l

Ph

as

eS

perm

ato

cyte

ph

ase

Sp

erm

iog

en

esis

ph

ase

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SPERMIOGENESISThe series of changes resulting in the transformation of Spermatids into

spermatozoa

Formation of acrosome

Condensation of nucleus

Formation of neck, middle piece & tail

Shedding of most of the cytoplasm

Page 17: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Mature Human Spermatozoa

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Entire process of spermatogenesis takes approx. 74 days

Approx. 300 millions sperms are daily produced.

Page 18: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Sertoli cells

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•Support

•Protect

•Nutrition

•Phagocytosis

•Regulate

spermatogenesis

Page 19: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Phagocytosis

of cytoplasm

by the Sertoli

cells.

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Page 20: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Epididymis

Storage

Acquire motility

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Page 21: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

Hormonal Regulation Of Male Reproductive

Function

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Page 23: Male reproductive systemrihsbds.weebly.com/uploads/1/1/8/7/11876508/3-spermatogenesis.pdfThe reproductive system of the male Two major functions: Production ofsperm To provide safe

THANK YOU

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