By

Dr Samina Anjum

Male reproductive system

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Internal structure of testis

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The reproductive system of the male

Two major functions:

Production of sperm

To provide safe passage for spermatozoa

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Migration of primordial germ cells

(PGCs)

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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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At Puberty

Sex cords acquire

lumen & become

seminiferous tubules

PMGs give rise to

spermatogonial stem

cells

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SPERMATOGENESIS

Begins at puberty

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

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PHASES OF SPERMATOGENESIS

• Spermatogonial Phase (Mitosis)

• Spermatocyte Phase/Spermatocytosis

(Meiosis)

• Spermatid Phase (Spermiogenesis)

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PHASE I-Spermatogonial Phase

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PHASE II-SPERMATOCYTOSIS

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Spermatids

PHASE II- MEOSIS

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Prophase-22 days

Largest cell

PHASE III-(SPERMIOGENESIS)

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SPERMATOGENESIS

Cytokinesis is incomplete

Sp

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Sp

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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

Mature Human Spermatozoa

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Entire process of spermatogenesis takes approx. 74 days

Approx. 300 millions sperms are daily produced.

Sertoli cells

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•Support

•Protect

•Nutrition

•Phagocytosis

•Regulate

spermatogenesis

Phagocytosis

of cytoplasm

by the Sertoli

cells.

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Epididymis

Storage

Acquire motility

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Hormonal Regulation Of Male Reproductive

Function

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THANK YOU

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