28 Difference Between Spermatogenesis and Spermiogenesis in human cells.

Spermatogenesis

  • Spermatogenesis is the process of the formation of haploid sperms from a diploid stem cell known as spermatogonium.
  • The process occurs inside the seminiferous tubules in the testis.
  • The entire process takes about 70 days.
  • Spermatogenic germ cells are called spermatogonia.
  • Spermatogonia are stem cells that are capable of self-renewing.
  • They differentiate into intermediate spermatogonium, which is committed to differentiating into spermatozoa.

Oogenesis

  • Oogenesis is the process of formation of the ovum.
  • The process occurs in the ovaries of the female.
  • One oogonium produces a single ovum.
  • Primary oocyte is the diploid cell, which is divided by meiosis, forming a single ovum.
  • Oogenic germ cells are called oogonia, which are stem cells, self-renewing and differentiating into ova.

Difference Between Spermatogenesis and Spermiogenesis

PropertiesSpermatogenesisOogenesis
DefinitionThe production of sperms from spermatogonia is called spermatogenesis.The production of eggs from oogonia is called oogenesis.
OogenesisOccurs in maleOccurs in female
Growth phaseToo shortProlonged
FormationSeminiferous tubules of testisIn ovaries
ProcessProduction of sperms from spermatogoniaProduction of ovum from oogonia
Cell DivisionAll spermatogonia are divided by meiosis, producing sperms all the times.Some of the oogonia divide during the production of eggs, one at a time.
ContinuitySpermatogenesis is a continuous process, occurring after the puberty till death.Early stages of the oogenesis occurs during the fetal period. The rest of the process occurs after the puberty. Only one ovum is produced per month until menopause.
Production of ovum from oogoniaContinuous, occurs after the puberty till deathDiscontinuous, occurs after the puberty until menopause
Nuclear condensationFoundAbsent
Sertoli cells Sertoli cells are found in the germinal cell epithelium, supporting the germinal cells. No Sertoli cells are found in the germinal cell epithelium.
Food reserveSperm contains less food reserveOvum contain a lot of food reserve
StagesAll stages occurs inside the testisExcept the last stage which occurs in oviduct, all stages occurs inside the ovary
germ line epitheliumInvolved in gamete productionNot involved
LocationOccurs entirely in testes Occurs mostly in ovaries
Meiotic DivisionEqual division of cellsUnequal division of cytoplasm
Primary GametocytePrimary spermatocyte is divided by meiosis 1, forming two secondary spermatocytes.Primary oocyte is divided by meiosis 1, forming a secondary oocyte and one polar body.
Secondary GametocyteSecondary spermatocyte is divided by meiosis 2, forming two spermatids.Secondary oocyte is divided by meiosis 2, forming ovum and one polar body.
CytokinesisEqualUnequal
Number of gametes produced4 1 (plus 2 -3 polar bodies)
Size of gametesSperm smaller than spermatocytesOva larger than oocytes
DurationUninterrupted processIn arrested process
Onsetbeings at puberty Begins in foetus (pre-natal)
ReleasecontinuousMonthly from puberty (menstrual cycle)
Initiation of processBegins at puberty Begins even before birth
MotilitySperm are motileOvum is immotile
Starting cellsStart from a primary spermatocyte Start from a primary oocyte
ResultForms four motile male gametes i.e. spermsForms one non-motile female gamete i.e. ovum
ReleasingSperms are released from the testisOocytes are released from the ovary which matures later

References

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